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OISHI Satoru
Research Center for Urban Safety and Security
Professor

Researcher basic information

■ Research Keyword
  • digital twin for disaster prevention
  • Simulation for Damage Estimation
  • Radar
  • Hydrometeorology
  • Disaster Mitigation
■ Research Areas
  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Hydroengineering
  • Natural sciences / Atmospheric and hydrospheric science

Research activity information

■ Paper
  • Kazuki Yamanoi, Satoru Oishi, Kenji Kawaike
    ABSTRACT Debris‐flow affected area is typically predicted using runout simulations, often estimating the hydrograph from rainfall conditions. However, rainfall is rarely considered when predicting initiation locations, which influence the occurrence number and location. This study proposes a hybrid method combining statistical source‐location prediction based on rainfall conditions and runout simulations inputting the predicted source locations. First, logistic regression is used to predict the spatial probability of debris‐flow initiation with rainfall as an input. Next, Monte Carlo simulation based on the initiation location generated from the rainfall‐based probability yields the spatial distribution of the debris‐flow hit probability. Simulation parameters are systematically determined in advance based on topographic change obtained via aerial LiDAR observations. This method was successfully employed to estimate the spatial distribution of the debris‐flow hit probability at 1‐m resolution for a debris‐flow disaster that occurred in Hiroshima prefecture, Japan, using rainfall data obtained by radar. The simulation time indicated that hit probability can be issued prior to the event for early warning, owing to the adequate lead time of rainfall forecasts and recent developments in computational technology. The hit probability obtained in this study can be also applied to risk quantification based on rainfall conditions.
    Wiley, Feb. 2025, Journal of Flood Risk Management, 18(1) (1), English
    [Refereed]
    Scientific journal

  • Bruno Adriano, Naoto Yokoya, Kazuki Yamanoi, Satoru Oishi
    IEEE, Jul. 2023, IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 1154 - 1157, English
    [Refereed]
    International conference proceedings

  • Ng P.Y, Tan K.W, Oishi S, Huang Y.F

    <p>For decades, climate models have been used to understand the present and historical climates, especially global climate models (GCMs). They are used to understand the interaction between climate system processes and forecast future climates. However, the issue of low resolution and accuracy often lead to inadequacy in capturing the variations in climate variables related to impact assessment. In order to capture the local climate changes in Hyogo Prefecture of Western Japan, a local climate modelling based on Second Generation Canadian Earth System Model (CanESM2) was applied using the statistical downscaling technique. Representative Concentration Pathway (RCP) 4.5 and 8.5 scenario were used in generating future climate models. The reliability of models was tested with Linear Regression, Pearson correlation, and Cronbach Alpha. Moderate relationship between rainfall data and both RCP scenarios was found in all chosen stations. Spatial analysis outcome showed that there is a possibility of increase in annual rainfall in Hyogo prefecture, where the increase is significant in Northern region. There is a possibility of increase in maximum and minimum temperature in four selected stations due to the increase of greenhouse gas emissions.</p>

    University of the Aegean, Feb. 2023, Global NEST: the international Journal, 25(5) (5), 136 - 146
    [Refereed]
    Scientific journal

  • Okazaki, M., Oishi, S., Awata, Y., Yanase, T., Takemi, T.
    2023, Atmospheric Science Letters, 24(6) (6)
    [Refereed]
    Scientific journal

  • Magfira Syarifuddin, Susanna F. Jenkins, Benoit Taisne, Satoru Oishi, Ahmad Basuki, Masato Iguchi
    Apr. 2022, Journal of Volcanology and Geothermal Research, 424
    [Refereed]
    Scientific journal

  • Predicting Flood Inundation Depth Based-on Machine Learning and Numerical Simulation
    Bruno Adriano, Naoto Yokoya, Kazuki Yamanoi, Satoru Oishi
    2022, CEUR Workshop Proceedings, 3207, 58 - 64
    International conference proceedings
    Link to Kobe Univ. Repository (Kernel)

  • Naoto Yokoya, Kazuki Yamanoi, Wei He, Gerald Baier, Bruno Adriano, Hiroyuki Miura, Satoru Oishi
    2022, IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 60, English
    [Refereed]
    Scientific journal

  • Tomohide Takeyama, Hideyuki O-Tani, Satoru Oishi, Muneo Hori, Atsushi Iizuka
    Dec. 2021, IEEE-ASME TRANSACTIONS ON MECHATRONICS, 26(6) (6), 2881 - 2887, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Kazuki Yamanoi, Satoru Oishi, Kenji Kawaike, Hajime Nakagawa
    Nov. 2021, JOURNAL OF FLOOD RISK MANAGEMENT, English
    [Refereed]
    Scientific journal

  • Jian Chen, Hideyuki O-tani, Tomohide Takeyama, Satoru Oishi, Muneo Hori
    Oct. 2021, JOURNAL OF EARTH SCIENCE, 32(5) (5), 1129 - 1138, English
    [Refereed]
    Scientific journal

  • Magfira Syarifuddin, Satoru Oishi, Haruhisa Nakamichi, Masayuki Maki, Ratih Indri Hapsari, Hanggar Ganara Mawandha, Nurnaning Aisyah, Ahmad Basuki, Agoes Loeqman, Makoto Shimomura, Masato Iguchi
    Elsevier BV, Nov. 2020, Journal of Volcanology and Geothermal Research, 405, 107040 - 107040
    [Refereed]
    Scientific journal

  • Magfira Syarifuddin, Ratih Indri Hapsari, Djoko Legono, Satoru Oishi, Hanggar Ganara Mawanda, Nurnaning Aisyah, Makoto Shimomura, Haruhisa Nakamichi, Masato Iguchi
    Feb. 2020, IOP Conference Series: Earth and Environmental Science, 437(1) (1)
    [Refereed]
    International conference proceedings

  • Ratih Indri Hapsari, Bima Ahida Indaka Sugan, Dandung Novianto, Rosa Andrie Asmara, Satoru Oishi
    Feb. 2020, IOP Conference Series: Earth and Environmental Science, 437(1) (1)
    [Refereed]
    International conference proceedings

  • Hapsari, R.I., Sugna, B.A.I., Novianto, D., Asmara, R.A., Oishi, S.
    Last, 2020, International Journal of Disaster Risk Science, 11(6) (6), English
    [Refereed]
    Scientific journal

  • Performance of a small-compact X-MP radar to monitor extreme rainfall event on 7 July 2018
    Magfira Syarifuddin, Mariko Ogawa, Haruhisa Nakamichi, Satoru Oishi, Masato Iguchi
    2020, 22nd Congress of the International Association for Hydro-Environment Engineering and Research-Asia Pacific Division, IAHR-APD 2020: "Creating Resilience to Water-Related Challenges"
    International conference proceedings

  • Jian Chen, Tomohide Takeyama, Hideyuki O-tani, Kazuki Yamanoi, Satoru Oishi, Muneo Hori
    Jan. 2020, Computers and Geotechnics, 117
    [Refereed]
    Scientific journal

  • ビデオゾンデを用いた鉛直風速プロファイルの算出と雲物理的解析
    大石哲・林直希・小川まり子・梶川義幸・中北英一
    Lead, Nov. 2019, 土木学会論文集, Ser. B1(水工学), Vol.75, No.2, I_1177-I_1182, 2019., 75(2) (2), I_1177 - I_1182, Japanese
    [Refereed]

  • INVESTIGATION OF MULTIPARAMETER RADAR ERROR STRUCTURE FOR QPE BASED ON GPM DUAL-FREQUENCY PRECIPITATION RADAR
    Hanggar G. MAWANDHA, Satoru OISHI
    Last, Nov. 2019, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), Vol.75, No.2, I_1165-I_1170, 2019, 75(2) (2), I_1165 - I_1170, English
    [Refereed]
    Scientific journal

  • Jian Chen, Hideyuki O-tani, Tomohide Takeyama, Satoru Oishi, Muneo Hori
    Aug. 2019, Engineering Geology, 258(14) (14), English
    [Refereed]
    Scientific journal

  • Ratih Indri Hapsari, Satoru Oishi, Magfira Syarifuddin, Rosa Andrie Asmara, Djoko Legono
    Aug. 2019, Journal of Disaster Research, 14(5) (5), 811 - 828
    [Refereed]
    Scientific journal

  • Ratih Indri Hapsari, Masahiro Iida, Masahide Muranishi, Mariko Ogawa, Magfira Syarifuddin, Masato Iguchi, Satoru Oishi
    Feb. 2019, Journal of Disaster Research, 14(1) (1), 151 - 159
    [Refereed]
    Scientific journal

  • Chen Jian, Takeyama Tomohide, O-tani Hideyuki, Yamanoi Kazuki, Oishi Satoru, Hori Muneo

    A lack of analytical benchmark solution makes it difficult to verify soil dynamics simulations of nonlinear geotechnical problems. This study makes use of a novel code verification technique, the method of numerically manufactured solutions (MNMS), to overcome such difficulty. Using MNMS, the accuracy of a nonlinear soil dynamics simulation code based on finite element method (FEM) is verified. The orders of the convergence rate of the relative errors with respect to the discretization size are found to be in good agreement with the theoretical values prescribed by the numerical methods.

    National Committee for IUTAM, 2019, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 65, 233 - 233, Japanese

  • Magfira Syarifuddin, Satoru Oishi, Ratih Indri Hapsari, Jiro Shiokawa, Hanggar Ganara Mawandha, Masato Iguchi
    2019, Journal of Disaster Research, 14(1) (1), 135 - 150
    [Refereed]
    Scientific journal

  • Roby Hambali, Djoko Legono, Rachmad Jayadi, Satoru Oishi
    2019, Journal of Disaster Research, 14(1) (1), 69 - 79
    [Refereed]
    Scientific journal

  • 火山噴出物の放出に伴う災害の軽減に関する総合的研究
    井口正人, 中道治久, 中田節也, 宮本邦明, 大石 哲, 藤田正治
    Oct. 2018, 京都大学防災研究所年報, 61(A) (A), 5 - 23, Japanese
    [Invited]
    Research institution

  • Özgen Ilhan, Martin Bruwier, Jiaheng Zhao, Dongfang Liang, Pierre Archambeau, Benjamin Dewals, Kenichiro Kobayashi, Satoru Oishi, Reinhard Hinkelmann
    Sep. 2018, E3S Web of Conferences, 40
    [Refereed]
    International conference proceedings

  • Finn Amann, Ilhan Özgen, Morgan Abily, Jiaheng Zhao, Dongfang Liang, Kenichiro Kobayashi, Satoru Oishi, Philippe Gourbesville, Reinhard Hinkelmann
    Sep. 2018, E3S Web of Conferences, 40
    [Refereed]
    International conference proceedings

  • Effects of spatio-temporal variations of gauges and radar rainfall observations on runoff simulation
    Ratih Indri Hapsari, Satoru Oishi, Magfira Syarifuddin, Winda Harsanti, Fahmi Hidayat
    Sep. 2018, Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018, 2, 1285 - 1293
    [Refereed]
    International conference proceedings

  • Statistical properties of short-term rainfall time series as observed by XMP radar (Case of Mt. Merapi area)
    Roby Hambali, Djoko Legono, Rachmad Jayadi, Satoru Oishi
    Sep. 2018, Proceedings - International Association for Hydro-Environment Engineering and Research (IAHR)-Asia Pacific Division (APD) Congress: Multi-Perspective Water for Sustainable Development, IAHR-APD 2018, 2, 1317 - 1324
    [Refereed]
    International conference proceedings

  • Ogawa Mariko, Oishi Satoru
    神戸大学都市安全研究センター, Mar. 2018, 神戸大学都市安全研究センター研究報告, 22, 75 - 87, Japanese
    Link to Kobe Univ. Repository (Kernel)

  • 単一のXバンドMPレーダーとCバンドレーダーを活用した山地域における土砂災害危険度推定
    渡邊彩花, 相馬一義, 大石哲, 佐野哲也, 柿澤一弘, 馬籠純, 石平博, 市川温, 末次忠司, 砂田憲吾
    2018, 自然災害科学, 37(3) (3), 295 - 311, Japanese
    [Refereed]
    Scientific journal

  • YAMANOI Kazuki, O-TANI Hideyuki, CHEN Jian, OISHI Satoru, HORI Muneo

     Estimation of a damage of sediment-related disaster accompanied with flood, inundation, and sediment supply due to landslides is important to establish a prevention plan and/or evaluate the risk of them. In this study, we have developed a 2D Distributed Rainfall and Sediment Runoff/Inundation Simulator (:DRSRIS) with coupling the 2d rainfall runoff model, inundation flow model, and sediment transport model on the staggered grid which performs on the supercomputer. The model was applied to Haki area, Fukuoka Pref., Japan, where the Kyu-shu heavy rainfall in 2017 took place based on the sediment supply distribution estimated from the actual landslide data. The calculated sediment transport volume was underestimated, however, the calculated results almost corresponded to the inundated area obtained from the survey.

    Japan Society of Civil Engineers, 2018, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 74(5) (5), I_889 - I_894, Japanese
    [Refereed]
    Scientific journal

  • A STUDY ON COLLECTION EFFICIENCY OF RAINDROPS CAPTURED BY VIDEOSONDES IN CLOUDS
    OGAWA Mariko, OISHI Satoru, SUZUKI Kenji, NAKAGAWA Katsuhiro, YAMAGUCHI Kosei, NAKAKITA Eiichi
    2018, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), 74(4) (4), Japanese
    [Refereed]
    Scientific journal

  • SPATIOTEMPORALDISTRIBUTION OF RAINFALL IN MOUNT SAKURAJIMA BASED ON WEATHER RADAR
    SYARIFUDDIN Magfira, OISHI Satoru, NAKAMICHI Haruhisa, IGUCHI Masato
    2018, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), 74(4) (4), English
    [Refereed]
    Scientific journal

  • REAL-TIME RADAR QUANTITATIVE PRECIPITATION ESTIMATION USING MULTIVARIATE PROJECTION MODEL
    MAWANDHA Hanggar Ganara, OISHI Satoru
    2018, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), 74(4) (4), English
    [Refereed]
    Scientific journal

  • Tetsuya Sano, Satoru Oishi
    2018, Journal of the Meteorological Society of Japan, 96A(A) (A), 95 - 117, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • EMPIRICAL MODEL FOR REMOTE MONITORING OF RAIN-TRIGGERED LAHAR IN MOUNT MERAPI
    Magfira Syarifuddin, Satoru Oishi, Ratih Indri Hapsari, Djoko Legono
    2018, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), 74(4) (4), I_1483 - I_1488, English
    [Refereed]
    Scientific journal

  • CHEN Jian, HORI Muneo, O-TANI Hideyuki, OISHI Satoru
    This paper presents an improvement of a mathematical interpretation of moving particle semi-implicit (MPS) method. The mathematical interpretation leads to a mathematical reformulation of MPS (MRMPS) based on Taylor expansions. The improvement of MRMPS in this paper is featured by solving a system of 9 × 9 (or 5 × 5 for two dimensional settings) equations for the gradient vector and for all the components of the Hessian matrix. Numerical experiments with various types of target functions showed that the improved MRMPS possesses a second-order convergence rate for the relative error of the gradient and a first-order convergence rate for the relative error of the Laplacian, in three-dimensional settings with randomly distributed neighboring particles. Moreover, there is no deterioration of accuracy for realistic particle configurations near free surfaces, where the neighboring particles are distributed not only randomly but also one-sided. Further, the aforementioned accuracy of the improved MRMPS can be obtained by using about 40 to 50 neighboring particles considerably less than conventional particle methods. A simplification for the improved MRMPS is also presented with less computational complexity, solving two 3 × 3 systems instead of one 9 × 9 system, at the cost of losing one order of convergence rate of error.
    Japan Society of Civil Engineers, 2018, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 74(2) (2), I_167 - I_178, Japanese
    [Refereed]
    Scientific journal

  • Magfira Syarifuddin, Satoru Oishi, Djoko Legono, Ratih Indri Hapsari, Masato Iguchi
    Dec. 2017, Advances in Water Resources, 110, 249 - 262
    [Refereed]
    Scientific journal

  • Rain behavior at Mt. Merapi area as observed by XMPR and ARR
    Roby Hambali, Hanggar G. Mawandha, Djoko Legono, Rachmad Jayadi, Satoru Oishi
    Jul. 2017, Proceedings of The 3rd International Conference on Science and Technology, English
    [Refereed]
    International conference proceedings

  • ITO Yuka, JIKIHARA Yukiko, OISHI Satoru, NAKAKITA Eiichi
    土木学会, Mar. 2017, 土木学会論文集B1（水工学）, 73(4) (4), I_229 - I_234, Japanese
    [Refereed]
    Scientific journal

  • Ogawa Mariko, Oishi Satoru, Awata Yasuhiro, Suzuki Kenji, Nakagawa Katsuhiro, Yamaguchi Kosei, Nakakita Eiichi
    直接観測機器を用いた雲内部の雨滴粒径分布の把握は，雲物理と降水特性の理解や，リモートセンシングを用いた降雨量推定精度の向上として重要である．気球搭載型でありCCDカメラを備えたビデオゾンデは航空機観測よりも安全性が高いが，粒径クラスごとの観測個数が1個や2個の場合があり，ビデオゾンデで得られる粒子のサンプル数が粒径分布の推定精度に与える影響が懸念される．本研究は，ビデオゾンデ観測から得られた粒径分布とサンプル数の定量的な評価を行うことを目的とする．まず，乱数を発生させた数値実験より，ビデオゾンデのサンプル数と粒径分布パラメータの推定精度の関係を調査した．さらに，ビデオゾンデで推定された粒径分布から計算されたレーダー反射因子Zとディスドロメータから計算されたZを比較した．ビデオゾンデで4分間に70個以上の雨滴が観測された場合，300回の数値実験のうち64%以上で粒径分布の傾きパラメータを推定できていた．6事例中4事例の実際の粒径分布の推定事例において，ビデオゾンデで推定された粒径分布から計算されたZは，2.9dBZ以下の誤差の範囲内でZを推定できた．
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2017, Proceeding of Annual Conference, 30, 26 - 26, Japanese

  • CHEN Jian, HORI Muneo, O-TANI Hideyuki, OISHI Satoru, FUJITA Kohei, MOTOYAMA Hiroki
    Many scientific and engineering problems, including soil dynamics problems with elasto-plasticity, are involved in solving partial differential equations numerically. The correctness and accuracy of the solutions have to be checked in a rigorous way, i.e., the code used to solve the problems has to be verified. In the field of fluid dynamics, the method of manufactured solutions (MMS) has been proposed and accepted as a de facto standard for code verification. However, we show in this paper that MMS procedures cannot be used directly for soil dynamics problems considering elasto-plasticity. The main difficulty is due to the soil elasto-plasticity which is generally formulated in a rate form coupled by an algebraic constraint (the yield surface). Instead, we propose the method of numerically manufactured solutions (MNMS) for verifying elasto-plastic problems. The concepts and the workflows of MNMS are explained in detail and two simple demonstrations are presented. Though the numerical demonstrations in the present paper are primitive, the capability of the proposed MNMS, as a general and systematic way for developers and users of numerical simulations to verify their codes being used, should not be underestimated.
    Japan Society of Civil Engineers, 2017, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 73(2) (2), I_165 - I_175, Japanese
    [Refereed]
    Scientific journal

