Directory of Researchers

OISHI Satoru
Resaarch Center for Urban Safety and Security
Professor
Civil Engineering / Architecutre and planning / Building Engineering
Last Updated :2022/04/15

Researcher Profile and Settings

Affiliation

  • <Faculty / Graduate School / Others>

    Resaarch Center for Urban Safety and Security
  • <Related Faculty / Graduate School / Others>

    Faculty of Engineering / Department of Civil Engineering, Graduate School of Engineering / Department of Civil Engineering, Graduate School of Maritime Sciences / International Maritime Research Center, Center for Computational Social Science (CCSS)

Teaching

Research Activities

Research Interests

  • Radar
  • Hydrometeorology
  • Water Resources
  • Disaster Mitigation

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Hydroengineering
  • Natural sciences / Atmospheric and hydrospheric science

Published Papers

  • Magfira Syarifuddin, Ratih Indri Hapsari, Djoko Legono, Satoru Oishi, Hanggar Ganara Mawanda, Nurnaning Aisyah, Makoto Shimomura, Haruhisa Nakamichi, Masato Iguchi

    © Published under licence by IOP Publishing Ltd. Since 2015, collaborative research conducted by Indonesian and Japan scientists has initiated the installation of small X-band Multi-Parameter (X-MP) radars to mitigate the occurrence of rainfall-induced lahar in three active volcanoes in Indonesia and Japan: Merapi, Sinabung, and Sakurajima. This paper discusses the technical aspects of data acquisition, processing, and performance of the X-MP radar at the Merapi and Sakurajima volcanoes by comparing the estimated rainfall intensity acquired by the radar to three empirical radar-rainfall algorithms. The algorithms are based on radar reflectivity factor (ZHH), specific differential phase shift (KDP), and differential reflectivity (ZDR). A new method of Constant Altitude Plan Position Indicator (CAPPI) interpolation by linear regression is also proposed for a more efficient computation. The first algorithm by Marshall-Palmer, which relies on ZHH, gave the lowest average and maximum rainfall values compared with the other algorithms for all rainfall event cases. On the other hand, the other two algorithms, which involve the MP of radar by Bringi and Chandrasekar and Park et al., gave closer rainfall intensity values with the estimated rainfall intensity acquired by the X-MP radar. These three rain rates give a closer temporal fluctuation when they are compared to the rain gauge-based rainfall intensity.

    11 Feb. 2020, IOP Conference Series: Earth and Environmental Science, 437 (1)

    [Refereed]

    International conference proceedings

  • Ratih Indri Hapsari, Bima Ahida Indaka Sugan, Dandung Novianto, Rosa Andrie Asmara, Satoru Oishi

    © Published under licence by IOP Publishing Ltd. The aim of this study is to develop lahar hazard vulnerability as a warning system by introducing radar-rainfall observation to data mining technique of Naïve Bayes Classifier (NBC). NBC is used to estimate lahar occurrences based on the posterior probability of rainfall, topographic factor, soil moisture, and soil type as predictors. Rainfall intensity and working rainfall were obtained from a weather radar. The soil moisture is derived from SMAP satellite imagery. A river on Mount Merapi, a very active volcano in Indonesia, was selected as the target basin. Observed rainfall and recorded lahar events in Gendol River from October 2016 to February 2018 were divided into a training dataset and a testing dataset. Qualitative evaluation through visual assessment of the hazard map product reveals that the model could estimate the occurrences of lahar. The performance of the model in terms of accuracy, Brier score, and quantitative dichotomous quality indices showed a reasonable skill. The study suggests that the NBC technique is advantageous for estimating lahar occurrences that are displayed on hazard maps. This work is expected to contribute to debris flow hazard mitigation by the data mining approach in volcanic regions.