  • KOIKE Yudai, OISHI Satoru, OGAWA Mariko
    The present study describes estimation of charge and electric field based on the precipitation particle distribution measurement in thundercloud. An X band multi parameter (MP-X) radar and a multi LF sensor network (BOLT) as lightning detectors were used. Polarization parameters obtained from MP-X radar were used to perform the precipitation particle distinction. Distinguished particle distribution from the polarization parameters including graupel gives particle size distribution, and electric charge amount in the collision of graupel and ice crystals. By solving the Poisson equation with charge amount obtained, the electric potential and the electric field have been calculated.
     In fact, the present study shows possibility to predict lightning by using MP-X radar through calculating charge and electric field in real time.
    Japan Society of Civil Engineers, Mar. 2016, 土木学会論文集B1（水工学）, 72(4) (4), I_1247 - I_252, Japanese
    [Refereed]
    Scientific journal

  • TAHARA Toshihiko, OISHI Satoru
    Japan Society of Civil Engineers, Mar. 2016, 土木学会論文集B1（水工学）, 72(4) (4), I_1237 - I_1242, Japanese
    [Refereed]
    Scientific journal

  • Magfira SYARIFUDDIN, Satoru OISHI, Djoko LEGONO
    土木学会, Mar. 2016, Journal of Japan Society of Civil Engineers, Ser. B1(Hydraulic Engineering), 72(4) (4), I_865 - I_870, English
    [Refereed]
    Scientific journal

  • Magfira SYARIFUDDIN, OISHI Satoru, Djoko LEGONO
    Japan Society of Civil Engineers, Mar. 2016, Journal of Japan Society of Civil Engineers, 72(4) (4), I_865 - I_870, English
    [Refereed]
    Scientific journal

  • 積乱雲の生成・発達を捉えるためのマルチセンサーによるRHI同期観測実験
    NAKAKITA Eiichi, YAMAGUCHI Kosei, OISHI Satoru, OHIGASHI Tadayasu, HASHIGUCHI Hiroyuki, IWAI Hironori, NAKAGAWA Katsuhiro, MASUDA Aritoshi, OGAWA Mariko, SUZUKI Kenji, KAWAMURA Seiiji, SUZUKI Yoshiharu
    Disaster Prevention Research Institute, Kyoto University, Feb. 2016, 京都大学防災研究所年報第58号B, (58) (58), 232 - 236, Japanese
    Research institution

  • GNSS による湾上および山岳域における水蒸気分布と豪雨に関する研究
    OISHI Satoru, YAMAGUCHI Kosei, OGAWA Mariko, NAKA Daisuke, NAKAKITA Eiichi
    Disaster Prevention Research Institute, Kyoto University, Feb. 2016, 京都大学防災研究所年報第58号B, (58) (58), 294 - 304, Japanese
    Research institution

  • Sato Takuya, Ogawa Mariko, Oishi Satoru
    This thesis describes a method to estimate particle size distribution and volume of ice particles in freezing layer using polarimetric radar. The method lead us to predict precipitation earlier than existing weather forecast. The method in this research assumes ice particles in freezing layer as ice crystals having forms of flat spheroid. Through this research, size distribution can be well estimated by using polarimetric parameter of radar. However, radar reflectivity having smaller than 20dBZ gave worse estimation of size distribution. Therefore, necessity to change the formula used in the analysis or the constants such as the dielectric constant under the condition has been proposed. In addition, it was also found that it is necessary to address the uncertainty of the videosonde for verifying the results of the radar.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2016, Proceeding of Annual Conference, 29, 72 - 72, Japanese

  • Muranishi Masahide, Oishi Satoru
    The Volcanological Society of Japan, 2016, PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 2016, 65 - 65, Japanese

  • Satoru Oishi
    IAHR, Jan. 2016, Sustainable Water Resources Planning and Management Under Climate Change, 133 - 154, English
    [Refereed]
    In book

  • Satoru Oishi, Masahiro Iida, Masahide Muranishi, Mariko Ogawa, Ratih Indri Hapsari, Masato Iguchi
    Fuji Technology Press, 2016, Journal of Disaster Research, 11(1) (1), 43 - 52, English
    [Refereed]
    Scientific journal

  • Koike Yudai, Oishi Satoru, Ogawa Mariko
    An analysis of lightning mechanism by calculating the time variation of the electric field and the neutralization by discharge will be conducted. X-band poralimetric Dopplar radars and the lightning detection devices are used for the present study. An analysis is based on the theory of “Riming Electrification” in which contact between graupels and ice crystals give principal electrical charge in the atmosphere. We calculate the time variation of the electric field from the MP radar. During presentation, we will explain the results estimated by calculating the amount of charge possessed by graupels.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2015, Proceeding of Annual Conference, 28, 100066, Japanese

  • Muranishi Masahide, Oishi Satoru, Ogawa Mariko
    A large quantity of volcanic ash produced by the volcanic activity leads to the urban functions failure. In the surrounding area of the volcano, it caused the landslide disaster. In order to taking quick recover action from the disaster and to predict the landslide disaster, we need to know the distribution of the real-time volcanic ash volume. Now, meteorological radar is expected.   We therefore studied the volcanic ash particle size distribution in Sakurajima by videosonde which improved for volcanic ash measurement. Then amount of volcanic ash has been estimated from radar reflectivity and volcanic ash particle size distribution. From the results of this study comparing the radar reflectivity factor of X-band MP radar with the observed value on the ground, we tried to define the relationship between them. As a result, only one biggest eruption during observation campaign gave a sample having good correlation between radar and videosonde.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2015, Proceeding of Annual Conference, 28, 100119, Japanese

  • Mariko Ogawa, Satoru Oishi, Kosei Yamaguchi, Eiichi Nakakita
    The Meteorological Society of Japan, 2015, Scientific Online Letters on the Atmosphere, 11, 134 - 137, English
    [Refereed]
    Scientific journal

  • STUDY ON EFFICIENCY IMPROVEMENT OF TRAIN DISPATCH UNDER SEVERE RAINFALL BY USING RADAR
    Tomoki Oshiro, Satoru Oishi
    2015, PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS, 6706 - 6710, English
    International conference proceedings

  • PREDICTING INDONESIAN TROPICAL MONSOONAL RAINFALL IN WEST TIMOR WITH ARTIFICIAL NEURAL NETWORKS
    Magfira Syarifuddin, Satoru OISHI
    Accurate rainfall predictions, especially for tropical monsoonal rainfall, are among the most difficult tasks in hydrology. In this article, we discuss ANN-based long-term rainfall predictions for Oekabiti, West Timor, Indonesia. Due to the remoteness of the area, the only information available is historical rainfall data. However, by basing on previous studies into the time la
    Japan Society of Civil Engineering, Dec. 2014, Journal of Japan Society of Civil Engineering, Ser. B1 (Hydraulic Engineering),, 70, I_91 - 96, English
    [Refereed]
    Scientific journal

  • A WIRELESS MESH SENSOR NETWORK FRAMEWORK FOR RIVER FLOOD DETECTION WHICH CAN BE USED AS AN EMERGENCY COMMUNICATIONS NETWORK IN CASE OF DISASTER
    Vinicio Anthone, Satoru OISHI
    This study proposes an alternative network relatively simple and inexpensive that can be used for maintaining communications capabilities during major natural disasters and other emergency situations by introducing a system that utilizes Short Message Service (SMS) over Wireless Mesh Sensor Networks (WMSNs). To create this WMSN we propose a system using the water level sensors.
    IAHR, Aug. 2014, 11th International Conference on Hydroinformatics HIC 2014, 104, 284 - 284, English
    [Refereed]
    International conference proceedings

  • 佐野哲也, 末次忠司, 大石哲
    In summer, localized heavy rainfall in a short time on Kofu Basin is caused by a cumulonimbus cloud. We analyzed the characteristics of distribution and preceding surface conditions of cumulonimbus clouds appeared on Kofu Basin using X-MP radar and surface observation data from July to September in 2012. The frequency of the cumulonimbus clouds appeared on Kofu Basin was low. However, the rainfall amount brought by such a cumulonimbus cloud was large. The first appearance of cumulonimbus clouds concentrated from east side to center of Kofu Basin. Before the appearance of a cumulonimbus cloud, south-southwesterly wind with warmish and moist air from the inlet of the valley on southwest side of Kofu Basin and southeasterly wind with warmish and semimoist air crossing the mountains on east side of Kofu Basin co-existed at surface on Kofu Basin with warm and low moist air. The winds formed the convergence and the airs formed the conditional instability on Kofu basin, which formed the environment of the appearance of a cumulonimbus cloud on Kofu Basin.
    土木学会, Feb. 2014, 土木学会論文集B1（水工学）, 70(4) (4), 889 - 894, Japanese
    [Refereed]
    Scientific journal

  • Satoru Oishi, Tadashi Nagase, Yudai Koike, Mariko Ogawa, Eiichi Nakakita, Kosei Yamaguchi
    An analysis for obtaining mechanism of electrical discharge in the atmosphere has been conducted in order to mitigate the risk of lightning disaster. X-band poralimetric Dopplar radars and the lightning detection devices are used for the present study. High-resolution simultaneous data of lightning tracks and precipitation particle class has been superimposed by using three dimensional visualization software. As a result of the analysis, it is shown that the radar reflectivity factor on the lightning tracks is statistically higher than the other area. Moreover, it also shown that the volume which consists of graupels and ice crystals was dominant at the grid where lightning tracks started. The result supported the theory of “Riming Electrification” by Takahashi (1978) in which contact between graupels and ice crystals give principal electrical charge in the atmosphere.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100084 - 100084, Japanese

  • Iida Masahiro, Oishi Satoru
    This study estimates amount of volcanic ash sediment by X-band radar. The volcanic ash has caused a lot of sediment disasters. The frequency of sediment disaster caused by volcanic ash is assumed to be depended on the relationship between amount of volcanic ash sediment and precipitation so that the sediment disaster may be forecasted by estimation of volcanic ash sediment. However, limited access at the area of active volcano slope prevents us from surveying the amount of sedimentation. Therefore estimation of volcanic ash by remote sensing is one of the tangible solution. However the density, shape and rotation of volcanic ash are less homogeneous than raindrop, thus estimation of volcanic ash amount is more difficult. By using numerical scattering simulation and the observation data analysis, we are developing a method for volcanic ash estimation. In the proceedings, the relationship between radar reflectivity factor and density of the volcanic ash in the air is shown as an example.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100117 - 100117, Japanese

  • OTAGIRI Koji, SANO Tetsuya, OISHI Satoru, UCHIYAMA Takashi, KOBAYASHI Hiroshi
     In order to research the hydrological balance at the northern foot region of Mt. Fuji, we investigated the rainfall estimation there in last year. However, it caused impossible observation areas by a single X-MP radar. To reduce impossible observation areas, we investigated the rainfall estimation around Mt. Fuji by composition of 4 X-MP radars.
     In this result, we could estimate rainfall on all over Mt. Fuji for the case of stratiform rain type by composition of 4 X-MP radars. And then we found that the estimated error of X-MP radar was smaller than that by C-band meteorological radar for the cases of stratiform and convective rain.
     Therefore, we could show availability of the rainfall estimation by composition of 4 X-MP radars.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100080 - 100080, Japanese

  • Oshiro Tomoki, Oishi Satoru
     In recent years, the number of heavy rain has been increasing. Railway companies take measures against rainfall disasters. This research focuses one of the “soft” countermeasure, operation control. The decision for railway operation depends on the rainfall observed by railway rain-gauges. However, railway rain-gauges cannot observe a localized rainfall, because it is placed only every dozen kilometers.
     In this research, Radar/Raingauge-Analyzed Precipitation data (analyzed precipitation) has been applied to decision making. The analyzed precipitation is almost similar to a rain-gauge data, but the analyzed precipitation has uncertainty and an error from rain-gauge data. Verification of the effect of uncertainty on operation control decision has been conducted.
     According to the results, amount of analyzed precipitation can capture a localized rainfall. It was found that probabilistic decision making using the analyzed precipitation gives distinct, safe and efficient operation.
     Although verification using hourly rainfall was described on the proceedings, accumulated rainfall amount will be taken into account at the presentation. 
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100082 - 100082, Japanese

  • Tahara Toshihiko, Oishi Satoru
    This study evaluated usefulness of using One-week Ensemble Prediction made by JMA and operation models using Dynamic Programming (DP) and Stochastic Dynamic Programming (SDP) to decide the optimized operation of discharge of the dam. To evaluate usefulness, these models were applied to operation of the Hiyoshi Dam located at the upper reaches of the Katsura River when heavy rain was brought by Typhoon 18 (MAN-YI) in 2013. From the results of the study, if One-week Ensemble Prediction is accurate to some extent, it is useful to decide the optimized operation. Moreover the proposed method which decides the amount of discharge using One-week Ensemble Prediction before it starts to rain demonstrates fully effective flood control.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100098 - 100098, Japanese

  • Ogawa Mariko, Oishi Satoru, Suzuki Kenji, Nakagawa Katsuhiro, Yamaguchi Kosei, Nakakita Eiichi
    In order to improve radar observation of ice particles in terms of accuracy and physical meaning, this study investigates the relationship between actual radar reflectivity factor of ice particles and estimated hypothetical radar reflectivity factor based on diameters of measured by videosonde. Focusing the error generated by using longer axis as a representative diameter is the special characteristics of the study. Campaign observation synchronized with videosonde was conducted in BAIU season around Okinawa islands, Japan. RHI (Range Height Indicator) scan mode synchronized with videosonde that can observe precipitation particles directly. Hypothetical radar reflectivity factor was calculated from ice particles pictures taken by videosonde. The physical meaning of radar observation for ice particles is investigated in this study. Hypothetical radar reflectivity factor calculated based on diameters measured by videosonde is verified through analyzing a difference of observational characteristics between radar and videosonde for utilizing ground-based in-situ observation installing disdrometer also.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100085 - 100085, Japanese

  • Reni Sulistyowati, Ratih Indri Hapsari, Fadli Syamsudin, Shuichi Mori, Satoru T. Oishi, Manabu D. Yamanaka
    Meteorological Society of Japan, 2014, Scientific Online Letters on the Atmosphere, 10(1) (1), 141 - 144, English
    [Refereed]
    Scientific journal

  • SANO Tetsuya, SUETSUGI Tadashi, OISHI Satoru
    On 18 February 2013, the stratiformed precipitating system associated with an extratropical cyclone hitting the Pacific coast on Japan covered Shizuoka region and Kofu basin, which was observed by X-band multi-parameter radars. From the observation of X-band multi-parameter radars, on Kofu Basin, the brightband appeared near the surface and ascended, so that the condition of precipitation changed snowfall to rainfall. Then, the brightband height decreased gradually from Shizuoka region to Kofu Basin. Above them, it is suggested as follows; the height variation of brightband contributed to the determination of precipitating condition at surface (e.g. rainfall or snowfall), and the brightband observation by X-band multi-parameter radars installed in a low altitude site is important for the simple classification of rainfall and snowfall in the stratiformed precipitating system.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2013, Proceeding of Annual Conference, 26, 120 - 120, Japanese

  • OTAGIRI Koji, SANO Tetsuya, OISHI Satoru, UCHIYAMA Takashi, KOBAYASHI Hiroshi
    As part of studies for the maintenance and utilization of water resources on the northern foot region of Mt. Fuji, we investigate the rainfall estimation there. As the preliminary study, we compared rainfall estimated by X-MP radar and C-band meteorological radar with surface rainfall on the northern foot region of Mt. Fuji.  From the analyses, we found that the correlation between rainfall at surface and estimated by X-MP radar was high for the cases of stratiform and convective rain. Then, the accuracy of the rainfall estimation of X-MP radar was better than that by C-band meteorological radar.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2013, Proceeding of Annual Conference, 26, 114 - 114, Japanese

  • Watanabe Ayaka, Souma Kazuyoshi, Suetsugi Tadashi, Sano Tetsuya, Oishi Satoru, Kakizawa Kazuhiro, Ishidaira Hiroshi
    X-band Multi Parameter Radar enables to obtain detailed and various parameters to estimation of rainfall amount. It is expected to contribute to real time observation of localized heavy rainfall and disaster reduction. However, large errors in rainfall estimation have been reported over distant mountainous regions in Yamanashi because the radar beams are blocked by mountains and attenuated by strong rainfall. In this study, estimated rainfall using X-band Multi Parameter radar of University of Yamanashi was compared with rain gauge data provided by Japan Meteorological Agency and Yamanashi prefecture. Comparisons were carried out for stratiform rainfall, convective rainfall and typhoon case. As a result, the estimation accuracy was clearly different by rainfall type. And in the stratiform rainfall case, estimation accuracy was high even over the distant area from the Radar site.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2013, Proceeding of Annual Conference, 26, 116 - 116, Japanese

  • Assessing the Uncertainties of Radar Rainfall Prediction and Runoff Simulation Parameter: Toward an Operational Ensemble Flood Forecasting in Urban River Basin
    Ratih Indri Hapsari, Satoru Oishi
    2013, PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV, English
    [Refereed]
    International conference proceedings

  • Ensemble short-term rainfall-runoff prediction and its application in urban flood risk mapping
    Ratih Indri Hapsari, Satoru Oishi, Kengo Sunada, Tetsuya Sano, Dian Sisinggih
    IAHR, 2013, IAHS-AISH Publication, 357, 308 - 319, English
    [Refereed]
    International conference proceedings

  • Effects of soil moisture on a summertime convective rainfall over a mountainous area and its contiguous plain in central Japan
    Kazuyoshi Souma, Kenji Tanaka, Tadashi Suetsugi, Kengo Sunada, Eiichi Nakakita, Kaoru Takara, Satoru Oishi
    2013, CLIMATE AND LAND SURFACE CHANGES IN HYDROLOGY, 359, 246 - 252, English
    [Refereed]
    International conference proceedings

  • Effects of soil moisture on a summertime convective rainfall over a mountainous area and its contiguous plain in central Japan
    Kazuyoshi Souma, Kenji Tanaka, Tadashi Suetsugi, Kengo Sunada, Eiichi Nakakita, Kaoru Takara, Satoru Oishi
    IAHS, 2013, IAHS-AISH Proceedings and Reports, 359, 246 - 252, English
    [Refereed]
    International conference proceedings

  • Study on Optimization of the Integrated Dam Operation Using Ensemble Prediction in the Upper Reaches of the Nabari River
    Hiroko Masuda, Satom Oishi
    2013, PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV, 10438 - 10447, English
    [Refereed]
    International conference proceedings

  • Tran Van Ty, Kengo Sunada, Yutaka Ichikawa, Satoru Oishi
    Mar. 2012, Water Resources Management, 26(5) (5), 1387 - 1407
    [Refereed]
    Scientific journal

  • ANALYSES OF DISTRIBUTION AND INCREASING MECHANISM OF RAIN OVER MOUNTAIN SLOPES SURROUNDING A BASIN USING X-MP RADAR
    佐野 哲也, 大石 哲, 中村 高志, 砂田 憲吾
    Mar. 2012, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), Vol.68,No.4, I_355-I_360, Japanese
    [Refereed]
    Scientific journal

  • ENSEMBLE FLOOD PREDICTION BY CASCADING THE UNCERTAINTY FROM RAINFALL TO RUNOFF SHORT-TERM PREDICTION
    Ratih Indri Hapsari, Satoru Oishi, Kengo Sunada
    Mar. 2012, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), Vol. 68, No.4, I_139-I_144
    [Refereed]
    Scientific journal