    11 Feb. 2020, IOP Conference Series: Earth and Environmental Science, 437 (1)

    [Refereed]

    International conference proceedings

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

    © 2019 Elsevier Ltd Through quantitative measurement of the accuracy and the convergence of error, code verification can objectively assess the quality of a simulation code. A lack of analytical benchmark solution for nonlinear problems makes it difficult to verify soil dynamics simulations in geotechnical engineering. To overcome such difficulty, this study makes use of a novel code verification technique, the method of numerically manufactured solutions (MNMS). By utilizing MNMS, the accuracy of a simulation code for nonlinear soil dynamics problems was measured. The orders of the convergence rate of the errors, with respect to the spatial and to the temporal discretization, were found to be in good agreement with the theoretical orders of the numerical methods. By demonstrating the applicability of MNMS for verifying nonlinear soil dynamics simulations, it is hoped that the concept and the necessity of code verifications can be appreciated for simulations of geotechnical engineering problems.

    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), 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), I_1165 - I_1170, English

    [Refereed]

    Scientific journal

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

    © 2019 Elsevier B.V. Effective and efficient liquefaction hazard assessment is critical in making disaster mitigation plans for urban regions. In this paper, we present a numerical-simulation (NS)-based method for assessing urban-wide liquefaction hazard. The method includes an automatic modelling for individual sites and an application of high-performance computing (HPC) for efficient assessment. The feasibility of the method is demonstrated by conducting simulations for more than 10,000 individual sites in an urban region. The urban-wide assessment results depend on a pressure threshold of liquefaction occurrence and the dependence increases as the ground motion increases. A comparison with a conventional method using engineering indices (EI) shows a tendency of the EI-based method to predict a considerably greater number of liquefied sites than the proposed method. With the continuing improvement on numerical simulations and on computer efficiency, NS-based assessments can be regarded as promising alternatives to conventional EI-based methods for urban-wide liquefaction assessment.

    14 Aug. 2019, Engineering Geology, 258 (14), English

    [Refereed]

    Scientific journal

  • Ratih Indri Hapsari, Satoru Oishi, Magfira Syarifuddin, Rosa Andrie Asmara, Djoko Legono

    © 2019, Fuji Technology Press. All rights reserved. Lahar flow is recognized as among the worst secondary hazards from volcanic disaster. Intense rainfall with long duration is frequently associated with lahar flow. In this study, estimation of a rainfall threshold likely to trigger lahar flow is presented in the first part. The second part discusses its implementation by assessing the growth of observed and predicted rainfall, including the uncertainties. The study area is Merapi Volcano, one of the most active volcanoes in Indonesia, including rivers on the flank of Mount Merapi that are vulnerable to debris flow. The rainfall indices needed to describe the conditions that generate lahars or not were determined empirically by evaluating the hourly and working rainfall using X-band multiparameter (X-MP) weather radar. Using past records of lahar flow, the threshold lines separating rainfall that triggers lahars or not were analyzed for the Putih, Gendol, Pabelan, and Krasak Rivers. The performance of several critical lines was evaluated using Bayesian probability based on skill rates from a contingency matrix. The study shows that the line intercept of the critical lines after a significant eruption in 2010 was higher than those lines developed before 2010, indicating that the rivers are currently at lesser risk. Good representation was shown by the thresholds verified with actual rainfall progression and lahar event information on February 17, 2016, at the Gendol and Pabelan Rivers. These rainfall critical lines were the basis for judging the debris flow occurrence by analyzing the track record of predicted rainfall progression. The uncertainty of rainfall short-term prediction from the extrapolation model was evaluated by perturbing the advection vector of rain echo motion. This ensemble forecast product could provide a plausible range of prediction possibility as assistance in gaining the confidence with which a lahar could be predicted. The scheme presented herein could serve as a useful tool for a lahar early warning system in the area of the Merapi Volcano.

    Aug. 2019, Journal of Disaster Research, 14 (5), 811 - 828

    [Refereed]

    Scientific journal

  • Ratih Indri Hapsari, Masahiro Iida, Masahide Muranishi, Mariko Ogawa, Magfira Syarifuddin, Masato Iguchi, Satoru Oishi

    © 2019, Fuji Technology Press. All rights reserved. This paper reports a preliminary attempt to determine volcanic ash particle size distribution using the video drop size detector (VDSD) for estimating volcanic ash amount with X-band radar. The VDSD records an image showing the size and number of particles falling into the aperture by a charge coupled device camera. Size distribution spectra of a range of particles from fine ash to small lapilli were derived in discrete form from the VDSD observation. The parameterization of the particle size distribution following Gamma function was done using volcanic ash of eruptions at the Sakurajima Volcano between December 13-21, 2014. Three Gamma distribution parameters were determined analytically. The analytical results revealed a continuous distribution of particles characterized by shape, intercept, and slope. The distribution was used to determine volcanic mass concentration, ground deposit weight, and reflectivity. Verification of these results with X-band radar observations showed that the reflectivity obtained from analytical results is similar to that fromradar observation. However, the ground deposit weight from analysis was overestimated, compared with the real weight of ash deposit on the ground. The algorithm proposed in this study is expected to provide a practical method for estimating ash distribution in the aftermath of a volcanic eruption using radar-reflectivity for cases where direct measurement at the location is not possible. An overview of the algorithm for volcanic ash retrieval from X-band radar observations is also presented.

    Feb. 2019, Journal of Disaster Research, 14 (1), 151 - 159

    [Refereed]

    Scientific journal

  • Magfira Syarifuddin, Satoru Oishi, Ratih Indri Hapsari, Jiro Shiokawa, Hanggar Ganara Mawandha, Masato Iguchi

    © 2019, Fuji Technology Press. All rights reserved. This paper presents a theoretical method for estimating volcanic ash fall rate from the eruption of Sinabung Volcano on February 19, 2018 using an X-band multi-parameter radar (X-MP radar). The X-MP radar was run in a sectoral range height indicator (SRHI) scan mode for 6◦ angular range (azimuth of 221◦ –226◦) and at an elevation angle of 7◦ to 40◦ angular range. The distance of the radar is approximately 8 km in the Southeastern direction of the vent of Mount Sinabung. Based on a three-dimensional (3-D) image of the radar reflectivity factor, the ash column height was established to be more than 7.7 km, and in-depth information on detectable tephra could be obtained. This paper aims to present the microphysical parameters of volcanic ash measured by X-MP radar, which are the tephra concentration and the fall-out rate. These parameters were calculated in a two-step stepwise approach microphysical model using the scaled gamma distribution. The first step was ash classification based on a set of training data on synthetic ash and its estimated reflectivity factor. Using a naïve Bayesian classification, the measured reflectivity factors from the eruption were classified into the classification model. The second step was estimating the volcanic ash concentration and the fall-out rate by power-law function. The model estimated a maximum of approximately 12.9 g·m−3 of ash concentration from the coarse ash class (mean diameter Dn = 0.1 mm) and a minimum of approximately 0.8 megatons of volcanic ash mass accumulation from the eruption.

    2019, Journal of Disaster Research, 14 (1), 135 - 150

    [Refereed]

    Scientific journal

  • Roby Hambali, Djoko Legono, Rachmad Jayadi, Satoru Oishi

    © 2019, Fuji Technology Press. All rights reserved. Rainfall monitoring is important for providing early warning of lahar flow around Mt. Merapi. The X-band multi-parameter radar developed to support these warning systems provides rainfall information with high spatial and temporal resolution. However, this method underestimates the rainfall compared with rain gauge measurements. Herein, we performed conditional radar-rain gauge merging to obtain the optimal rainfall value distribution. By using the cokriging interpolation method, kriged gauge rainfall, and kriged radar rainfall data were obtained, which were then combined with radar rainfall data to yield the adjusted spatial rainfall. Radar-rain gauge conditional merging with cokriging interpolation provided reasonably well-adjusted spatial rainfall pattern.