  • Temur KHUJANAZAROV, Yutaka Ichikawa, Jun Magome, Satoru Oishi
    The concept of developing a web-based platform for arranging, storing, and geospatial visualization of hydrological data with a goal of research collaboration is presented. The platform, which will help researchers arrange their own data and visualize data from observational stations in their area of interest, will be a working environment for planning and conducting research activities.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, Mar. 2012, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), Vol. 68, No.4, pp.I_151-I_156, 72 - 72, Japanese
    [Refereed]
    Scientific journal

  • Kenji Suzuki, Kensaku Shimizu, Tadayasu Ohigashi, Kazuhisa Tsuboki, Satoru Oishi, Seiji Kawamura, Katsuhiro Nakagawa, Kosei Yamaguchi, Eiichi Nakakita
    2012, SOLA, 8, 001-004, English
    Scientific journal

  • Tetsuya Sano, Satoru Oishi, Kengo Sunada
    MSJ, 2012, Journal of the Meteorological Society of Japan, 90(5) (5), 807 - 831, English
    [Refereed]
    Scientific journal

  • Kenji Suzuki, Kensaku Shimizu, Tadayasu Ohigashi, Kazuhisa Tsuboki, Satoru Oishi, Seiji Kawamura, Katsuhiro Nakagawa, Kosei Yamaguchi, Eiichi Nakakita
    2012, Scientific Online Letters on the Atmosphere, 8(1) (1), 1 - 4
    [Refereed]
    Scientific journal

  • Advanced usage of GPS slant delay for detecting water vapor variation over the Osaka bay
    S. Oishi, K. Tsuchiya, A. Wada, T. Iwabuchi, E. Nakakita
    ION-GNSS, 2012, 25th International Technical Meeting of the Satellite Division of the Institute of Navigation 2012, ION GNSS 2012, 5, 3392 - 3397, English
    [Refereed]
    International conference proceedings

  • Structure of a Cumulonimbus Cloud Maintained for a Long Time over a Slope between Mountains in Summer Season
    Sano Testuya, Oishi Satoru, Sunada Kengo
    Mar. 2011, Proceedings of International Conference on Mesoscale Convective Systems and High-impact Weather (ICMCS-VIII), English
    Scientific journal

  • Singular Vector Method on Short Term Rainfall Prediction Using Radar And Distributed Hydrological Model
    Ratih Indri Hapsari, OISHI Satoru
    Mar. 2011, Annual Journal of Hydraulic Engineering, JSCE, Vol. 55, 2011, CDROM, English
    [Refereed]
    Scientific journal

  • 再現ビデオを用いた防災教育に対する児童の記憶の持続性と意識の把握に関する研究
    稲垣 意地子, OISHI Satoru, 砂田 憲吾, 湯本 光子
    Mar. 2010, 水工学論文集, Vol 54, pp. 625-630, Japanese
    [Refereed]
    Scientific journal

  • 鉱物組成を用いた富士川流域における土砂 生産源推定に関する基礎研究
    OISHI Satoru, 砂田 憲吾, Dian Sisinggih, 宮沢直季
    Mar. 2010, 水工学論文集, Vol 54, pp. 673-678, Japanese
    [Refereed]
    Scientific journal

  • THE ESTIMATION OF GROUNDWATER EXCHANGE IN AYDARKUL-ARNASAY LAKE SYSTEM BY A LAKE WATER BALANCE MODEL
    Sri Wahyuni, OISHI Satoru, SUNADA Kengo, Toderich K. N
    Mar. 2010, Annual Journal of Hydraulic Engineering, JSCE, Vol 54, pp. 205-210, English
    [Refereed]
    Scientific journal

  • PROGRESSIVE WATER RESOURCES MANAGEMENT BASED ON SYSTEMATIC APPROACHES
    KOJIRI Toshiharu, OISHI Satoru
    Mar. 2010, Annual Journal of Hydraulic Engineering, JSCE, Vol 54, pp. K1-K6, English
    [Refereed]
    Scientific journal

  • IMPROVING FLOOD SIMULATION IN URBAN RIVER BASIN USING X-BAND POLARIMETRIC RADAR AND DISTRIBUTED HYDROLOGICAL MODEL
    Ratih Indri Hapsari, OISHI Satoru, SUNADA Kengo, SANO Tetsuya
    Mar. 2010, Annual Journal of Hydraulic Engineering, JSCE, Vol 54, pp. 121-126, English
    [Refereed]
    Scientific journal

  • SANO TETSUYA, OISHI SATORU
    We investigated the characteristics of distribution of specific differential phase (KDP) in the Heavy Rainfall Area (HRA) 1 observed by X-band Dual-Polarimetric Doppler Radar of University of Yamanashi on September 4, 2009. The core of KDP over 6 deg/km appeared at that of radar reflectivity (ZH) under 4 km ASL. Above 5 km ASL, KDP of 0 - 1 deg/km was distributed without the distribution of ZH. The increasing gradient of KDP from upper to lower layers appeared at 4 - 5 km ASL with the melting level. It is suggested for the distribution of KDP as follows, (1) the structure composed by rain drops (solid precipitating particles) was appeared clearly (unclearly) and (2) the increasing gradient reflected the transition of distributions from solid precipitating particles and rain drops.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2010, Proceeding of Annual Conference, 23, 18 - 18, Japanese

  • Suzuki Shusuke, Oishi Satoru, Sano Tetsuya
    In this present study, rainfall data in Yamanashi was collected using X-band dual-polarimetric radar of University of Yamanshi. And the verification of accuracy concerning the rainfall amount estimation and consideration concerning the estimation difference were done by analyzing these data. As a result, the rainfall estimation by specific diffential phase KDP did not receive the rainfall attenuation easily compared with reflectivity factor ZH. In addition, from the comparison with AMeDAS, the rainfall estimation accuracy on September 4 was acceptable result. However, on October 8 was not acceptable result. For this reason, there are still problems in the rainfall estimation by KDP in Yamanashi. And it has been understood that the estimate accuracy changes by rainfall type or intensity.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2010, Proceeding of Annual Conference, 23, 107 - 107, Japanese

  • Hasegawa Kenta, Oishi Satoru, Sano Tetsuya
    Difficulty on direct observation of precipitation falling processes is one of the factors that insufficient for short-time quantitative precipitation forecasting. This study discussed precipitation falling processes using by the dual polarimetric doppler radar on university of yamanashi. The elevation angle model using each altitude of the terminal fall velocity of raindrops and the doppler velocity was developed as estimating slope of strong echo region. In case of rainfall event at Aug/2/2009, model results were validated by observed echo images. This model could adequately represent time variation of elevation angle. It was indicated that slope of strong echo region was influenced by difference of between migration velocity of rain area and wind velocity on each altitude.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2010, Proceeding of Annual Conference, 23, 108 - 108, Japanese

  • KAKIZAWA Kazuhiro, SUNADA Kengo, SUETSUGI Tadashi, OISHI Satoru
    This study calculated sediment production rate using global precipitation data by satellite observation in the Mekong River basin. Availability of using satellite observation data was discussed from comparisons of estimated sediment production rate on precipitation by ground rain gauges and observed sediment production rate. In this study, daily precipitation from the GPCP and GSMaP data set inputted to USLE as estimation of annual sediment production rate. As a result, these results were nearly value which inputted ground rain gauge data which complemented by Thiessen method. And sediment production rate by the GPCP and GSMaP were better accuracy than the observed rain gauge data. Satellite observation data is useful on using USLE method was indicated.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2010, Proceeding of Annual Conference, 23, 86 - 86, Japanese

  • Impact of Uncertainty of Polarimetric Radar-Rainfall Inputs on Distributed Hydrological Model in Urban River Basin
    Ratih Indri Hapsari, Satoru Oishi, Kengo Sunada, Tetsuya Sano
    2010, PROCEEDINGS OF 2010 INTERNATIONAL CONFERENCE ON ENVIRONMENTAL SCIENCE AND DEVELOPMENT, 491 - 495, English
    [Refereed]
    International conference proceedings

  • Inundation Model Integrating with X-Band Polarimetric Radar for Flood Disaster Prevention in Urban Area
    Ratih Indri Hapsari, Satoru Oishi, Kengo Sunada, Dian Sisinggih, Tetsuya Sano
    2010, PROCEEDINGS OF 2010 INTERNATIONAL CONFERENCE ON ENVIRONMENTAL SCIENCE AND DEVELOPMENT, 248 - 253, English
    [Refereed]
    International conference proceedings

  • Thi Thanh Hang Phan, Kengo Sunada, Satoru Oishi, Yasushi Sakamoto
    2010, Journal of Water and Climate Change, 1(4) (4), 269 - 279, English
    [Refereed]
    Scientific journal

  • Tran van Ty, Kengo Sunada, Yutaka Ichikawa, Satoru Oishi
    2010, International Journal of River Basin Management, 8(3-4) (3-4), 305 - 317, English
    [Refereed]
    Scientific journal

  • Tran Van Ty, Kuka, Singh Babel, Kengo Sunada, Satoru Oishi, Akiyuki Kawasaki
    The objective of the study is to develop a GIS-based water infrastructure inventory (WII) for water resources assessment in the upper Srepok basin, Vietnam. The water availability and demand were estimated using common methods. Different water scarcity indicators were estimated to examine the water situation at district level under present and future conditions and future water development needs are assessed. Results reveal that the aggregated information on the basin scale misleads the issue of water situation, especially the scarcity at local level due to high spatio-temporal variations of water resources availability and demands. Most districts in the study basin will experience severe water scarcity in 2010 and 2020 in both physical and economic terms. Generated data from the WII shows very low percentage of water withdrawals in several districts with respect to available resources. Therefore, to meet future demand, significant investment in water infrastructure is needed.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, Jul. 2009, Hydrological Research Letters, 3, 27 - 31, English
    [Refereed]
    Scientific journal

  • Nguyen T.Hai Yen, Kengo Sunada, Satoru Oishi, Kou Ikejima, Tomaya Iwata
    Jun. 2009, Journal of Great Lakes Research, 35(2) (2), 169 - 174
    [Refereed]
    Scientific journal

  • ASSESSMENT OF HALOPHYTIC VEGETATION TO IMPROVE LIVESTOCK FEEDING RESOURCES ON SALINE DESERT RANGELANDS
    Dildora Aralova, Elena Shuyskaya, Timur Khujanazarov, Kristina Toderich, Faisal Taha, Satoru Oishi, Pavel Voronin, Clanton Black
    May 2009, Polskie Towarzystwo Informacji Presestrzennej, Vol.35, No.5
    [Refereed]
    Scientific journal

  • 長期水文・気象データおよび衛星データを用いたアラル海流域における水循環の解析
    甲山治, 大石哲, 砂田憲吾, 馬籠純
    Mar. 2009, 土木学会水工学論文集53, pp.31-36．, Japanese
    [Refereed]

  • Development of hydrometeor classification system using polarimetric radar measurements synchronized with the video-sonde observation (in Japanese with English abstract)
    Nakakita, E, K. Yamaguchi, Y. Sumida, H. Takehata, K. Suzuki, K. Nakagawa, S. Oishi, Y. Shusse, K. Tsuboki, T. Ohigashi
    Feb. 2009, Annual Journal of Hydraulic Engineering, 53, 361 - 366, Japanese
    [Refereed]
    Scientific journal

  • KAKIZAWA Kazuhiro, SUNADA Kengo, MIYAZAWA Naoki, OISHI Satoru
    This study applied global warming experiment simulation result data (an A1B scenario and a present climate) by Meteorological Res. Inst. with YHyM/BTOPMC and a riverbed variation simulation model for the whole Mekong River basin. Change of sediment transportation in the Mekong River basin on the climate change was discussed. From results of the suspended sediment concentration at Chiang Saen, the value on an A1B scenario was larger than a present climate, and wash-road increase was suggested. The volume of sediment production by USLE on the A1B scenario was approximately 2 times of the present climate. The sediment production rate in upper part (a steep slope area) on the climate change will be large, and it affect to the sediment transportation in the lower part.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2009, Proceeding of Annual Conference, 22, 100 - 100, Japanese

  • Takii Munekazu, Oishi Satoru, Nakakita Eichi, Sunada Kengo
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2009, Proceeding of Annual Conference, 22, 97 - 97, Japanese

  • Oishi Satoru, Hanawa Natsuki, Sunada Kengo
    An estimation method to calculate Probable Maximum Precipitation based on satellite based precipitation data is proposed. In the method, the cloud cluster from the global precipitation data from satellite is extracted. The region where the cloud cluster is generated easily is specified. In addition, 11 regions where the cloud cluster is generated easily were selected to compare the cloud cluster and precipitation. Two method of estimating PMP for one month was proposed by using a regression line between the monthly averaged frequency of cloud cluster and monthly averaged rainfall, most effective cloud clusters and the maximum frequency of cloud cluster. The PMP of November in Malay Peninsula was estimated as 531 mm/mon.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2009, Proceeding of Annual Conference, 22, 92 - 92, Japanese

  • Iijima Kensuke, Oishi Satoru, Nakakita Eiichi, Suzuki Kenji
    A study having an objective to estimate the maximum snowflake diameter in high altitude of cloud through thickness of bright band observed by radar has been conducted. Data was collected during the hydro-meteorological observation project including video sonde observation. Melting layer thickness which is defined as the height between start and end of melting was estimated by using maximum snowflake diameter observed video sonde. The estimation used the snowflake melting model proposed by Matsuo and Sasyo. It was understood that the melting layer thickness estimated by the model and the observed thickness by radar bright band were relatively similar. According to the result, the maximum snowflake diameter can be estimated by using the bright band and the snowflake melting model.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2009, Proceeding of Annual Conference, 22, 96 - 96, Japanese

  • Hai Yen T. Nguyen, Ole Pedersen, Kou Ikejíma, Kongo Sunada, Satoru Oishi
    2009, Journal of Fisheries and Aquatic Science, 4(2) (2), 90 - 102
    [Refereed]
    Scientific journal

  • Sokhem Pech, Sunada Kengo, Satoru Oishi, Naoki Miyazawa, Daisuke Tanaka
    Sep. 2008, International Journal of River Basin Management, 6(3) (3), 277 - 282
    [Refereed]
    Scientific journal

  • Takii Munekazu, Ohishi Satoru, Nakakita Eiiti, Suzuki Kenji, Nanko Kazuki, Takahashi Tsutomu, Tuboki Kazuhisa, Ohigashi Tadayasu, Nakagawa Katsuhiro, Shusse Yukari, Sugimoto Souitirou
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2008, Proceeding of Annual Conference, 21, 49 - 49, Japanese

  • Iijima Kensuke, Oishi Satoru, Nakakita Eiichi, Suzuki Kenji
    Mechanism of rainfall process through collecting and analyzing data from advanced radar namely COBRA is investigated in this study. The effect of COBRA for measuring rainfall process is expected in the following field; i) detailed bistatic characteristics from each type of raindrop, ii) classification of type of raindrops, iii) correction of attenuation during the severe rainfall, iv) removal of ground clatter, v) estimation of rain drop size distribution. However, classification of type of raindrops has not been done yet. Therefore, with using the Micro Rain Radar, rainfall process is investigated through estimating the rain drop size distribution.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2008, Proceeding of Annual Conference, 21, 48 - 48, Japanese

  • KOZAN OSAMU, Oishi Satoru, SUNADA KENGO
    The Kyzylkum desert is a typical desert area and has unique climate condition and ecosystems. There are small oases in this area and local people use them for crop irrigation. To understand the hydrological cycle is important for local people and sustainable farming, however there are not enough data for scientific analysis. Moreover, air temperature is increasing about 0.9-1.0 degree for 100 years and 0.4-0.5 degree for 25 years in Uzbekistan which is relatively higher than global averages. The object of this study is to understand the hydrological and ecological systems in this region including climate variation and change. We started the land surface observation since November 2006 in Kyzyk ke sek.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2008, Proceeding of Annual Conference, 21, 4 - 4, Japanese

  • Pech Sokhem, Kengo Sunada, Satoru Oishi
    Dec. 2007, Water International, 32(4) (4), 503 - 523
    [Refereed]
    Scientific journal

  • Kitamura, Y., Kozan, O., Sunada, K., Oishi, S.
    Jun. 2007, Journal of Disaster Research, 2(3) (3), 134 - 142, English
    [Refereed]
    Scientific journal

  • Rainfall and Sediment runoff in the Lesti River Bain, Tributary of the Brantas River
    Nakagawa, H, Satofuka, Y, Oishi, S, Muto, Y, Sayama, T, Takara, T, Sharma, R. H
    京都大学防災研究所, Apr. 2007, Annuals of Disaster Prevention Research Institute, Kyoto Univ., (50B) (50B), 623 - 634, Japanese
    Research institution

  • Dian Sisinggih, OISHI Satoru, SUNADA Kengo
    X-ray powder diffraction (XRD) is widely used for geological analysis of sediment samples. In this study a method for detecting sources of sedimentation using mineral composition obtained by the qualitative phase of XRD is proposed. Possible minerals matching resulted from the Hanawalt's searchmatch method were arranged into binary matrix of mineral composition of each sampling site. Hierarchical cluster analysis was grouped samples into clusters based on mineral similarity and yielded a dendrogram. Using information of sample's environment, the meaning of dendrogram was derived for sediment fingerprinting.
    The result showed that sedimentation sources in the Sengguruh reservoir mainly come from 10-30° slope of the Lesti basin and cultivated area downstream of the Brantas origin. Comparing with the field observation and satellite data, a good correlation was obtained.
    Japan Society of Civil Engineers, 2007, Doboku Gakkai Ronbunshuu B, 51, 121 - 126, English

  • Kozan Osamu, Oishi Satoru, Sunada Kengo
    Amy Darya and Syr Darya basins in the Central Asia have high sensitivity about temperature warming. In this presentation, we introduce our land surface monitoring, which is cooperated with ICBA (International Center for Biosaline Agriculture) project, and its purpose and perspective for understanding the local hydrological system.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2007, Proceeding of Annual Conference, 20, 72 - 72, Japanese

  • N. T. H. Yen, K. Sunda, S. Oishi, K. Ikejima
    2007, Sustainable Development and Planning III, Vols 1 and 2, 102, 901 - 912, English
    [Refereed]
    International conference proceedings

  • N. T.H. Yen, K. Sunda, S. Oishi, K. Ikejima
    2007, WIT Transactions on Ecology and the Environment, 102, 901 - 912
    [Refereed]
    Scientific journal

  • HASHIMOTO Noriaki, TAKADA Nozomu, OISHI Satoru
    It is very important for appropriate dam operation and disaster prevention to predict severe rainfall in mountainous region. For last several years, we have developed rainfall prediction system for the Kurobe-Valley, which is consist of steep mountains and valleys. The system has been already installed and used at the dam administration offices. The system had a weak point in terms of the rainfall prediction especially at the beginning of rainfall event. In this paper, we reveal that precipitable water vapor is related with rainfall event, and propose a new index which is applicable for the signal of the beginning of rainfall event for real-time estimation.
    Japan Society of Civil Engineers, 2006, Doboku Gakkai Ronbunshuu B, 50, 397 - 402