    2019, Journal of Disaster Research, 14 (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), 5 - 23, Japanese

    [Invited]

    Research institution

  • Özgen Ilhan, Martin Bruwier, Jiaheng Zhao, Dongfang Liang, Pierre Archambeau, Benjamin Dewals, Kenichiro Kobayashi, Satoru Oishi, Reinhard Hinkelmann

    © The Authors, published by EDP Sciences, 2018. The integral porosity shallow water model is a type of porous shallow water model for urban flood modeling, that defines two types of porosity, namely a volumetric porosity inside the computational cell and a conveyance porosity at each edge. Porosity terms are determined directly from the underlying building geometry, hence buildings do not need to be discretized exactly. This enables simulations with significantly reduced CPU time on meshes with cell sizes larger than the building size. Here, the macroscopic model view leads to an additional source term at the unresolved building-fluid interface, yielding a building drag dissipation source term. In literature, several formulations for this term can be found. The integral porosity shallow water model is sensitive to the building drag dissipation, and using the drag parameters as a calibration parameter enhances the accuracy of model results. However, the ideal way to achieve this is still an open research question. In this contribution, we present a simple technique to estimate building drag dissipation that uses the conveyance porosity configuration to estimate the projected area inside the cell, which is then used in a drag force equation. The advantage of this approach is that it is computationally inexpensive, no additional parameters need to be stored, and only a single parameter has to be calibrated. The proposed approach is compared with drag dissipation formulations from existing literature in a laboratory experiment that features a dam-break against an isolated obstacle. The aim of the comparison is to evaluate present existing building drag dissipation models with regard to accuracy and computational cost.

    05 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

    © The Authors, published by EDP Sciences, 2018. After three hours of intense rainfall, the city of Nice was flash flooded on October 3, 2015, resulting in casualties and severe damages in property. This study presents a porous shallow water-model based numerical simulation of the flash flood event in a district of Nice, and compares the results with a high-resolution conventional shallow water model. This contribution aims to discuss practical aspects of applying a porous shallow water model to a real world case. The porous shallow water model is an integral porosity-type shallow water model. It uses unstructured triangular meshes. The conventional shallow water model is a distributed memory parallelized high-performance computing code, that uses a uniform Cartesian grid. The study site is an approximately 5 km2 spanning district of the city of Nice, France. Topography information is available in a 1m resolution and in addition, the available digital elevation model includes inframetric structures such as walls and small bridges. In the presentation of the case study, challenges of the pre-processing step of the integral porosity shallow water model are addressed. Notably, a method to semi-automatically generate "good" triangular meshes using the open-source geoinformation system QGIS and the mesh generator Gmsh is presented. During the post-processing step, the results of the porous model are mapped back onto the high-resolution topography to make the results more meaningful. The agreement between the high-resolution reference solution and the porous model results are poor. A speed up of about 10 to 15 was observed for the present case.

    05 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

    © Proceeding of the 21st LAHR-APD Congress 2018. All rights reserved. X-band weather radar has considerable potential for its fine spatio-temporal resolution which is significant in the hydrological simulation. In this study, we evaluate the distribution variability of precipitation observation from X-band radar and network rain gauges in Upper Konto River Basin Indonesia which is originated from Kelud volcano. The rainfall spatial representativeness and the temporal variability of X-band radar vs. nine rain stations are compared during the observation campaign in the rainy season of February 2017. The evaluation of spatial distribution characteristic uses Kagan interpolation method in minute scale, hourly, and daily total volume of precipitation. In order to study the impact on the catchment size, the outlet of the basin in Selorejo Reservoir (235.58 km2) is used. Performance of the BTOPMC physically distributed hydrological model using 150 m resolution radar-rain was evaluated over that of using lower resolution from rain gauges. The analysis reveals that widely spread gauges give lower spatial correlation and larger error for the smaller scale of time. The advantages of X-band observation for detecting the variation of rainfall in the small area leads to better reproducibility of flood simulation, shown by RMSE of 9.85 and 7.78 m3/s for rain gauge and radar respectively. It means the radar-rainfall input could give better reproducibility of runoff simulation. It is proven that the radar provides better representativeness of rainfall spatial and temporal variation for operational runoff simulation. which is important for daily as well as seasonal reservoir operations.

    01 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

    © Proceeding of the 21st LAHR-APD Congress 2018. All rights reserved. Flood warning systems have become increasingly necessary to reduce hazard risk, especially lahar flow disaster. An effective lahar flow early warning system should provide information timely, thus allowing sufficient waiting time to respond. As an input to the lahar flow early warning systems, short-term rainfall information derived from a rainfall nowcasting model is needed. To select an appropriate nowcasting method, determining the patterns of historical data through its statistical properties is necessary. Some analyses of historical data can be used to find the trends that are further extrapolated forward. This study aims to analyze the statistical properties of short-term rainfall time series in the area of Mt. Merapi in order to find historical data patterns. The statistical properties of short-term rainfall time series were investigated through autocorrelation and spectral analyses. Several rainfall data with 2-minutes and 10-minutes time interval obtained from XMP Radar estimation have been adopted to determine the autocorrelation coefficient and spectral density. Collerogram was used to evaluate the characteristics of autocorrelation coefficients. The results show that there is high autocorrelation coefficient variability between locations within the radar coverage area, and no time lag between XMP radar rainfall and rain gauge rainfall for 10-minutes time-scale.

    01 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

  • 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), 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), 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), 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), 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), English

    [Refereed]

    Scientific journal

  • Tetsuya Sano, Satoru Oishi

    © The Author(s) 2018. To elucidate the formation of localized rainfall in a basin with heat and aridity under a weak synoptic disturbance in summer, we described the characteristics of atmospheric conditions on the Kofu Basin preceding the appearance of primary precipitating cells from 23 localized rainfall events on the Kofu Basin on days of weak synoptic disturbance at the surface from 1 June to 30 September in 2012 to 2014. Furthermore, on the basis of a case study of an event on 25 July 2014, the formation of the atmospheric conditions was described from the standpoint of moisture behavior. Owing to the thermal contrast between the Kofu Basin with heat and aridity and the outside environment, the south-component wind blowing in the valley connecting to the coastal region of Suruga Bay and the eastcomponent wind blowing in the valley connecting to the Kanto Plain entered the basin as southwesterly wind and southeasterly wind, respectively, which caused an increase in the water vapor mixing ratio and a slight decrease in temperature at the surface. Thereafter, the amount of precipitable water vapor derived from the global navigation satellite system observations (GNSS-PWV) in the central region of the Kofu Basin increased abruptly after the moderate increase in GNSS-PWV at all the observation points in the basin. Finally, a cloud appeared over the local region between the southwesterly wind and the southeasterly wind and precipitating cells appeared at that location at 3.25 to 6.25 km above sea level. We discussed the moisture transport into the Kofu Basin, the concentration of that moisture in a local region, and the appearance of precipitating cells. This is an example of the formation of atmospheric conditions leading to localized rainfall in a basin with heat and aridity.

    2018, Journal of the Meteorological Society of Japan, 96A (A), 95 - 117, English

    [Refereed]

    Scientific journal

  • 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), 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), I_167 - I_178, Japanese

    [Refereed]

    Scientific journal

  • Magfira Syarifuddin, Satoru Oishi, Djoko Legono, Ratih Indri Hapsari, Masato Iguchi

    © 2017 Elsevier Ltd After the 2010 eruption, more than 50 volcanic debris flow (lahar) events occurred during the rainy season of 2010–2011 at Mount Merapi, Indonesia. The lahars occurred following rainfall of severe intensity in the upstream area, where remaining volcanic material was deposited. Estimation of rainfall-induced lahars at Mt. Merapi is difficult and uncertain because the upstream area is dangerous and inaccessible. On 17 February 2016, a lahar occurred in the upstream region of the Gendol River on the southeastern flank of Mt. Merapi after a maximum rainfall intensity of 69 mm/h was monitored on the peak of Mt. Merapi by X-band multi-parameter (X-MP) radar. In this study, rainfall intensity estimates from X-MP radar were applied to generate boundary discharge of a numerical model of debris flow at the catchment scale. The numerical simulation was able to estimate volcanic debris flow occurrence and magnitude. The reliability of radar-rainfall data and the effects of the sabo dam on reducing the impacts of lahar disaster were also examined. The numerical lahar simulation showed relevant results that were comparable to the real condition. The closed type sabo dam caused more than 50% lahar sediment decrement and a flow delay time of 40 min. However, the sediment accumulation has caused increasing flow velocity and higher erosion rate in the 2D area. This study demonstrated the effectiveness of remote monitoring of rainfall combined with numerical debris flow modeling for applied practical use in disaster management.