  • Kozan Osamu, Tsukada Yukimasa, Oishi Satoru, Sunada Kengo
    Based on hydrological and meteorological data analysis, landcover type and green-up onset and offset are estimated using time-series analysis of PAL (Pathfinder AVHRR Land) data from January 1982 to Decenber1 1998. Our results show that air temperature determines green-up time and soil moisture (which is related to precipitation, temperature, snow melting and discharge) determines the vegetation type and its response in this area. Some of detected landcover changing places during analysis period are caused by air temperature warming because it brings promoting of evapotranspiration and dry soil condition. However, most of changing places are caused by not only natural condition but human activity directly or indirectly. Water usage system in this area affects large scale hydrological cycle and vegetation types so much.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2006, Proceeding of Annual Conference, 19, 23 - 23

  • OISHI Satoru, SAYAMA Takahiro, NAKAGAWA Hajime, SATOFUKA Yoshifumi, MUTO Yasunori, Dian Sisinggih, SUNADA Kengo
    In order to build a connection between former study of fine sediment yield and former study of rainfall system, the observation of raindrop size distribution and sediment yield has been made in the Lesti river basin that is a tributary of the Brantas river in Indonesia.
    The following results were obtained. Rainfall energy work which are calculated by size distribution obtained by MRR has good relationship with rainfall amount obtained by a raingage. The energy which is used for calculating sediment yield is proven to be treated as linear to rainfall amount. On the other hand, the spatially non-uniform rainfall is shown in the Lesti river basin. The methods for treating the limited rainfall data is proposed in this study. Finally, the accumulation and erosion of sediment is observed in three points in the Lesti river basin. Moreover, main items which are important to estimate the sediment yield is picked up by the observation.
    Japan Society of Civil Engineers, Feb. 2005, Doboku Gakkai Ronbunshuu B, 49(2) (2), 1087 - 1092, Japanese
    [Refereed]

  • Hydraulic and morphological characteristics of the lower Mekong River
    Naoki Miyazawa, Kengo Sunada, Pech Sokhem, Satoru Oishi, Dian Sisinggih
    Korea Water Resources Association, 2005, 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges, 5091 - 5100, English
    International conference proceedings

  • Study on trends of fish resources in the Tonle Sap Basin - Their corelation with hydrological conditions of Mekong River
    Pech Sokhem, Kengo Sunada, Satoru Oishi, Naoki Miyazawa, Daisuke Tanaka
    Korea Water Resources Association, 2005, 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges, 4453 - 4462, English
    International conference proceedings

  • Sisinggih Dian, SUNADA Kengo, OISHI Satoru
    The lifetime of Sengguruh and Sutami reservoirs have been evaluated based on erosion and sedimentation rate calculated using combination USLE (Universal Soil Loss Equation) method with distributed model in GIS. The sedimentation calculated by distributed model shows a good approximation comparing with the echo-sounding data. Results show that annual sedimentation in the Sengguruh reservoir is predicted around 2, 148, 000 ton, while Sutami reservoir is around 1, 707, 600 ton. Comparing with the echo-sounding data from those reservoirs, the error percentages in volume of sedimentation are 9.5% and 13.6% respectively. Their effective storages are predicted full of sediment in 2.78 years and 147.6 years. Finally, the verification indicated that the proposed method is well applicable to predict the erosion-sedimentation and to evaluate the reservoir lifetime in this basin.
    Japan Society of Civil Engineers, 2005, Doboku Gakkai Ronbunshuu B, 49, 1063 - 1068, English

  • Sunada Kengo, Oishi Satoru, Miyazawa Naoki, Pech Sokhem, Tanaka Daisuke
    The study uses a simple ecosystem model to grasp the relationship between the change in inundated areas (water level and flood extends) and the level of fish production in the TSB. The model produces the fish production trends in the TSB that can be refined to reflect the changes in key parameters such as flood extends and relative area density. It shows the continued dominance of the opportunist species in the TSB fish composition in the years to come. It reconfirms the importance of the hydrological and biological linkages between the TSB and the Mekong River Basin, since over 60% of the fish catch in the TSB is contributed by the white fish that mitigates to and from other parts of the Mekong River. It is an issue requiring a cross-sectroral and cross-bundary integrated planning and development.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2005, Proceeding of Annual Conference, 18, 5 - 5

  • Pech Sokhem, Sunada Kengo, Oishi Satoru, Miyazawa Naoki
    The paper analyses the possible cumulative impacts of the hydropower and irrigation development, and climate change (as conceptual issue) in the Mekong River Basin, and the scope for balancing water availability and demand especially in the drier years, and to assess the flood conditions. The cumulative impacts from the key development svenarios are assessed by using a simple "spreadsheet" and simulated results of the selected development scinario. The assessment of flow changes is expexted by comparing pre-difined river flow -'baseline' flow series at the selected assessment points (APs) along the Lower Mekong River starting from Chiang Saen to Kratie with the assumed changes in flow. The study results show remarkable change in flow regime of the Mekong Basin. These changes are expexted to have different implication for diffrent stretches of the river and to diffrent water use sectors and ecology. It serves as a good indicative for the furture development of the sustainable waterpolicy for the Mekong Basin.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2005, Proceeding of Annual Conference, 18, 76 - 76

  • HIRABAYASHI Katsura, SUNADA Kengo, OISHI Satoru, MIYAZAWA Naoki
    The authors conducted a set of survey on suspended sediment transportation in the Kataniwa River, during the flood on September 22nd '96, and June 19th '97, and found out that the peak of wash load concentration appeared earlier than the peak of discharge, and fluctuation of wash load concentration followed the fluctuation of the rainfall intensity. To investigate these phenomena, a numerical simulation model, which describes the run-off of water and sediment transportation on the Kataniwa river basin, was developed. The model was given two processes of sediment transportation; wash load yields by the impact of raindrops and surface flow on the surface of basin, and suspended load yields in the channel. The result of simulation showed fairly good agreement with the observed data.
    Japan Society of Civil Engineers, Aug. 2004, Doboku Gakkai Ronbunshu, (768) (768), 33 - 43, Japanese

  • 大石 哲, 浅田 浩之, 中川 勝弘, 砂田 憲吾
    水文・水資源学会, 2004, 水文・水資源学会研究発表会要旨集, 17, 246 - 247, Japanese

  • Formation of a terrace in the curved channel widened by implementation on the Hinuma river
    K Hirabayashi, K Sunada, S Oishi, N Miyazawa
    2004, PROCEEDINGS OF THE NINTH INTERNATIONAL SYMPOSIUM ON RIVER SEDIMENTATION, VOLS 1-4, 1802 - 1809, English
    [Refereed]
    International conference proceedings

  • Bed elevation variations inside the Mega-Dike system in the Pasig-Potrero river basin using a 2D numerical model of mudflows
    N Miyazawa, K Sunada, S Oishi, K Hirabayashi
    2003, DEBRIS-FLOW HAZARDS MITIGATION: MECHANICS, PREDICTION, AND ASSESSMENT, VOLS 1 AND 2, 659 - 670, English
    [Refereed]
    International conference proceedings

  • OISHI SATORU
    The authors conducted a set of survey on wash load transportation at the two sites in the Hinuma River, during a fl ood on June 19th, 1997, and found out a decrease in wash load concentration between the upper site (46.0km) and the lower site (28.1km). A numerical simulation was carried out to investigate causes of the decrease. CIP scheme was introduced to solve the unsteady advection-diffusion equation in the model of wash load transportation model. Results of the simulation show that the advection dominated and the diffusion did not in the process of the wash load transportation, and lateral outflow of wash load, which was caused by the trapping of vegetation, was one of the causes of the decrease in wash load concentration.
    土木学会, 2003, 水工学論文集, 第47巻, pp.691 - 696, Japanese
    Scientific journal

  • OISHI SATORU
    In this study, we investigate the effect of size distribution of rain drop on the wet deposition of nitrate. The numerical acid rain model which uses the bin method for calculating the cloud microphysical processes is used for the investigation. The results are as follows, i) rain which mainly consists of large size droplets makes much amount of wet deposition of nitrate, ii) accumulated rainfall amount is important to estimate the amount of wet deposition of nitrate, iii) spatial variation of wet deposition of nitrate is large, and iv) wet deposition of nitrate can be estimated by space borne radar with considering the graupel fall.
    土木学会, 2003, 水工学論文集, 第47巻, pp.115 - 120, Japanese
    Scientific journal

  • OISHI SATORU
    水文・水資源学会, 2003, 水文・水資源学会誌, 16(5) (5), 501 - 517, English
    Scientific journal

  • 大石 哲, 青木 敦彦, 砂田 憲吾, 池淵 周一
    水文・水資源学会, 2002, 水文・水資源学会研究発表会要旨集, 15, 226 - 227, Japanese

  • A 2D numerical modeling of mudflow and its applicability to the Mt. Pinatubo area, Philippines
    N Miyazawa, K Sunada, S Oishi, K Hirabayashi
    2002, ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS, 382 - 387, English
    [Refereed]
    International conference proceedings

  • A study of the characteristics of suspended sediment load in the Kataniwa River basin
    K Hirabayashi, K Sunada, S Oishi, N Miyazawa
    2002, ADVANCES IN HYDRAULICS AND WATER ENGINEERING, VOLS 1 AND 2, PROCEEDINGS, 243 - 248, English
    [Refereed]
    International conference proceedings

  • OISHI SATORU
    土木学会, 2002, 水工学論文集, 第46巻, pp.1 - 6, Japanese
    Scientific journal

  • OISHI SATORU
    土木学会, 2002, 水工学論文集, 第46巻, pp.941 - 946, Japanese
    Scientific journal

  • OISHI SATORU
    土木学会, 2002, 水工学論文集, 第46巻, pp.31 - 36, Japanese
    Scientific journal

  • OISHI SATORU
    In flood control, the decision support information made by short-term severe rainfall prediction methods and flood control support systems are indispensable for quick and appropriate operation. On the other hand, it is difficult to forecast the weather of meso-β to γ scales numerically because of limited computational resources, stability of calculation, time and cost for computer and exactness of calculation. In this paper, based on these background, we develop the qualitative short-term severe rainfall prediction method using artificial intelligence for practical use in order to apply to river site by forecasting the time series variation of distribution of severe rainfall having a lead time of six hours, automatically.
    土木学会, 2001, 土木学会論文集, 2001(691) (691), 13 - 23, Japanese
    Scientific journal

  • 火山地域におけるGPS測位に及ぼす局地的な水蒸気変動の影響について
    OISHI SATORU
    電気通信学会, 2001, 電子情報通信学会, Vol.J84-B No.12, Japanese
    Scientific journal

  • 片岡幸毅, 大東秀光, 角田 恵, 池淵周一, 中北英一, 大石 哲, 藤田 暁, 高田 望
    2000, 土木学会水工学論文集, 44, 103 - 108, Japanese
    [Refereed]
    Scientific journal

  • Analysis of Temporal and Spatial Change of a Convective Thunder Storm in Tokyo Metropolitan using GPS Precipitable Water : Case Study on 23rd August in 1997.
    OISHI SATORU
    The temporal and spatial relationships between GPS precipitable water vapor (GPS-PWV) and rainfall intensity (RI) on an event of strong convective thunder storm in the Tokyo metropolitan area were investigated. RINEX, one of the standard format of GPS raw data and supplied from Geographical Survey Institute of Japan, were converted to GPS-PWV by GAMIT software on 30 min basis. The following results were obtained ; (1) A rapid increase of GPS-PWV can be observed 1 to 2 hours before a beginning of sever rainfall, (2) The hourly increment of GPS-PWV has a strong correlation with the possibility and amount of increasing of one hour later RI, and (3) GPS-PWV begins to decrease at the peak of RI. These results suggest the promising availability of GPS-PWV as one of the prior-signals of strong convective thunder storms.
    日本気象学会, 2000, Tenki, 47(1) (1), 7 - 15, Japanese
    Scientific journal

  • OISHI SATORU
    土木学会, 2000, Annual Journal of Hydranlic Engineering, JSCE, 第44巻, 67 - 72, Japanese
    Scientific journal

  • OISHI SATORU
    土木学会, 1999, Annual Journal of Hydranlic Engineering, JSCE, 第43巻, 251 - 256, Japanese
    Scientific journal

  • OISHI SATORU
    土木学会, 1998, 水工学論文集, 第42巻, 13 - 18, Japanese
    Scientific journal

  • Numerical Analysis of Effect of Topography on Severe Rainfall in Baiu Se ason using Cumulus Microphysical Model
    OISHI SATORU
    京都大学防災研究所, 1997, Annuals of Disas. Prev. Res. , Kyoto Univ., 40(B-2) (B-2), 307 - 322, Japanese
    Research institution

  • OISHI SATORU
    土木学会, 1997, 水工学論文集, 第41巻(41) (41), 117 - 112, Japanese
    Scientific journal

  • Estimation Method of Probable Maximum Precipitation for Short Duration in Sm all Areas using a Convective Simulation Model
    OISHI SATORU
    京都大学防災研究所, 1997, Annuals of Disas. Prev. Res. Inst. , Kyoto Univ., 40(B-2) (B-2), 245 - 262, Japanese
    Research institution

  • SYNTHETIC OBSERVATION OF ATMOSPHERIC BOUNDARY LAYER IN THE LAKE BIWA PROJECT '95
    田中賢治, 大石哲, 中北英一, 池淵周一
    京都大学防災研究所, Apr. 1996, 京都大学防災研究所年報, (39) (39), 285 - 299, Japanese

  • Numerical Approach on the Effect of Mountainous Topography to Development of Severe Rainfall
    OISHI SATORU
    京都大学防災研究所, 1996, Annuals. Disas. Prev. Res. Inst. , Kyoto Univ., 39(B-2) (B-2), 251 - 269, Japanese
    Research institution

■ MISC
  • 土石流による地形変化と降雨流出・氾濫の予測型シミュレーション
    山野井一輝, 山野井一輝, 大石哲, 川池健司, 中川一
    2021, 砂防学会研究発表会概要集(Web), 2021

  • レーダによる大気上層の降水粒子判別と詳細な雲微物理過程モデルを用いた降雨強度推定
    西田悠史, 中北英一, 山口弘誠, 大石哲
    2020, 土木学会関西支部年次学術講演会講演概要集(Web), 2020

  • STUDY ON DROP SIZE DISTRIBUTION MEASUREMENT IN CLOUD BY USING VIDEO SONDE AND SCALE-RM
    大石 哲, 南郷 脩介, 梶川 義幸, 山浦 剛, 鈴木 賢士, 山口 弘誠, 中北 英一
    土木学会, 2020, 水工学論文集 Annual journal of Hydraulic Engineering, JSCE, 65, Ⅰ_199 - 204, Japanese

  • CALCULATION OF VERTICAL WIND SPEED PROFILE WITH VIDEO SONDE AND CLOUD MICROPHYSICAL ANALYSIS
    大石 哲, 林 直希, 小川 まり子, 梶川 義幸, 中北 英一
    土木学会, 2019, 水工学論文集 Annual journal of Hydraulic Engineering, JSCE, 64, I_1177 - 1182, Japanese

  • 降雪雲の雲物理・降雪種
    荒木健太郎, 村上正隆, 村上正隆, 佐野哲也, 大石哲, 石坂雅昭, 山下克也, 本吉弘岐, 中井専人, 斎藤篤思, 斎藤篤思, 田尻拓也
    2019, 気象研究ノート, (240) (240)

  • 気象レーダー60年の歩みと将来展望 第3章 大学における気象レーダーの研究・利用
    藤吉康志, 上田博, 中北英一, 道本光一郎, 小林文明, 佐野哲也, 大石哲, 砂田憲吾, 小西啓之, 牛尾知雄, 佐藤晋介, 高橋暢宏, 井口俊夫, 渡邊明, 本谷研, 佐々木佳明, 本田明治, 村田文絵, 佐々浩司
    20 Jul. 2018, 気象研究ノート, (237) (237), 84‐157, Japanese

  • Integrated Research on State-of-the-Art Multi-Sensors In-Situ Observation of Storm Genesis and Reduction of Serious Disaster Due to Heavy Rainfall
    Eiichi Nakakita, Satoru Oishi, Kazuhisa Tsuboki, Katsuhiro Nakagawa, Kenji Suzuki, Tadayasu Ohigashi, Kosei Yamaguchi, Mariko Ogawa, Kazuyoshi, Seiji Kawa mura, Yoshiharu Suzuki, Hiroyuki Hashiguchi, Hironori Iwai, Taro Shinoda, Yasutaka Wakazuki, Masayuki K. Yamamoto, Aritoshi Masuda, Tomoo Ushio, Ahoro Ada chi
    Jun. 2018, AOGS, English

  • 気象レーダー60年の歩みと将来展望 第1章 メーカーにおける気象レーダーの開発
    長屋勝博, 浜津享助, 松田知也, 和田将一, 高木敏明, 武地美明, 大石哲, 中北英一
    2018, 気象研究ノート, (237) (237)

  • 偏波レーダーを主としたマルチセンサーによる積乱雲の生成と発達を捉えるフィールド観測
    中北英一, 山口弘誠, 佐藤悠人, 新保友啓, 坪木和久, 篠田太郎, 大東忠保, 大石哲, 小川まり子, 橋口浩之, 川村誠治, 中川勝広, 岩井宏徳, 山本真 之, 鈴木賢士, 相馬一義, 鈴木善晴, 牛尾知雄, 足立アホロ, 若月泰孝
    May 2017, 日本気象学会2017年度春期大会

  • Elpida Kolokytha, Satoru Oishi, Ramesh S.V. Teegavarapu
    Springer Singapore, 01 Jan. 2016, Sustainable Water Resources Planning and Management Under Climate Change, v - vi, English
    Others

  • Elpida Kolokytha, Satoru Oishi, Ramesh S.V. Teegavarapu
    Springer Singapore, 01 Jan. 2016, Sustainable Water Resources Planning and Management Under Climate Change, 1 - 303, English
    Others

  • P130 MPレーダーを用いた霰の電荷量と電場の推定(ポスター・セッション)
    小池 雄大, 大石 哲
    日本気象学会, 2015, 大会講演予講集, 108, 210 - 210, Japanese

  • P322 孤立峰の斜面上に大雨をもたらした対流性降水システムの構造(ポスター・セッション)
    佐野 哲也, 大石 哲, 末次 忠司
    日本気象学会, 2015, 大会講演予講集, 108, 402 - 402, Japanese

  • P335 小型Xバンド二重偏波レーダーを用いた雹の観測(ポスター・セッション)
    早野 真理子, 高木 敏明, 大石 哲, 中北 英一
    日本気象学会, 2015, 大会講演予講集, 108, 415 - 415, Japanese

  • P117 高分解能気象レーダーを用いた都市小河川の水位推定(ポスター・セッション)
    石垣 雄太, 高木 敏明, 大石 哲, 中北 英一
    日本気象学会, 2015, 大会講演予講集, 107, 105 - 105, Japanese

  • P118 2013年夏季における富士山周辺域での降雨分布とその要因について(ポスター・セッション)
    小田切 幸次, 佐野 哲也, 大石 哲, 内山 高, 小林 浩
    日本気象学会, 2015, 大会講演予講集, 107, 106 - 106, Japanese

  • P102 Dual-Doppler法による風速場解析(ポスター・セッション)
    箕輪 昌裕, 高木 敏明, 大石 哲, 中北 英一
    日本気象学会, 2015, 大会講演予講集, 107, 90 - 90, Japanese

  • 沖縄集中観測キャンペーン2007-2014における成果と ビデオゾンデによる雲微物理観測の可能性
    鈴木賢士, 中川勝広, 川村誠治, 相馬一義, 鈴木善晴, 大石哲, 大東忠保, 坪木和久, 橋口浩之, 山口弘誠, 中北英一
    日本気象学会, Oct. 2014, 日本気象学会2014年度秋期大会, 106, 90 - 90, Japanese

  • Application of X-band polarimetric weather radar to estimate volcanic ash amount
    Indri Hapsari, R, Oishi, S, Ogawa, M, Iida, M, Legono, D, Iguchi, M
    Sep. 2014, Abstracts of Cities on Volcanoes 8, English

  • Nakakita Eiichi, Yamaguchi Kosei, Tsuboki Kazuhisa, Ohigashi Tadayasu, Hashiguchi Hiroyuki, Kawamura Seiji, Nakagawa Katsuhiro, Iwai Hironori, Suzuki Kenji, Oishi Satoru, Soma Kazuyoshi, Suzuki Yoshiharu, Ogawa Mariko
    Water vapor that comes to flow from Osaka Bay becomes a cloud in Osaka or near Kobe , move clouds while development along the Yodogawa then , Kyoto, Kameoka heavy rain in July 2012 , and Uzi heavy rain in August 2012 is , northern Osaka I have (called Yodogawa line ) mechanism that brought heavy rain and in Kyoto . In order to capture the generation and development of cumulonimbus series of these , in addition to the polarization radar network of X-band and C-band of the Ministry of Land, Infrastructure and Transport , which are in place in the Kinki , in 2011 , the X-band polarimetric radar that was installed on its own was installed each water vapor observation , at sea coming to flow from Osaka Bay by installing a ferry or buoy RHI observation and deployment that targets the Osaka bay mouth by , cloud observations with millimeter-wave radar , a GPS receiver . I managed to video soundings in the urban areas for the first time in 2012 . In 2013 , I went experimental observation project in cooperation with separately , that RHI synchronization observe the four azimuth every 2 minutes for each Doppler lidar , millimeter wave radar , the X-band polarimetric radar . It performs a vertical cross-sectional comparison on the development of clouds and airflow change , the development of clouds and convergence of air flow corresponds well have been revealed .
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, Sep. 2014, Proceeding of Annual Conference, 27, 100037 - 100037, Japanese

  • P334 ドップラーライダーにより観測された六甲おろしの構造(ポスターセッション)
    岩井 宏徳, 石井 昌憲, 水谷 耕平, Baron Philippe, 中川 勝広, 川村 誠治, 落合 啓, 安井 元昭, 浦塚 清峰, 相馬 一義, 大石 哲, 山口 弘誠, 中北 英一
    日本気象学会, 2014, 大会講演予講集, 105, 310 - 310, Japanese

  • P345 複数のGPS受信機を使用した天頂大気遅延量の解析(ポスター・セッション)
    中 大輔, 大石 哲
    日本気象学会, 2014, 大会講演予講集, 106, 466 - 466, Japanese

  • P342 偏波レーダーと雷探知装置を用いた前線通過に伴う雷と降水セルに関する研究(ポスター・セッション)
    小池 雄大, 大石 哲
    日本気象学会, 2014, 大会講演予講集, 106, 463 - 463, Japanese

  • B367 2014年2月14-15日に甲府盆地にもたらされた南岸低気圧に伴う豪雪の特徴と形成過程(南岸低気圧による大雪:その要因,実態,予測可能性,スペシャル・セッション)
    佐野 哲也, 末次 忠司, 大石 哲
    日本気象学会, 2014, 大会講演予講集, 106, 567 - 567, Japanese

  • P190 超高解像レーダーと移流モデルを用いた降雨予測場に関する研究(ポスター・セッション)
    直原 悠紀子, 大石 哲, 山口 弘誠, 中北 英一
    日本気象学会, 2014, 大会講演予講集, 106, 272 - 272, Japanese

  • Nakakita Eiichi, Suzuki Kenji, Oishi Satoru, Tsuboki Kazuhisa, Kawamura Seiji, Hashiguchi Hiroyuki, Nakagawa Katsuhiro, Suzuki Yoshiharu, Ohigashi Tadayasu, Souma Kazuyohi, Yamaguchi Kosei
    Recently, disaster due to localized heavy rainfall is noticeable under climate change and urbanization. Although prediction accuracy of heavy rainfall in large spatial scale is getting higher and higher, it is still difficult for localized heavy rainfall in smaller spatial scale to be even reproduced. Moreover, earlier detection and prediction of localized and suddenly generated heavy rainfall (so called guerrilla heavy rainfall) are very important, even if the time lag is five to ten minutes. Also, prediction and early warning of flash flood are expected. Under these circumstances, this scientific integrated research aims to execute in-situ campaign observations of precipitation using a video-sonde synchronized with the latest polarimetric Doppler radar which is expected to be effective in the rainfall estimation and prediction. Also, this research aims to develop methodologies for reducing water related disaster.
    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 25 Sep. 2013, Proceeding of Annual Conference, 26, 16 - 16, Japanese

  • P195 ビデオゾンデ及びCバンド偏波レーダーを用いた氷粒子観測(ポスター・セッション)
    小川 まり子, 大石 哲, 中北 英一, 鈴木 賢士, 坪木 和久, 川村 誠治, 中川 勝広, 鈴木 善晴, 大東 忠保, 相馬 一義, 山口 弘誠
    日本気象学会, 2013, 大会講演予講集, 104, 279 - 279, Japanese

  • P114 超高解像レーダーと移流モデルを用いた降雨予測場の誤差評価に関する研究(ポスター・セッション)
    直原 悠紀子, 大石 哲
    日本気象学会, 2013, 大会講演予講集, 104, 198 - 198, Japanese

  • P119 ビデオゾンデと偏波レーダーCOBRAとの同期観測による雲物理情報と偏波パラメータの関係(ポスター・セッション)
    有馬 薫, 鈴木 賢士, 中北 英一, 山口 弘誠, 大石 哲, 相馬 一義, 坪木 和久, 大東 忠保, 中川 勝広, 川村 誠治
    日本気象学会, 2013, 大会講演予講集, 104, 203 - 203, Japanese

  • P132 冬季の南岸低気圧に伴う甲府盆地の降雷の事例解析(ポスター・セッション)
    佐野 哲也, 末次 忠司, 大石 哲
    日本気象学会, 2013, 大会講演予講集, 104, 216 - 216, Japanese

  • D158 夏季に山岳域で長時間維持した積乱雲に伴う豪雨の形成(都市域における極端気象のメカニズム解明,専門分科会)
    佐野 哲也, 大石 哲, 砂田 憲吾
    日本気象学会, 2012, 大会講演予講集, 101, 116 - 116, Japanese

  • D152 最新型偏波レーダーとビデオゾンデの同期集中観測と水災害軽減に向けた総合的基礎研究(都市域における極端気象のメカニズム解明,専門分科会)
    中北 英一, 山口 弘誠, 大石 哲, 鈴木 賢士, 坪木 和久, 大東 忠保, 中川 勝弘, 川村 誠治
    日本気象学会, 2012, 大会講演予講集, 101, 110 - 110, Japanese

  • P121 台風1115号の通過に伴う盆地内斜面上の豪雨の形成(ポスター・セッション)
    佐野 哲也, 大石 哲, 砂田 憲吾, 末次 忠司
    日本気象学会, 2012, 大会講演予講集, 102, 205 - 205, Japanese

  • P312 新型ビデオゾンデ受信機を用いた沖縄梅雨期のビデオゾンデ連続観測(ポスター・セッション)
    鈴木 賢士, 渡邉 涼一, 松尾 翠, 田中 成美, 大石 哲, 相馬 一義, 山口 弘誠, 中北 英一
    日本気象学会, 2012, 大会講演予講集, 102, 486 - 486, Japanese

  • P154 夏季に山岳域で長時間停滞かつ維持した積乱雲を構成する降水セルの振る舞いと構造(ポスター・セッション)
    佐野 哲也, 大石 哲, 砂田 憲吾
    日本気象学会, 2011, 大会講演予講集, 100, 403 - 403, Japanese

  • OISHI Satoru
    This paper introduces the basic theory of advanced weather radar which consists of polarimetric technique and dopplar measurement. Moreover, equations representing the cloud microphysical processes for both precipitation particls development and air mass movement are explained briefly.
    THE JAPANESE SOCIETY FOR MULTIPHASE FLOW, Apr. 2010, 混相流, 第24巻2号pp.154-161(2) (2), 154 - 161, Japanese
    Introduction scientific journal

  • P419 X-バンド二重偏波ドップラーレーダーで観測された夏季に短時間の豪雨をもたらせた降水システムの構造(ポスターセッション)
    佐野 哲也, 大石 哲
    日本気象学会, 2010, 大会講演予講集, 97, 335 - 335, Japanese

  • Study on the effect of disaster prevention education to pupils with considering regionality
    稲垣 意地子, 大石 哲, 砂田 憲吾
    日本自然災害学会, 2010, Journal of Japan Society for Natural Disaster Science, 28(4) (4), 357 - 369, Japanese

  • フィリピン・台風災害調査報告(速報)
    OISHI Satoru
    Jan. 2010, 土木学会誌, Vol. 95, No. 2, pp. 30-33, Japanese
    Others
    Link to Kobe Univ. Repository (Kernel)

  • 2009年フィリピン台風災害調査報告
    OISHI Satoru
    Jan. 2010, 平成21年度河川災害シンポジウム概要集, pp. 38-47, Japanese
    Others

  • Study of comprehend of children's memory constitution for disaster prevention education using a video-story
    INAGAKI Ichiko, OISHI Satoru, SUNADA Kengo, YUMOTO Mitsuko
    This study aims to obtain psychological aspect of children for understanding memories of disaster prevention education materials. For this purpose attitude surveys were conducted. First, a video-story was created from past landslide disaster at Mukawa of Yamanashi Prefecture in 1959. The story contains a lesson about the disaster. From the video-story, the memories of children were analyzed by dividing the video-story into illustrations and narrations. The main finding of analysis shows that a possibility that the illustrations and the narrations of the scenes chosen by children had emotional stimuli (emotional arousal) which made the children's preserve their memories.
    自然災害科学会, 2009, Journal of Japan Society for Natural Disaster Science, 27(4) (4), 401 - 413, Japanese

  • D358 山梨大学X-バンド二重偏波ドップラーレーダーで観測された降水システムの初期観測結果(観測手法)
    佐野 哲也, 大石 哲, 砂田 憲吾
    日本気象学会, 2009, 大会講演予講集, 96, 320 - 320, Japanese

  • 沖縄偏波降雨レーダーCOBRAとビデオゾンデによる同期観測-2009年ビデオゾンデ観測の概要-
    和田華代, 鈴木賢士, 中北英一, 山口弘誠, 大石哲, 坪木和久, 出世ゆかり, 大東忠保, 中川勝広, 川村誠治, 高橋劭
    2009, 日本気象学会大会講演予稿集, (96) (96)

  • 中央アジア・キジルクム砂漠における地表面フラックス観測
    甲山治, 大石哲, 砂田憲吾, 寳馨
    Jun. 2008, 京都大学防災研究所年報(CD-ROM), (51) (51), ROMBUNNO.51B,3, Japanese

  • Study on identification of rainfall particle by using MRR based on cloud microphysical process
    OISHI Satoru, OKUDA Takayoshi
    One of the most important problems to improve the accuracy of rainfall intensity estimation by radar is identification of type of precipitation droplets. The type of precipitation droplets are basically classified into two, ice and liquid. And then, difference of the characteristics of scattering of microwaves among the types of precipitation droplet takes effect to accuracy of rainfall intensity estimation. This study proposes a method to identify the phase of precipitation droplets by using MRR and cloud microphysical processes.
    日本流体力学会, 2008, 日本流体力学会年会講演論文集, 2008, 132 - 132, Japanese

  • Classification of Hydrometeors Using a C-band Polarimetric Radar and Validation by In-Situ Campaign Observation Synchronized with Video-Sonde
    中北英一, 山口弘誠, 隅田康彦, 竹畑栄伸, 鈴木賢士, 中川勝広, 大石哲, 出世ゆかり, 坪木和久
    2008, 京都大学防災研究所年報(CD-ROM), (51) (51)

  • 降水量推定・降水予測の高精度化のための偏波降雨レーダーCOBRAとビデオゾンデによる雲微物理同時観測
    鈴木賢士, 重藤峻介, 井原充貴, 中北英一, 大石哲, 坪木和久, 出世ゆかり, 高橋劭, 中川勝広
    2008, 日本農業気象学会全国大会講演要旨, 2008

  • Zen and Art of Weather Forecasting as a Numerical Science
    OISHI Satoru
    日本計算工学会, 31 Jul. 2007, Journal of the Japan Society for Computational Engineering and Science, 12(3) (3), 1623 - 1626, Japanese

  • Development of 2D numerical model of mudflows for estimation of sediment deposition in volcanic basins
    MIYAZAWA Naoki, SUNADA Kengo, OISHI Satoru
    砂防学会, 15 Jan. 2007, Journal of the Japan Society of Erosion Control Engineering, 59(5) (5), 23 - 34, Japanese

  • Dian Sisinggih, Kengo Sunada, Satoru Oishi
    2006, Annual Journal of Hydraulic Engineering, JSCE, 50, 101 - 106

  • 宮沢直季, 砂田憲吾, 大石哲, 平田学, 廣瀬昌由
    2006, 水工学論文集, 50, 881 - 886

  • C308 レーダーを用いた台風内部のメソ擾乱組織の形成・破壊過程に関する研究(台風)
    浅田 浩之, 大石 哲, 中川 勝広, 坪木 和久
    日本気象学会, 2006, 大会講演予講集, 89, 191 - 191, Japanese

  • 宮沢直季, 砂田憲吾, ペチ ソクヘム, 大石 哲, ディアン シシンギ
    2005, 水文・水資源学会誌, 18(5) (5), 584 - 591

  • 河川・渓流の環境整備のための地域住民の参加の方法に関する研究(2)
    砂田 憲吾, 大石 哲, 中沢 真理子
    水利科学研究所, 2005, 水利科学, 48(6) (6), 64 - 80, Japanese

  • P191 高性能偏波レーダーを用いた台風の発生・発達メカニズムに関する研究
    浅田 浩之, 大石 哲, 砂田 憲吾
    日本気象学会, 2005, 大会講演予講集, 88, 388 - 388, Japanese

  • 佐藤修一, 大石哲, 砂田憲吾, 赤池純
    2004, 水工学論文集, 48, 283 - 288

  • 河川・渓流の環境整備のための地域住民の参加の方法に関する研究(1)
    砂田 憲吾, 大石 哲, 中沢 真理子
    水利科学研究所, 2004, 水利科学, 48(5) (5), 36 - 63, Japanese

  • Debris-flow capturing effect of grid type steel-made sabo dam using 3D distinct element method
    N Miyazawa, T Tanishima, K Sunada, S Oishi
    2003, DEBRIS-FLOW HAZARDS MITIGATION: MECHANICS, PREDICTION, AND ASSESSMENT, VOLS 1 AND 2, 1, 527 - 538, English

  • P238 複数の乱流計測機を用いた乱流熱輸送量空間分布観測の概要 : 琵琶湖プロジェクト2002年集中観測(CAPS)
    石田 祐宣, 樋口 篤志, 田中 賢治, 松島 大, 玉川 一, 浅沼 順, 多田 毅, 小野 圭介, 林 泰一, 岩田 徹, 田中 広樹, 檜山 哲哉, 石川 裕彦, 田中 健路, 松浦 陽介, 朝岡 良浩, 渡辺 浩明, 家本 薫, 鈴木 善晴, 原 耕一郎, 清水 保, 鎌田 雅憲, 大石 哲, 民田 晴也, 山本 宗尚, 松原 卓美, 八田 由紀子, 近藤 善美, 佐藤 暁子, 山根 悠介, 甲山 治, 石岡 賢治, 相馬 一義, 宮田 昇平, 田中 武志, 花房 大輔, 福田 大輔, 西村 吉弘, 伊藤 龍也, 松井 一浩, 吉田 直矢
    日本気象学会, 2003, 大会講演予講集, 83, 338 - 338, Japanese

  • Effect of water vapor on advection of convective rainfall cells around the Lake Biwa, Japan (Copies of English Papers by the 〔Water Resources Research〕Center Staff Published in the Fiscal Year of 2000)
    Oishi Satoru, Ohgita Naoki, Nakakita Eiichi
    京都大学防災研究所付属水資源研究センター, Apr. 2002, 水資源研究センター研究報告, (22) (22), 152 - 157, English

  • GPS大気遅延量を用いた水蒸気擾乱の解析に関する研究
    大石 哲, 中北 英一, 池淵 周一
    京都大学防災研究所付属水資源研究センタ-, 2000, 水資源研究センタ-研究報告, (20) (20), 19 - 27, Japanese

  • Development of the prediction model for acid rain and snow considering the detailed cloud microphysical processes
    大石 哲, 松井 光弘, 池淵 周一
    京都大学防災研究所, 2000, 京都大学防災研究所年報, (44) (44), 395 - 409, Japanese

  • Experimental Study on the Effect of Water Vapor in Boundary Layer on the Atmospheric Delay of GPS.
    大石 哲, 亀岡 知志, 中北 英一, 池淵 周一, 島田 誠一
    京都大学防災研究所, 1999, Annuals of Disas. Prev. Res. Inst. Kyoto Univ., 42(B-2) (B-2), 141 - 151, Japanese

  • Analysis and Prediction of Rainfall for Hydrological Uses
    Nakakita Eiichi, Nakagawa Katsuhiro, Oishi Satoru
    京都大学防災研究所付属水資源研究センタ-, 1998, 水資源研究センタ-研究報告, (18) (18), 257 - 266, English

  • Study on Effects of Updraft on Precipitation Processes Using Two-Dimensional Cumulus Model
    大石 哲, Kitani Yugo, 中北 英一
    京都大学防災研究所付属水資源研究センタ-, 1997, 水資源研究センタ-研究報告, (17) (17), 128 - 135, English

  • Study on Development of a Short Term Rainfall Forecasting Method Using Qualitative Cumulus Model
    大石 哲, 猪阪 昇治, 小尻 利治, 池淵 周一
    京都大学防災研究所, 1997, 京都大学防災研究所年報, (41) (41), 181 - 200, Japanese

  • STUDY ON EFFECTS OF UPDRAFT ON PRECIPITATION PROCESSES USING TWO-DIMENSIONAL CUMULUS MODEL
    OISHI Satoru, KITANI Yugo, NAKAKITA Eiichi, IKEBUCHI Shuichi
    01 Nov. 1996, Journal of hydroscience and hydraulic engineering, 14(2) (2), 81 - 88, English

  • 琵琶湖プロジェクト'95における大気境界層の同期観測
    田中賢治, 大石哲, 中北英一, 池淵周一
    1996, 土木学会第51回年次学術講演会第II部門概要集 , pp. 806-807, Japanese

  • NUMERICAL APPROACH TO EFFECT OF UPDRAFT ON LOCAL RAINFALL
    大石 哲, 木谷 有吾, 中北 英一, 池淵 周一, 高橋 劭
    京都大学防災研究所, Apr. 1994, 京都大学防災研究所年報, (37) (37), p281 - 297, Japanese

■ Books And Other Publications
  • 地域と災害, 北後明彦, 災害から一人ひとりを守る 地域づくりの基礎知識４
    HOKUGO AKIHIKO, OISHI SATORU, OGAWA MARIKO
    Joint work, 神戸大学出版会, Mar. 2019, Japanese
    Scholarly book