    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), I_229 - I_234, Japanese

    [Refereed]

    Scientific journal

  • 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), I_165 - I_175, Japanese

    [Refereed]

    Scientific journal

  • KOIKE Yudai, OISHI Satoru, OGAWA Mariko

    Japan Society of Civil Engineers, Mar. 2016, 土木学会論文集B1(水工学), 72 (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), 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), 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), 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), 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), 294 - 304, Japanese

    Research institution

  • Satoru Oishi

    © 2017 Springer Science+Business Media Singapore. Flood control is one of the most important issues of reservoir operation. Rivers in island countries like Japan, the Philippines, and Indonesia that have smaller reservoirs than continental countries need short-term reservoir operation for flood control. In Japan, typhoons give dominant amount of water to reservoirs. Prior releasing of water that makes effective use of the capacity of a reservoir requires the forecast of rainfall amount (hyetograph). Therefore, weather forecast of typhoons is indispensable for flood control. Oishi and Masuda (Study on optimization of the integrated dam operation using ensemble prediction in the upper reaches of the Nabari River. In: Proceedings of 35th IAHR world congress (IAHR), Chengdu, 2013) developed the reservoir control operation model using stochastic dynamic programming with one-week ensemble weather forecast. One-week ensemble forecast consists of 51 members, gives many kinds of weather variables including rainfall amount, and has a lead time of one week. In fact, the frequency of updating one-week ensemble forecast is a problem for using it. Therefore, a solution for the problem is proposed. For giving highly frequent updating, we propose to use typhoon ensemble forecast which issues four times a day, but it does not include rainfall amount. By using a similarity index with observed typhoon tracks and latest ensemble forecast result, a method to give reasonable typhoon ensemble forecasted rainfall amount has been developed. Showing the techniques and theories for managing water resources using advanced weather forecasting, we discuss about the possibility of adaptive countermeasure to manage the water resources by making the most of existing structure.

    IAHR, 01 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

    © 2015, Fuji Technology Press. All rights reserved. The present study shows the possibility of using Xband multi-parameter radar to detect volcanic tephra for estimating the amount of volcanic tephra in the air even when the amount of volcanic tephra is very low. The model proposed in this study can detect tephra with diameters of 0.5mmto 3 mm. Through the observation experiment and the model proposal, the present study shows successful detection of volcanic tephra in the air by using X-band multi-parameter radar.

    Fuji Technology Press, 2016, Journal of Disaster Research, 11 (1), 43 - 52, English

    [Refereed]

    Scientific journal

  • Mariko Ogawa, Satoru Oishi, Kosei Yamaguchi, Eiichi Nakakita

    We evaluated a method by which to fit gamma distributions with parameters of snowflake size distributions by measuring three physical quantities using an optical sensing disdrometer. The three physical quantities are the diameters of the snowflakes that have 50 and 99 percentiles of volumes (D50 and D99, respectively) and the sum of the sixth powers of the diameters in a unit volume (Z). Snowflake size distribution was well fitted to a gamma distribution between D50 and D99, inclusive. This method prevented the snowflake volume from being considerably underestimated. Although the mean absolute error based on snowflake volume for this method was large compared with that obtained using a moment method, good estimates of snowflake volume were obtained for some samples using this method, for which the snowflake size distribution was less influenced by snowflakes 1 mm or less in diameter. The correlation coefficient was 0.989, as determined by regression analysis based on the observed and estimated snowflake volumes using this method. The estimation of the snowflake volume using this method depends on the quality control of the optimum shape parameter and requires a continuous probability distribution of snowflakes for diameters above 1 mm.