  • 気象研究ノート，第241号「南岸低気圧にともなう大雪 III:雪氷災害と予測可能性」，5.2章「2014年2月14-15に南岸低気圧によりもたらされた南岸低気圧にともなう大雪の特徴」
    佐野哲也 大石哲
    Contributor, 気象学会, 2019

  • 災害から一人ひとりを守る
    北後, 明彦, 大石, 哲, 小川, まり子
    神戸大学出版会,神戸新聞総合出版センター (発売), 2019, Japanese, ISBN: 9784909364050

  • 気象研究ノート 第237号「気象レーダー60年の歩みと将来展望」，3.6章「Xバンドマルチパラメータレーダーによる甲府盆地の降水に関する研究」
    SANO Tetsuya, OISHI Satoru, SUNADA Kengo
    Joint work, 日本気象学会, 2018, Japanese
    Scholarly book

  • 気象研究ノート 第237号「気象レーダー60年の歩みと将来展望」，1.4章「小型Xバンド気象レーダーによるマルチレーダーシステム」
    TAKAKI Toshiaki, TAKECHI Yoshiaki, OISHI Satoru, NAKAKITA Eiichi
    Joint work, 日本気象学会, 2018, Japanese
    Scholarly book

  • 気象研究ノート 第236号「都市における極端気象の観測・予測・情報伝達」，3.6章「都市における極端気象の観測・予測・情報伝達」
    SANO Tetsuya, SUNADA Kengo, OISHI Satoru, NAKAMURA Takashi, SUETSUGI Tadashi
    Joint work, 日本気象学会, 2018, Japanese
    Scholarly book

  • Sustainable Water Resources Planning and Management Under Climate Change
    Elpida KOLOKYTHA, OISHI SATORU, Ramesh TEEGAVARAPU
    Joint work, Springer, Oct. 2016, English, ISBN: 9789811020513
    Scholarly book

  • 大阪湾GPSと超高解像度レーダーを用いた大阪湾域の極端気象予測精度の向上に関する研究
    大石, 哲, 京都大学防災研究所
    京都大学防災研究所, 2016, Japanese

  • 震災復興学 第14章地震に伴う土砂災害と市民の減災方法
    OISHI SATORU
    Joint work, ミネルヴァ書房, Oct. 2015, Japanese
    Scholarly book

  • Sustainable water resources planning and management under climate change
    Kolokytha, Elpida, 大石, 哲, Teegavarapu, Ramesh S.V
    Springer science+business media Singapore, English, ISBN: 9789811020490

■ Lectures, oral presentations, etc.
  • SCALEを用いた神戸市の夏季熱環境評価 − その２：神戸市沿岸域における局地循環−
    足立幸穂, 西澤誠也, 大石哲, 富田浩文
    日本気象学会2023年度秋季大会, Oct. 2023, Japanese
    Oral presentation

  • SCALEを用いた神戸市の夏季熱環境評価
    足立幸穂, 佐賀真理子, 大石哲, 富田浩文
    日本気象学会2023年度春季大会, May 2023, Japanese
    Poster presentation

  • FDPSを用いたSPH法による斜面崩壊シミュレーションに関する基礎研究
    野中 沙樹, OISHI SATORU, TAKEYAMA TOMOHIDE, 陳 健
    第21回応用力学講演会, 2018, Japanese, Domestic conference
    Oral presentation

  • 雷探知装置とMPレーダーによる雷機構解明に向けた事例解析
    KOIKE Yudai, OISHI Satoru, OGAWA Mariko
    水文・水資源学会2015年度総会研究発表会, Sep. 2015, Japanese, Japan Society of Hydrology and Water Resarouces, Domestic conference
    Oral presentation

  • 複数のＸバンドＭＰレーダーを用いた富士山周辺の降雨流出過程に関する研究
    YAMAMOTO Kentaro, OISHI Satoru
    水文・水資源学会2015年度総会・研究発表会, Sep. 2015, Japanese, Japan Society of Hydrology and Water Resarouces, Domestic conference
    Oral presentation

  • 桜島における火山灰粒径分布測定に基づいた気象レーダーによる火山灰堆積量推定手法の開発に関する研究
    MURANISHI Masahide, OISHI Satoru, OGAWA Mariko
    水文・水資源学会2015年度総会・研究発表会, Sep. 2015, Japanese, Japan Society of Hydrology and Water Resarouces, Domestic conference
    Oral presentation

  • MPレーダーを用いた霰の電荷量と電場の推定
    KOIKE Yudai, OISHI Satoru
    日本気象学会2015年度秋季大会, Sep. 2015, Japanese, The Meteorological Society of Japan, Domestic conference
    Oral presentation

  • HyperKANAKO Application for Lahar Simulation in Gendol River, Merapi, Yogyakarta,
    Magfira Syarifuddin, OISHI Satoru, NAKATANI Kana, IWANAMI Eiji, Djoko Legono
    Hyper KANAKO研究会サマーセミナー, Sep. 2015, English, Domestic conference
    Oral presentation

  • GPSを用いた大阪湾上の水蒸気移流推定に関する研究
    HAYASHI Kazushige, OISHI Satoru
    水文・水資源学会2015年度総会・研究発表会, Sep. 2015, Japanese, Japan Society of Hydrology and Water Resarouces, Domestic conference
    Oral presentation

  • XMP Radar application to optimize volcanic debris flow measurement in Merapi volcano
    Magfira Syarifuddin, OISHI Satoru, IIDA Masahiro, MURANISHI Masahide, OGAWA Mariko, IGUCHI Masato
    Japan Geoscience Union Meeting, May 2015, English, Japan Geoscience Union, Domestic conference
    Oral presentation

  • Study on efficiency improvement of train dispatch under severe rainfall by using radar
    OSHIRO Tomoki, OISHI Satoru
    The 36th IAHR World Congress, May 2015, English, International Association for Hydro-Environment Engineering and Research, Domestic conference
    Oral presentation

  • Development of Pedestrian Navigation System Using Short-Term Rainfall Prediction on Smartphone
    Rachmad Setiawan Mukti, OISHI Satoru, HOKUGO Akihiko, KITAMURA Takeshi
    Japan Geoscience Union Meeting, May 2015, English, Japan Geoscience Union, Domestic conference
    Oral presentation

  • Rainwater Catchment Systems Under Climate Change: An Assessment of Brazilian and Japanese Cases
    C.O. Galvão, Satoru Oishi, R.L.B. Nóbrega, M.S. Dantas
    34th IAHR World Congress, Jun. 2012, English, IAHR, Brisbane, Australia, International conference
    Oral presentation

  • ENSEMBLE SHORT-TERM RAINFALL-RUNOFF PREDICTION AND ITS APPLICATION FOR URBAN FLOOD RISK MAPPING
    Ratih Indri Hapsari, Satoru Oishi, Kengo Sunada, Tetsuya Sano, Dian Sisinggih
    5th International Conference on Flood Management, Sep. 2011, English, Public Works Research Institute, Tokyo, Japan, International conference
    Oral presentation

  • Ensemble Rainfall Short Term Prediction for Flood Disaster Prevention in Urban River Basin
    Ratih Indri Hapsari, Kengo Sunada, Satoru Oishi
    The 13th International Summer Symposium of JSCE, Aug. 2011, English, Japan Society for Civil Engineers, Tokyo, Japan, International conference
    Oral presentation

  • Estimation of rainfall intensity by using X-Band Polarimetric Radar with raindrop falling trajectory
    Kenta Hasegawa, Shuusuke Suzuki, Satoru Oishi, Tetsuya Sano, Kengo Sunada
    34th IAHR World Congress, Jun. 2011, English, IAHR, Brisbane, Australia, International conference
    Oral presentation

■ Affiliated Academic Society
  • IAHR

  • 砂防学会

  • 米国地球物理学連合

  • 米国気象学会

  • 日本気象学会

  • 水文・水質源学会

  • 土木学会

■ Works
  • 人口急増地域の持続的な流域水政策シナリオ
    2003 - 2008

  • SUNADA CREST
    2003 - 2008

  • アジアモンスーン地域における人工・自然改変に伴う水資源変動予測モデルの開発
    2002 - 2007

  • Research Revolution 2002 (Takeuchi)
    2002 - 2007

  • 社会変動と水循環の相互作用評価モデルの構築
    2001 - 2006

  • TAKARA CREST
    2001 - 2006

  • GPS気象学
    1997 - 2001

  • GPS meteorology
    1997 - 2001

  • 琵琶湖プロジェクト
    1993 - 2001

  • The lake Biwa Project
    1993 - 2001

  • 河川水辺の国勢調査の活用に関する研究
    2000

  • Utilization of River Sensus
    2000

  • 水・人間・地球の相互作用を考慮した持続可能な水資源環境に関する国際水文学研究(ベトナム)
    1999

  • Water-Man-Earth Interactions and Sustainable Water Resources-Cooperation in East Asia and Oceania(Vietnam)
    1999

  • 東南アジア・太平洋地域の流域水利用実態およびデータ環境の国際共同調査(豪州・ニュージーランド)
    1998

  • International Survey on Water Resources Usage and Data Environment of the Basin around South east Asia and Pacific Area(Australia and New Zealand)
    1998

■ Research Themes
  • 災害脆弱性を指標にした土砂災害起源の複合災害の条件付き災害発生確率に関する研究
    大石 哲, 富田 浩文, 竹山 智英, 梶川 義幸, 山野井 一輝, 大谷 英之, 阿波田 康裕
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, Apr. 2021 - Mar. 2024
    本課題では，洪水・土砂複合災害の結果としての浸水災害を対象にして，地域のリアルタイム浸水予測可能性を論じようとしている．具体的には，詳細な降雨分布や個別の斜面崩壊場所に依存して浸水が発生する集落の浸水発生の予測可能性を主な研究対象とし，異なる研究分野で開発されたHPCシミュレーションの手法に観測情報を組み合わせて高度化を実施している．その関係を知識として蓄えることでリアルタイム浸水災害発生を予測する可能性を論じる．具体的には，以下の項目を行ってきた． 土砂洪水氾濫シミュレーションによる土砂災害起源の洪水災害の脆弱性（山野井）：土砂の輸送・堆積過程を含む洪水土砂氾濫解析プログラムを用いて多数の土砂洪水氾濫シミュレーションを実施する仕組みを実装して，スーパーコンピュータ「富岳」を用いて多数シミュレーションを異なる対象地域で実施した． 多数の斜面崩壊シミュレーションによる斜面崩壊時の不安定土砂の量と流下距離の計算（竹山・大石）：斜面崩壊シミュレーションプログラムに地形と地質データを入力して実斜面スケールでの計算を実施する仕組みを実装して，スーパーコンピュータ「富岳」およびOakforest-PACSで計算実行した．詳細な気象シミュレーション（富田・梶川）：平成30年西日本豪雨を対象に大雨発生事例をスーパーコンピュータ「富岳」で詳細に再現して降雨情報提供に目処をつけた．異なるHPCI-IDシミュレーションの連結（大谷・竹山・山野井・大石）：データ処理プラットフォームを用いて高精細気象シミュレーションと洪水土砂氾濫解析を疎結合することを試み，ライブラリの構成，スクリプトを用いてライブラリを活用する方法を取りまとめた．角田地区での斜面崩壊実験によるシミュレーション精度検証（阿波田・竹山・大石）：実施準備をして2022年度の実施計画を立てた．

  • Investigation of the effects of long-term power outage due to the 2019 typhoon Faxai
    Yoshihisa Maruyama
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Special Purposes, Chiba University, Oct. 2019 - Mar. 2021
    A powerful typhoon Faxai, the 15th typhoon in 2019, made landfall in Tokyo’s neighboring Chiba Prefecture around 5:00 a.m. on September 9. It caused severe structural damage especially in the southwestern part of Chiba Prefecture. It also triggered extensive and continued power outage in Chiba Prefecture. Power supply was disrupted at approximately 640 thousand houses in Chiba Prefecture as of 10:30 am on September 9. The power failure continued for about two weeks mainly in the southern part of Chiba Prefecture. In this study, various functional and structural damage caused by this typhoon was investigated. In Japan, it is anticipated that extensive power outages may occur after the Tokyo Inland and the Nankai Trough earthquakes in the near future. This study will be helpful to establish a resilient water supply system against future earthquakes.

  • Development of a new 400MHz radiosonde sensor to measure the electric charge of precipitation particles in clouds
    SUZUKI KENJI
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Yamaguchi University, Apr. 2018 - Mar. 2021
    Knowledge of the electric charge of precipitation particles in thunderclouds is essential for understanding the mechanism of lightning generation. However, there has been no low-cost, easy-to-use meteorological observation device to measure it. Therefore, in this study, we developed a new, compact, lightweight, low-cost, and user-friendly sensor (EC sensor) equipped on the 400 MHz radiosonde. This new EC sensor can be attached to a balloon and released into a thunderstorm cloud, and the amount of positive and negative charge and the number of particles detected by the sensor every second can be monitored on the ground in real time. Although the COVID-19 epidemic prevented sufficient test flights, the new charge sonde was completed through prototype design, ground testing, and the development of data recording software.

  • Integrated Research on State-of-the-art Multi-sensors In-situ Observation of Storm Genesis and Reduction of Serious Disaster due to Heavy Rainfall
    Nakakita Eiichi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (S), Kyoto University, May 2015 - Mar. 2020
    An integrated research has been conducted to mitigate water related disasters caused by localized heavy rainfall and “guerrilla-heavy rainfall”. Multi-sensors observation toward the understanding of storm-genesis and its development was carried out at Keihanshin region and Okinawa. We have identified the structure of pairs of positive/negative vertical vortex tubes at the storm-genesis, and discovered a developing storm possesses a hierarchical structure of the vertical vortex tubes in a sense of spatial scale. Our new findings have activated a new way for the earlier risk prediction system by enhancing its practical utilization, which is one of our great contributions to the society as well as the related research area.

  • 大石 哲
    科学研究費補助金／基盤研究(B), Apr. 2016 - Mar. 2019, Principal investigator
    Competitive research funding

  • 大石 哲
    学術研究助成基金助成金／挑戦的萌芽研究, Apr. 2016 - Mar. 2019, Principal investigator
    Competitive research funding

  • Establishment of an immediate determination method for indicators on eruption scale and strength using data of typical volcano monitoring instruments and weather radars
    NAKAMICHI Haruhisa, OISHI Satoru, YAMADA Taishi, TERADA Akihiko
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Kyoto University, Apr. 2016 - Mar. 2018
    We obtained the seismic and acoustic energies and durations of 2014 and 2015 eruptions of Kuchinoerabujima. We estimated the altitude of the eruption plume by a force at the seismic source and compare with the plume altitude by visual observation for the 2015 eruption. We compared seismic waveforms and tilt changes of eruptions in Japan and clarified common features of the eruptions of Kusatsushiranesan, Ontakesan and Kuchinoerabujima. We detected the radar reflection intensity corresponding to eruption plumes of Sakurajima and Shinmoedake. We estimated the plume height of the Sakurajima eruption on November 13, 2017 as 4 km by using the radar reflection intensity, although the visual plume height was unknown due to bad weather. By comparing the radar reflection intensities of the 2017 and 2018 eruptions of Shinmoedake with the plume altitudes by visual observation, we accumulated the basic data for establishing a method for estimating altitudes of eruption plumes using weather radars.

  • マルチセンサー・ビデオゾンデ同期観測によるゲリラ豪雨タマゴの生起と発達過程の解明
    中北 英一, 坪木 和久, 鈴木 賢士, 大石 哲, 中川 勝広, 橋口 浩之, 牛尾 知雄
    日本学術振興会, 科学研究費助成事業, 基盤研究(A), 京都大学, Apr. 2015 - Mar. 2016
    本基盤研究（A）を内包する基盤研究（S）の採択通知を5月29日に得て、5月29日からは基盤研究（S）としての研究活動に移行している。本基盤研究(A)は3年計画で「豪雨のタマゴの生成過程の研究」を重点的に実施することを目的とするのに対して、基盤研究(S)は5年計画で、本研究内容に加え、都市域で世界初観測となる境界層レーダと最先端レンジイメージングを導入して高時間・空間分解能での境界層観測を実現し、より年数をかけて豪雨のタマゴの生成過程の研究を実施するとともに水災害への応用研究も実施する。 こういった状況の中、4月にはキックオフ研究会を実施し、3年計画の場合、さらには5年計画が実現した場合のそれぞれについて、研究計画や沖縄・ならびに神戸～京都の観測計画の精緻化、共有化を行い、研究のスタートを切った。5月には、本計画で観測情報の利用を想定している別資金による小型レーダの導入に備えて、一部メンバーが新たに第2級陸上特殊無線技士養成課程講習を受講し免許の取得を行うとともに小型レーダの情報の取得体制を整えた。また、気象庁でのメソ気象研究会や日本気象学会専門セッションで本研究計画の紹介を行った。 以上のように、4月～5月にかけて、今年度スタートした基盤研究（A）ならびにそれを内包する基盤研究（S）の計画面、観測面、広報面すべてにおいて研究活動の実質的なスタートを切った。そして、本基盤研究（A）を内包する基盤研究（S）の採択通知を5月29日得て、5月28日で本基盤研究（A）としての活動を終了し、5月29日からは基盤研究（S）としての研究活動を開始した。

  • 大石 哲
    科学研究費一部基金／基盤研究(B)特設, Apr. 2013 - Mar. 2016, Principal investigator
    Competitive research funding

  • 都市域における局所的集中豪雨に対する雨水管理技術実証事業
    大石 哲
    下水道革新的技術実証事業（B-DASHプロジェクト）, 2016, Principal investigator
    Competitive research funding

  • リアルタイム短時間降雨予測技術開発と3次元観測マルチレーダーシステムの実用性検証
    大石 哲
    研究成果最適展開支援プログラム（A-STEP）, 2016, Principal investigator
    Competitive research funding

  • Scientific and Integrated Research by In-situ Campaign Observations Synchronizing Video-sonde and the Latest Polarimetric Radar, Heading for Reduction of Water Related Disaster
    NAKAKITA Eiichi, SUZUKI Kenji, TSUBOKI Kazuhisa, OISHI Satoru, KAWAMURA Seiji, HASHIGUCHI Hiroyuki, TAKAHASHI Tsutomu, KIDO Yoshinobu, TANAKA Kenji, NAKAGAWA Katsuhiro, IWAI Hironori, ICHIKAWA Yutaka, SUGIMOTO Soichiro, SUZUKI Yoshiharu, SHUSSE Yukari, WAKAZUKI Yasutaka, SOUMA Kazuyoshi, OHIGASHI Tadayasu, YAMAGUCHI Kosei
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (S), Kyoto University, Apr. 2010 - Mar. 2015
    An integrated research has been conducted to reduce water related disasters caused by localized heavy rainfall and “guerrilla-heavy rainfall”. During the in-situ observations, newly developed videosonde system was utilized to understand the life stages of convective clouds by synchronizing it with the polarimetric radar. And, another fundamental observations toward understanding storm-genesis was started over heat-island urban, by utilizing multi-sensors observations. Valuable data collected during the in-situ observations provide important information to the consequent researches, such as numerical modeling of cumulonimbus cloud, developing a method of rainfall prediction, and establishing an earlier-alert system. The earlier detection and risk prediction system for guerrilla-heavy rainfall is under test operation by the River Bureau of Japan, for its practical utilization, which is one of our great contributions to the society and the related research area as well.

  • A-STEP「リアルタイム短時間降雨予測技術開発と3次元観測マルチレーダーシステムの実用性検証」
    大石 哲
    科学技術振興機構, 研究成果最適展開支援プログラム 産学共同促進ステージ ハイリスク挑戦タイプ, 2015, Principal investigator
    Competitive research funding

  • A-STEP「リアルタイム短時間降雨予測技術開発と3次元観測マルチレーダーシステムの実用性検証」
    大石 哲
    研究成果最適展開支援プログラム 産学共同促進ステージ ハイリスク挑戦タイプ, 2014, Principal investigator
    Competitive research funding

  • A-STEP「超高時空間分解能を有するリアルタイム降雨予測技術の研究開発」
    大石 哲
    研究成果最適展開支援プログラム シーズ顕在化タイプ, 2013, Principal investigator
    Competitive research funding

  • OISHI Satoru, SUNADA Kengo
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2010 - 2012, Principal investigator
    In the present study, we developed methods, algorithms and computer systems which reduce floods in urban area by optimizing the releasing discharge from smaller reservoir. Specifically, we developed hydrological simulators based on distributed hydrological model in which rainfall information from radar with some extent of error which was quantitatively utilized for giving probabilistic flood forecasting. Then, an optimized method was applied for flood control using reservoir with stochastic flood forecast. First, a probabilistic method for short term rainfall forecast was achieved by using radar echo extrapolation method with singular vector for making probabilistic ensembles. Then, a hydrological model which also deals with probabilistic spread based on generalized likelihood uncertainty estimation (GLUE). Second, an optimized control algorithm using Dynamic Programming has been applied for flood control by using reservoir. In the present study, we use Stochastic Dynamic Programming (SDP) for dealing with weekly ensemble weather forecasting issued from Japan Meteorological Agency (JMA). In the SDP, objective function was minimizing the water level at a point in lower river basin. The result of the SDP with weekly ensemble weather forecasting made water level reduced and the objectives of the present study has been achieved.
    Competitive research funding

  • A-STEP「超高時空間分解能を有するリアルタイム降雨予測技術の研究開発」
    大石 哲
    研究成果最適展開支援プログラム シーズ顕在化タイプ, 2012, Principal investigator
    Competitive research funding

  • Improvement of Rainfall Estimation and Rainfall Prediction Using the Next Generation Polarimetric Radar and Its Impact Evaluation for Water Management
    NAKAKITA Eiichi, OISHI Satoru, TSUBOKI Kazuhisa, SUZUKI Kenji, KAWAMURA Seiji, TAKAHASHI Tsutomu, TANAKA Kenji, NAKAGAWA Katsuhiro, ICHIKAWA Yutaka, SUGIMOTO Souichiro, SUZUKI Yoshiharu, SHUSSE Yukari, OHIGASHI Tadayasu, YAMAGUCHI Kosei
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Kyoto University, 2007 - 2009
    With a view to improve quantitative precipitation estimation and forecast for river control, the campaign observation of the next generation polarimetric radar synchronized with videosonde were carried out in Okinawa. As the result, the method of estimation of the drop size distribution and the type of precipitation particles using the polarimetric radar data was developed. Moreover, the advanced techniques of QPE and QPF were brought to realization by applying the estimation method to the numerical weather prediction, or by deeply understanding of precipitation mechanism.

  • Development of Sedimentation Tracking Method based on Quantitative and Qualitative Component of River Bed
    KENGO Sunada, SATORU Oishi, FUTABA Kazama, KEI Nishida, NAOKI Miyazawa
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), University of Yamanashi, 2006 - 2008
    本研究では,流入土砂量の他に礫種構成比,X線回折法を用いた細粒土砂の鉱物構成比,細粒土砂の粒径分布比を用いた土砂生産源の追跡方法を開発してきた. また,微地形,土地利用状況,雨滴衝撃エネルギーを考慮して新たな2 つのタイプの土砂生産モデルを開発した.

  • Formulation of precipitation、 atmospheric environment and water circulation model based on cloud physics experiment
    YAMADA Tadashi, FUJIYOSHI Yasuji, OHTA Yukio, OHISHI Satoru
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Chuo University, 2005 - 2008
    雲物理過程解明のために行った実験よりエアロゾル量の増加に伴い雲水量も増加するがエアロゾル量が閾値を超えると生成される雲水量が一定になり飽和状態になる。また上昇風速が大きくなればなるほど雲水量が増加することがわかった。ヒートアイランドを緩和させる効果のある河川周辺で行った微気象観測により河川の大きさに関わらず水面付近の気温は周囲より低く、河川上の冷気が運ばれやすい風道がある場所の気温は2~3℃周囲より低いことがわかった。

  • 気候変動と都市化を考慮した豪雨災害リスク算定に関する研究
    大石 哲
    日本学術振興会, 科学研究費助成事業, 若手研究(B), 山梨大学, 2004 - 2006
    本研究では数10分から数時間程度の可能最大降水量の算出を試み,それが気候変動や都市化に与えている影響について考察した.本研究で得られた最大の成果は,実測の雨滴粒径分布の鉛直プロファイルデータを解析することによって,降雨の時間スケール特性を規定している特徴を捉えることに成功したことである.すなわち,1時間を超える時間スケールの降雨を対象にした場合には,降雨量は上空雨水量の総量と正のよい線形相関関係を持つこと,および1時間未満の時間スケールの降雨を対象にした場合には,降雨量は落下速度の鉛直プロファイルによって規定されていることを見いだした.特に,1時間未満の時間スケールの降雨は上空1000mから400mにおける雨滴の落下速度の変化が多きときに降雨量が大きくなる関係を用いて,可能最大降水量を定量化した.一方,1時間を超える時間スケールでは上空雨水量の総量はTRMM-TMIによって算出可能であることを示して,その定量化手法を特定するところまでを検討した. 温暖化ガスの排出に伴う気候変動では,気温上昇によって空気中の水蒸気許容量を増加させたところに上空冷気塊による冷却で水滴化するために上空雨水量が増加し,1時間を超える時間スケールの可能最大降水量は増加するというシナリオが考えられるが,それはTRMM-TMIを使った検討を待たなくてはならない.また,都市化によって高層ビルが増加すると局地風系が形成されることによって,上空1000mから400mでの雨滴の落下速度の変化は大きくなることが予想されるので,1時間以内の時間スケールの可能最大降水量が増大することが考えられるが,それも詳細な数値計算の解析を待つ必要がある.

  • Data assimilation of advanced precipitation radar to meso-scale numerical simulation and its application for rainfall and flood prediction
    NAKAKITA Eiichi, TANAKA Kenji, TSUBOKI Kazuhisa, OISHI Satoru, NAKAGAWA Katsuhiro, SUZUKI Yohiharu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kyoto University, 2004 - 2006
    Many kinds of precipitation processes including convective rain and stratiform rain was observed by COBRA, 400MHz WPR and ground based rainfall observation devices in 2004 (baiu season, typhoon season) and in 2006 (baiu season, typhoon season, fall and winter season). The collected data have been used for investigation and development of cloud microphysical processes including analysis of rain drops size distribution (DSD), vertical profile of DSD, evaluation of polarimetric parameter of COBRA, and development of algorithms for DSD above melting layer by 400MHz WPR. Effectiveness of polarimetric parameters of multi parameter Doppler radar “COBRA" including horizontal radar echo (ZH), vertical radar echo (ZV), differential reflectivity (ZDR) and specific differential phase shift (KDP) has been investigated. Then effectiveness of linear depolarisation ratio (LDR) was shown by comparison of observed parameters and parameters estimated parametrically non-from DSD that was obtained by disdrometer observation. Moreover, a rainfall rate estimation method has been built and evaluated by considering the polarimetric parameters. Extended Karman filter, ensemble Karman filter and four dimensional variation method have been applied to original hydrostatic numerical simulation model in order to develop assimilation methods for polarimetric parameters to cloud resolving numerical simulation. Then, it is found that ensemble Karman filter was the best way to assimilation. Meso scale processes inside typhoons were new point of view to investigate the growth and movement of typhoon. Therefore, analysis of COBRA data and numerical simulation were conducted. Then, eye wall corruption by impact of convective cell to eye wall organization was found by the analysis of COBRA data. Wind field simulated by CReSS was also analyzed for corruption of eye wall organization. Especially vorticity and divergence of horizontal wind was focused. These results were reported and will be used in the second stage that is grant-in-aid for scientific research (A) from 2007 to 2009.

  • 「アジアにおける水物質循環モデル・ソフトウェアに関する国際フォーラム」の企画調査
    山田 正, 立川 康人, 大石 哲, 田中 賢治, 田中 岳, 山坂 昌成
    日本学術振興会, 科学研究費助成事業, 基盤研究(C), 中央大学, 2005 - 2005
    1.WORKSHOP [Recent Development of Water Resources and Hydrology](ベトナム) 上記博覧会の趣意と成果を広く国内外に発信するために、2005年5月には日本学術会議内に設置されたアジア学術会議主催の「The 5^ Science Council of Asia(SCA) Conference」において、アジア学術会議委員である本研究代表者が同ワークショップを開催した。同ワークショップでは、我国の水物質循環モデル開発の経緯、現状の取り組みを述べ、アジア諸国の大学・研究機関、財団、民間企業へ我国の水物質循環モデル・ソフトウェアに対する将来構想を示した。さらにアジア諸国が抱える水資源問題について意見を交換し、水物質循環モデル・ソフトウェアの開発を各国協力して進めることにより国際的な水資源問題の解決の原動力となす意思を確認した。同ワークショップの報告を受けアジア学術会議は、アジア地域における水資源問題の国際的・将来的重要性を認識し、アジア学術会議における水文セッションの常設を決定した。 2.水物質循環モデル・ソフトウェア博覧会2005 本研究代表者らは、国内外の水物質循環に関連するモデル・ソフトウェアの開発と精度の向上を図るとともに、これらの成果を国内外に発信することで、わが国の国際貢献の一助となることを目的として同博覧会を2005年12月に企画した。国内外の大学・研究機関、財団、民間企業から30ブースの出展と500名を超える来場者があり、水物質循環モデル・ソフトウェアの現状の問題点及び今後の方向性についての議論が盛況に行われた。 この博覧会に出展されたモデル・ソフトウェアについて、モデル・ソフトウェアカタログとして日本語・英語版の冊子となってまとめられている.

  • Comprehensive research on water, energy, and material cycle by synchronizing satellite, intensified, and continuous observations -The Lake Biwa Project 3rd stage
    NAKAKITA Eiichi, OISHI Satoru, EBISU Nobuhiro, TANAKA Kenji, HIGUCHI Atsushi, IWATA Toru
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), KYOTO UNIVERSITY, 2001 - 2003
    The intensive field campaign of the areal distribution of turbulent fluxes (CAPS2003) was implemented on the harvested paddy field by the members of the Lake Biwa Project and other young scientists from the flux research group. The 30 participants came from 11 universities and institute. The observation was organized by permanent energy balance measurement station, one Doppler lidar (3-dimensional distribution of wind and aerozol), two Doppler sodars (vertical profile of wind), one scintillation meter (path average sensible heat flux), GPS sonde (vertical profile of temperature, humidity, and wind), 4 super flux sites (sensible and latent heat fluxes, radiation budget), 4 sat sites (sensible heat flux), 3 flux profile sites (vertical profile of sensible heat flux), 24 thermocouples (fluctuation of air temperature). Furthermore, to estimate the distribution of energy balance components, radiometer and thermometers were installed at the same place for calibration. The main characteristics of this CAPS2003 is that the target area (200m x 100m) is much smaller than that of CAPS2002 (1200m x 500m). The arrangement of the sensors was "cross-shape", and all data from sensors in the central zone were recorded by one 64ch logger. This perfect synchronizing aims to the tracking of the detailed structure of the turbulent flow. All the processed (quality checked) data from CAPS2002 and CAPS2003 were included in the database and opened on the Web site. As for the numerical modeling, the non-hydrostatic meteorological model ARPS and the advanced land surface scheme SiBUC were coupled. By the grid-nesting system from the synoptic scale to the local scale, the detailed local wind field was simulated and the effects of the land surface processes on the local circulation were analyzed in detail. Also, the dataset of the distribution of the energy and water budget components in the Lake Biwa Basin was re-constructed by the off-line simulation of the improved land surface model SiBUC.

  • Joint Field Survey for Promoting the Integrated Manila Bay-Laguna Lake and Surrounding Watersheds Environmental Study Project
    NADAOKA Kazuo, NIHEI Yasuo, OISHI Satoru, URASE Taro, HARII Saki
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Tokyo Institute of Technology, 2001 - 2002
    1) Field survey on hydraulic and water quality environments in Manila Bay-Laguna Lake coupling system and development of numerical simulation models Intensive field surveys were performed at Manila Bay, Laguna Lake and Pasig River in 2001 October (wet season), at Laguna Lake in 2002 February (dry season) and at Manila Bay 2003 February (dry season). With these surveys, the characteristic features of the hydraulic and water quality environments in these periods were clarified. Especially, the importance has been revealed for the effects of the spatial non-uniformity of the wind field on Laguna Lake, the environmental loads from the tributaries of the Pasig River through the Metro Manila area, the 3-D structure of the currents in Manila Bay and others. Further, by conducting a long-term continuous field measurement at Laguna Lake and Pasig River for the period from March to June, 2002, it was succeeded in observing the phenomenon that the brackish water from Manila Bay intrudes into the Laguna Lake in the end of the dry season. In addition to these field surveys, it was also attempted to develop numerical simulation models for currents in Manila Bay and Laguna Lake, respectively. For the former, with the basis of dual-sigma POM, a 3-D current model by Nadaoka & Nihei, nesting techniques and the effect of non-hydrostatic pressure distribution were examined. For the latter, on the other hand, a field survey to examine the hydrodynamic effects of the fishpen was conducted in Laguna Lake in 2003 March. 2) Field survey on distributions and sources of heavy metals in relation to surrounding watersheds Analyses have been made for the existing samples of bottom mud taken in Manila Bay and newly obtained bottom mud samples taken in Pasig River and Laguna Lake, revealing the characteristic distributions of various heavy metal components and their possible source areas. Special attention has been paid on the lead, as its distribution may show appreciable human effects. As one of the possible sources of the lead, roadside dust was sampled and analyzed. 3) Numerical simulation of mudflow in Mt. Pinatubo watershed area A two-dimensional numerical model of mudflow was developed and applied to the watershed area of Mt. Pinatubo, giving reasonable results.

  • GPSとマルチパラメータレーダーを用いた豪雨の詳細な構造解析
    大石 哲
    日本学術振興会, 科学研究費助成事業, 奨励研究(A), 山梨大学, 2000 - 2001
    降雨時の水蒸気動態を主としてGPS,マルチパラメータレーダー,メソ気象モデル,雲解像数値モデルによって解析した. ・X-BAIU98, 99の解析 1998年梅雨期に長崎県橘湾周辺,1999年梅雨期に鹿児島県甑島列島で行われた降雨観測実験データのうち,GPS, 2重偏波レーダー,雲解像モデルを用いて主として小規模水蒸気擾乱について考察した.その結果,小さなスケールの線状エコーのような水蒸気のコントラストが比較的明確な対流性降雨の場合には,雲解像モデルの出力結果とGPS位相残差データはよい対応関係を示し,その変動量は大気遅延量で10〜20mm/10分程度であることが示された. ・琵琶湖における解析 1998, 1999年に琵琶湖周辺で生起した局地豪雨現象をGPS, 3次元レーダー,メソ気象モデル,雲解像モデルを用いて,主として降雨生起後の移流方向について考察した.そこでは,GPS可降水量の絶対値が少ないときでは,雨域の移動は下層の可降水量収束方向に進むこと,可降水量の絶対値が大きいときでは,雨域の移動方向は可降水量の収束方向に依存しないこと,メソγスケールの水蒸気変動をシミュレーションによって捉えるためには,モデルの水平スケールを1km以下にしなくてはならないことが示された. ・GPSつくば稠密観測の解析 2000年につくば市周辺で行われた稠密観測結果を気象庁気象研究所/数値予報課非静力学モデル(MRI/NPD NHM),雲解像モデルを用いて,主として雲中の雨滴粒径分布と小規模水蒸気変動について考察した.その結果,雲内の水蒸気変動は雨滴粒径分布の増大に伴う下降風の発生によって減少するが,雲の発達に伴って生じる潜熱放出による鉛直上昇風の発生によって増大することが示された.すなわち,雨滴粒径分布および潜熱放出量を適切に推定する必要がある.

  • Development of flood control supporting system based on Severe Rainfall prediction system using Artificial Intelligence (SRAI)
    IKEBUCHI Shuichi, TANAKA Kenji, NAKAKITA Eiichi, KOJIRI Toshiharu, OISHI Satoru, HORI Tomoharu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), KYOTO UNIVERSITY, 1999 - 2001
    The purpose of this research is in making the flood control support system, and the application of this to an actual flood. The accuracy improvement of Severe Rainfall prediction system using Artificial Intellige nee (SRAI) which is the kernel of the system was done became indispensable for that. SRAI is the method to qual itatively forecast the breaking out and development of the rainy cloud of small area and short term, by using the radar, the GMS image, and the numerical prediction data as an initial value. It was difficult for GPV to achieve the forecast accuracy improvement time because it used the data from RSM (Regional Spectral Model) as an initial value. Then, the forecast value of the NHM (Meteorological Research Institute/ Numerical Prediction Division Non Hydrostatic Model), which was the next generation numeric meteorological model (5km space resolution every hour) was introduced, and the improvement of the forecast accuracy was aimed at. The accuracy of rainfall forecast of two-three hours has been improved. In addition, because the improvement of the rainfall forecast accuracy was able to be expected, the mixing ratio of "cloud water" and "rain water" which NHM forecast was made to be used as an initial value of SRAI in the process of the research on the accuracy improvement, has been used. Therefore, SRAI in the present stage is a system which can forecast the rainfall for a short time by taking, and processing all information on NHM. However, because a lot of time had been spared to development, the application case was not able to be increased. It will be assumed to be a problem to improve reliability to the user by increasing the application case in the future. It has pride that making an application for the forecast by a numeric meteorological model to the management site in the river and the reservoir by overcoming the problem of NHM (The rainfall of 100 % cannot be forecasted, necessary of highly meteorological knowledge is necessary for the interpretation, and a large amount of data) by using NHM at the end is a big result in this research.

  • Continuous Operation of Storage Reservoir using Virtual Reality Technology
    KOJIRI Toshiharu, OKUDA Masahiro, OISHI Satoru, HORI Tomoharu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B)., KYOTO UNIVERSITY, 1998 - 2000
    1) According to the knowledge level for reservoir operation, we proposed the knowledge acquisition process to find abnormality of weather situation and acquire the new information or countermeasure. The data of typhoon path, rainfall, and runoff characteristics are classified and added into knowledge base after integration with fuzzy set concept. 2) Hyetograph and hydrograph are predicted through fuzzy-neuro prediction combined with fuzzy inference theory and neural network. Hydrograph was predicted with two approaches ; one was application of predicted hyetograph and the other was direct application of only observed inflow. Moreover, the acquired knowledge level was represented through the information theory. 3) The virtual reality concept was introduced into the operation instructions where the panel operation, gate control and controlled results at upper or downstream points were reproduced with three-dimensional graphical system. The trainee can understand the real operation results of storage reservoir in control office. 4) All of programming was applied to be structured with Visual C++ on personal computer. This software will support to make the proposed program compact and effective. As we obtained the monitored data different from the real-time data, the real application was not taken in this research.

  • Water-Man-Earth Interactions and Sustainable Water Resources-Cooperation in East Asia and Oceania
    IKEBUCHI Shuichi, KOBATAKE Shigeki, SHIIBA Michiharu, KOJIRI Toshiharu, OISHI Satoru, KAZAMA So
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A)., KYOTO UNIVERSITY, 1998 - 2000
    Problem regarding water, which is associated with population increasing, environmental change, development ofindustry and climate change, is very important for sustainable development of human being. We strongly and systematically promote an international cooperative research for solving the water problem of the target area by gatherins a lot of hydrological researchersunder name of AP-FRIEND. 1. We held three meetings at which many Japanese and non-Japanese researchers gathered. The meeting was held at Teague in Korea (November 7- 17, 1998), Nangjing in China (October 18-21, 1999) and Christchurch in New Zealand (November 18-27, 2000). At these meetings, discussions regarding database of hydrological observation data at eastern Asia and Oceania as well as total river basin management including flood and drought. 2. We support the Japan-Vietnam cooperative research by sending Japanese hydrological researchers to Mekong delta from March 5-12, 1999. The researchers surveyed river hydrological database at Vietnam. At the same time, they investigate the effect of human activity on the sedimentation and environment of the Mekong River. 3. We invited a Korean researcherto Japan and we dispatch Japanese researchersto Vietnam, Thailand, Australia and New Zealand to discuss the comparative hydrology and cooperative research. The subjects are as follows, cooperative research far scaling up problem off flood model, cooperative research for effect of vegetation change on flood volume, vegetation activity survey and cooperative research for effect of human activity and change of environment and climate on water resources.

  • 地表面過程が局地豪雨に与える影響に関する観測及び数値実験的研究
    大石 哲
    日本学術振興会, 科学研究費助成事業, 奨励研究(A), 京都大学, 1998 - 1999
    主として山岳地で生起する局地的集中豪雨についてその地形条件が豪雨生起後の降雨の時・空間分布に与える影響を導くことによって,実時間での降雨予測のための知見を提供することを目的に以下の観測および数値実験を行った.これにより,本研究で計画していた観測データの収集,数値モデルの開発とそれを用いたシミュレーション,および解析が達成された. 観測 6月22日〜7月3日にかけて九州南西部にて行われたX-BAIU99およびGPS気象学の合同観測に参加し,地形の影響を受けていない鹿児島県甑島列島にてGPS,地上気象測器,ラジオゾンデ,レーダーによる測地・気象観測を行った.それによって,豪雨時の海洋上における水蒸気の移流や相変化量を考察する基礎資料を収集した. 計算1 小規模水蒸気擾乱の変動特性をGPS視線方向大気遅延量から算出するためフーリエスペクトルを用いた方法を考案し,それを1998年の琵琶湖プロジェクトにおけるGPS,1次元風速分布観測データに適用し,方法の妥当性を検証した. 計算2 1998年梅雨期に長崎橘湾周辺で観測されたラジオゾンデ,レーダーデータと3次元雲解像モデルを利用して,豪雨時の水蒸気変動状況を再現した. 解析 上記の観測および計算方法と計算結果を利用して,豪雨時の水蒸気変動を考察し,豪雨をもたらす対流性降雨およびその周辺の層上性降雨が水蒸気変動に与える影響は異なっていることが,数値計算によって示された.観測データを詳細データに検討することによって,豪雨が水蒸気擾乱に与える影響はGPS可降水量や,視線方向大気遅延量を用いることによって,観測可能であることが示された.

  • Study on the long distance transportation of acid snow and its effect on runoff processes
    IKEBUCHI Shuichi, TAKARA Kaoru, FUSHIMI Hiroji, UEDA Hiromasa, TOMOMURA Mitsuhide, OISHI Satoru
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), KYOTO UNIVERSITY, 1998 - 1999
    In the project, study on the acid snow in the northern part of the Lake BIWA has been done. In the study, transportation, reaction and deposition processes are modeled both physically and chemically. Then the cloud microphysics model that considers the chemical processes of acid snow has been developed. We verify the models by comparison with water quality observation. We also developed the model of runoff process which consists of snow fall, snow storage, snow melt, penetration processes. Finally we also verify the model by comparison with observed data. Development of the numerical model of acid snow : Cloud numerical model that includes the explicit type cloud microphysical processes has been developed based on cloud model made by Oishi. Then we consider the generation and deposition processes of SOx and NOx diagnostically. We obtained the result that the mixing ratio of SOx and NOx is quite bigger than observed data. Therefore, we are now in process of development of the model which prognosticate the chemical transportation processes. This model is one of the best models in the world since it can calculate the distribution of cloud droplet diameter that is very important factor for chemical processes. Modeling of Acid snow runoff process and its application to basin scale : We had the important observation period and routine measuring system in very small basin (5.4 Km^2) for making the model of acid snow runoff process. Then we made the application of the models for considering a basin scale by using a water quantity model, a water quality model, a hybrid model and a multi layer model. We obtained the result that the daily variation of snow melting, decreasing of pH by acid shock, daily variation of pH in the river is well explained.

  • Water Use and Date Environment in Southeast Asia and the Pacific
    IKEBUCHI Shuichi, OISHI Satoru, HORI Tomoharu, TAKARA Kaoru, TAKEUCHI Kuniyoshi, KOJIRI Toshiharu
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for International Scientific Research., KYOTO UNIVERSITY, 1997 - 1997
    Studies have been carried out for the sustainable and sound water resources environment in Southeast Asia and Pacific region. The studies are as follows : (1) Many researchers gathered from Southeast and the pacific region surveyed the representative basins to investigate natural and social conditions and water use in the countries. Also investigated are : the exsistence of hydro-meteorological, water demand/use and socio-economical data, their format, quality and accessibility and as well as preparedness for establishment of database management systems in each country. The similarity and difference of the important water issues are clarified through meetings and site visitings in : Thailand and Lao (December 1997), Australia and New Zealand (March 1998) and Malaysia and Indonesia (March 1998). (2) The data regarding hydrology and water resources in the above mentioned countries has been collected. The researchers held technical discussion on how to collect the data regarding hydrology and water resuources in the countries and proposed the design of database management system, data format for common use. (3) In addition, based on the results of surveys, information exchange, collected data and discussions, a workshop regarding establishment of water archive and comparative studies on hydrology and water resources has been held in order to obtain the clear vision for future research.

  • Analysis and Prediction of Local Heavy Rainfall in Mountainous and Urban Area
    IKEBUCHI Shuichi, OISHI Satoru, OHTA Nobuhito, NAKAKITA Eiichi, MITSUTA Yasushi
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), KYOTO UNIVERSITY, 1995 - 1997
    In this project, investigators have proposed the severe rainfall prediction system as well as they have analyzed the local heavy rainfall. The analysis of local heavy rainfall has been done by twoapproaches. First, investigators observed several severe reinfall events mainly with radio sonde and rain gage under condition of severe rainfall in Baiu. Second, investigators developed a cumulus cloud model which has terrain following coordinate and detailed microphysics model. Using the model, investigators simulate severe rainfall events. The processes and result of the analysis is as follows ; 1) Hydrological and meteorological observations have been done under condition of severe rainfall which came mainly from Baiu fronts at the Kuzuryu river basin in Fukui Prefecture. Observation period is June 20-30,1996 and July 2-10,1997. Observations have been done with radio sonds (two to three hourly), optical and normal rain gage (once par one to ten minutes), car bone X band radar (continuous). 2) Numerical cumulus model which has detailed cloud microphysics have been computed with observation data as initial and verification data. Investigators analyze the effect of topography, wind field, atmospheric and thermodynamic stability and water vapor on cloud microphysical processes which control the cumulus generation and dissipation. As results of the analysis, investigators obtained results that the amount of hail generation is important factor for rainfall amount from cumulus. Moreover, they found that water vapor and vertical wind are important factor for hail generation. 3) Investigators proposed that GPS is suitable observation system for water vapor observation. Moreover, they developed a new equation system in order to obtain the water vapor disturbance of cumulus scale using GPS.Investigators found that the equation system made good results using numerical simulation data. They also investigated efficiency of the equation system using observed GPS data. Investigation found that the equation system is effective under good observation condition. They also found that the observation data are affected by many kind of error sources. Finally, the vertical wind field observation by Doppler radar and water vapor observation by GPS are proposed as a effective observation system for severe rainfall prediction.

  • 降雨の3次元構造を考慮したレーダーを用いた地上雨量の推定
    中北 英一, 大石 哲, 池淵 周一
    日本学術振興会, 科学研究費助成事業, 基盤研究(C), 京都大学, 1996 - 1996
    レーダー雨量計の有効性については様々なところで議論されている.しかし,レーダー雨量計を用いて地上における降雨強度や総降雨量の推定を行う際の様々な問題があり,十分な精度が得られていないのが現状である.その原因の一つとして,雨滴粒径分布が降雨の種類によって変化し,その鉛直分布も変化することがあげられる.落下する雨滴粒径分布の変化を雨滴の分裂・併合・蒸発などの微物理過程を考慮したモデルで表現したり,指数分布で雨滴粒径分布を表現し,その分布の傾きを降雨強度によって分類するなどの試みは行われている.しかし,それらの結果とレーダー雨量推定精度向上とは必ずしも結びついていない.申請者らはこれらの問題を根本的に解決するために降雨タイプに依存した形で雨滴粒径分布の鉛直構造を考慮したレーダー雨量推定手法の構築を目指し,実際に地上と鉛直方向の雨滴粒径分布を観測・解析することにより降雨タイプに依存した雨滴粒径分布パラメータとその鉛直分布を明らかにすることを試みた.鉛直方向の雨滴粒径分布の観測は,雨滴の落下速度のドップラースペクトルから雨滴粒径分布を推定することが可能な京都大学超高層電波研究センターのMUレーダー(Middle and Upper Radar)を用いて行った. 地上における雨滴粒径分布については,降雨タイプ別の定式化を行った.降雨期間中に降雨タイプがあまり変化しない梅雨前線に伴う降雨に関しては定式化を行うことができたが,台風性,秋雨前線などの降雨タイプでは降雨期間中に,より小さい時・空間スケールの降雨タイプが変化するために今回用いた降雨タイプによる定式化では十分に雨滴粒径分布を表現することができないことが明らかになった.対流性,層状性などのより小さな時・空間スケールでの降雨タイプによる定式化を行う必要である. 鉛直方向の雨滴粒径分布については,指数分布で推定されるパラメータの鉛直分布を時系列で追跡することによって,時々刻々変化する降雨タイプの雨滴粒径分布の鉛直分布をとらえることができ,その降雨タイプは10分程度で変化しており,定式化には10分間の平均値で行うことができることを示した.

  • Applications of Geographic Information Systems and Remote Sensing to Analysis and Prevention of Water-Related Disasters in Urban Areas
    TAKARA Kaoru, OISHI Satoru, CHIKAMORI Hidetaka, HORI Tomoharu, NAKAKITA Eiichi, OKA Taro
    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), KYOTO UNIVERSITY, 1995 - 1996
    l)Using simulation images degraded from remote sensing images acquired in the Shonai River basin, Takara and Oka have quantitatively investigated the effects of spatial resolution on land cover classification accuracy, a vegetation index NDVI and evapotranspiration estimates based on NDVI.Takara also has constructed a distributed flood runoff model for the Yada River basin and investigated the performance of the model with regard to spatial resolutions of 50m and 250m based on a 50-m digital elevation model as well as parameter values, which were obtained on the basis of a l0-m land use map and remote sensing images. 2)Oka, Takara and Chikamori have made datasets of river stage and precipitation in the Ogura experimental basin. Conducting detailed surveying through topographical maps, aerial photographs and site visiting, they also have made datasets for geographic information such as rivers, artificial drainage channels, pipe lines for water supply and sewage, roads, delineation of land use and contour lines, with GIS. 3)Nakakita has made datasets for precipitations in Kinki and Kyushu acquired radar raingage systems. Investigating a one-year sequence of spatial rainfall distribution acquired at five-minute intervals by the Kunimisan Radar Raingage System in Kyushu, he has found out a strong linear relationship between rainfall and topography (elevation) and proposed a stochastic model of rainfall distribution. 4)Hori has integrated a GIS with a computer model, which can simulate the changing process of inhabitants' attitude on flood disaster due to their experience and time passage. The model is applied to a historical flood event in Nagasaki. 5)For urban storm drainage, Chikamori has proposed a method of optimal operation of pumping systems based on the predicted water stage at pumping stations. 6)Introducing the GPV (Grid Point Value), which is numerically forecasted by the Japanese Meteorological Agency, and the AMeDAS information into GIS,Oishi has developed the qualitative cumulus model using a qualitative reasoning technique to simulate or forecast severe rainfall at local scale.

  • 情報工学的推論手法を用いた局地豪雨予測手法の開発に関する研究
    大石 哲
    日本学術振興会, 科学研究費助成事業, 奨励研究(A), 京都大学, 1995 - 1995
    気象情報から気象現況を定性的に推論するアルゴリズムとルールを作成し、それを計算機中で表現し,実際の豪雨現象に適用してケーススタディを行うことでアルゴリズムの検証を行うことを目標に以下の研究を行った. 1.気象庁・数値予報出力値であるGPV(Grid Point Value)を用いて前線の位置を判断するアルゴリズムを開発した.このアルゴリズムは気象現象に詳しい人間が前線の位置を判断する手法を模して,事例毎に変化するGPVの値を相対的に判断して事例毎に適当なしきい値を判断して2値化を行うことにより前線を抽出する機能を備えている.さらに,アルゴリズムの検証段階において人間が空間的に分布している数値を判断する際には全領域の値の分布具合を判断して空間をいくつかに分解し,その中で前線を抽出して最後にそれぞれで求められた前線を結合していることが判明した. 2.偏微分方程式により表現されている大気の連続式を通して,GPVで得られるメソαスケールの風の情報から地形の影響を受けて生起するメソγスケールの鉛直風分布を求める定性モデルを開発し,その実現を行った.ここで得られた鉛直風分布と大気の安定度,および水蒸気の供給状況が局地豪雨をもたらすような積雲の生起を予測する推論材料である.また,この定性モデルの開発は,診断的解法ではあるが,今まで常微分方程式系だけが定性推論モデルとなることが可能であったという壁を乗り越えて偏微分方程式系も定性モデル化する手法を提案するものである. 3.積雲の数値シミュレーションを通して局地豪雨をもたらすような積雲の生起・発達に影響を与える種々の定量・定性的要因を獲得し,それらを実際の局地豪雨予測に活用するために1次元定性積雲モデル,それを2次元に拡張した2次元定性積雲モデルの基礎的フレームを考案した. これらの研究を行う上で,特に大量のデータを必要とするGPVの解析に際して,計算機の主記憶装置,外部記憶装置を拡張したことが研究の進捗に非常に効果的に機能した.

  • 水文循環モデルのスケールアップ・ダウンと水資源システムへの応用
    池淵 周一, 大石 哲, 立川 康人, 宝 馨, 中北 英一, 椎葉 充晴
    日本学術振興会, 科学研究費助成事業, 一般研究(B), 京都大学, 1994 - 1995
    水文循環のスケールアップおよびスケールダウンを考えるに当たって鍵となるのは,地形,蒸発散量および降水量分布のそれである。一方ではstbchasticな議論も非常に重要である。すなわち,平均的な物理量が互いにどういう関係にあるかを様々なスケール毎に個別に議論するだけでは現象を理解したことにはならず,スケール間の関連および相違が説明づけられなければならない。さらには,洪水防御計画や水質源計画に対する降水量分布や水位,流量のstochasticな構造の情報は,今や実用上欠くことのできないものとなっている。以上が,大気との相互作用という視点以外に,水文プロパ-の水循環のモデル化において考慮されなければならない点である。 本研究は以上の視点をベースに,水文循環モデルのスケールアップ・ダウンと水資源システムへの応用を一貫した課題として取り組むための突破口となるべく,イ)流域特性のメッシュ集中化によるマクロ水文モデルの開発,2)降雨分布の時空間分布特性の物理-確率過程モデルの開発,3)大気-降水-土壌・湖面-地表・地中・地下水流出-蒸発散の相互作用の観測,モデリグ,4)雲の存在を重視した降水過程のモデル化と観測,5)地形情報のスケールアップ・ダウンと流出モデルのそれに蒸発散および降水分布特性が及ぼす影響の明確化,6)種々の時間,空間スケールで得られる水文情報の洪水防御計画,水資源計画への活用手法の開発,7)地上および衛星リモートセンシング情報の有効利用手法の開発,を各研究者が連携しながら進めたものである。本研究は,「水文循環モデルのスケールアップ・ダウンと水資源システムへの応用」を完全に確立する事を目指したのではなく,その展望や突破口を具体的に形で示すことにあった。各課題一貫してこれから進むべき方向を研究成果として具体的に示せたことにより,突破口としての役割を果せたと言える。

  • 陸域の影響を詳細に考慮した局地的豪雨分布特性の解析
    中北 英一, 大石 哲, 椎葉 充晴, 池淵 周一
    日本学術振興会, 科学研究費助成事業, 一般研究(C), 京都大学, 1994 - 1994
    本研究で行ったことは,相互に関連しながらも以下の5つに分類される. 1.土地利用スケールが地上からの熱・水フラックスに及ぼす影響:都市,植生を取り込んだ詳細な熱収支モデルを開発し,それを用いた数値実験によって,土地利用スケールと平均顕熱・潜熱フラックスとの関係を明らかにした. 2.地上からの熱・水フラックスが降雨分布に及ぼす影響:陸面過程,降雨モデルを含んだ数値モデルを用いて,都市化に伴う地上からの顕熱フラックスの局所化,土壌水分量の局所化が降雨を発生させるかどうかの解析を行い,豪雨発生の可能性を見いだした. 3.上昇気流が積雲の発達に及ぼす影響:山岳斜面による強制上昇流を想定し,微物理過程を含んだ積雲数値モデルを用いて,初期鉛直上昇流と積雲の発達度合い,もたらされる降水量との関係を明らかにした. 4.地形分布が降雨分布に及ぼす影響:鹿児島豪雨のレーダー観測情報を用いて,どの程度大きなスケールになると降雨分布特性と地形分布特性が大きく関連してくるかを,雨域の発達・衰弱量の時間的・空間的持続性を指標に調査し,1日程度の時間スケールで見た場合は,20km程度の平均スケールになると関係が顕著に現れることを見いだした. 5.降雨予測:レーダー情報と数値予報結果を結合させた短時間降雨予測手法を開発するとともに,情報工学的手法を用いた局地降雨予測手法の開発を行った. 6.降雨が流出系の及ぼす影響のモデル化:任意の流域でこの影響を評価することを容易にするために,流出系の構造的モデル化を図った.

  • 災害時の水資源問題
    Competitive research funding

  • 降雨観測と降雨予測を基礎にした洪水土砂災害予測警報システムの開発
    Competitive research funding

  • 効果的な防災教育に関する研究
    Competitive research funding

  • 雲物理過程を考慮した豪雨の発生・発達予測
    Competitive research funding

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