    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

    Recently, the frequency of severe rainfall increases in Japan. The average of annual frequency of severe rainfall which is defined as rainfall having more than 50mm within one hour has become increase from 168 times per year (TPY) during the year of 1976-1986 to 226 TPY during 1999-2010 (Japan Meteorological Agency, 2012). The increasing of frequency of severe rain raise risk of sediment related disaster and inundation disaster. Trains especially local train run on reclaimed land and mountainous area have risk of such disasters when severe rain might happen. Therefore, railway companies take many kinds of countermeasures. The present study deals with the dispatching problem under severe rainfall. Each train dispatching system has defined a threshold of rainfall amount where dispatchers stop trains or they command to reduce the speed of trains. A Japanese railway company has measured the rainfall amount by their own rain gauges that locate almost every 13km and it is very difficult to change the measurement system because the company has a historical rainfall data by which the threshold of rainfall amount has been defined. On the other hand, the company has an interest for introducing radar rainfall information for dispatching trains because of increasing of severe rainfall having small spatial scale and efficiency improvement for collecting rainfall data. Many railway companies have the similar contradiction. The present study shows a statistical analysis of the uncertainty to use radar for capturing severe rainfall by using probability function of difference between rainfall amount measured by rain gauge and one by radar.

    IAHR-INT ASSOC HYDRO-ENVIRONMENT ENGINEERING RESEARCH, 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, 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, English

    [Refereed]

    International conference proceedings

  • 佐野哲也, 末次忠司, 大石哲i

    土木学会, Feb. 2014, 土木学会論文集B1(水工学), 70 (4), 889 - 894, Japanese

    [Refereed]

    Scientific journal

  • Reni Sulistyowati, Ratih Indri Hapsari, Fadli Syamsudin, Shuichi Mori, Satoru T. Oishi, Manabu D. Yamanaka

    © 2014, the Meteorological Society of Japan. A 1-month-long observation of the Ciliwung River, which flows through Jakarta in Indonesia, has revealed evidence of the persistent existence of a diurnal cycle in the water level of a tropical river. This was consistent with the diurnal cycle in rainfall observed by meteorological radar and five rain-gauge stations. The river's diurnal cycle was distinguishable from the effects of oceanic and atmospheric tides and has a locally time-locked 1-day periodicity and an amplitude of 0.05 m. The day-to-day variation in the amplitude of the river's diurnal cycle was smaller than the diurnal cycle of the rainfall.

    Meteorological Society of Japan, 2014, Scientific Online Letters on the Atmosphere, 10 (1), 141 - 144, English

    [Refereed]

    Scientific journal

  • 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

    Urban river basins are vulnerable to floods due to intense rainfall, and hence posing a danger to communities. Non-structural flood measures, including forecasting and warning are indispensable to complement structural measures. Nonetheless, predictability of flash flood events is considered limited because of high spatial and temporal variability. In this research, uncertainties in the short torrential rainfall and its corresponding flood in urban river basin are explored. Uncertainty in rainfall prediction is assessed by developing ensemble prediction system. Initial condition of the translation model is perturbed based on advection vector incorrectness. An updating scheme is introduced to provide more reliable rainfall short-term prediction. Parametric uncertainty of the CDRMV3 distributed hydrological model is analyzed by perturbing the model parameters with scalar multiplier. Two sensitive parameters of the rainfall-runoff model are each perturbed five times within their physical bounds. The range of uncertainty generated by ensemble prediction and their potential for obtaining flood risk estimates is demonstrated. Understanding sources of uncertainties of complex dynamic systems and communicating the predictive uncertainties remain challenges in using ensemble operationally. Yet, the proposed system employing a fix number of members allows for a simple system, which is essential in the flash flood warning context. The approach is demonstrated through case studies in Sumiyoshi River Basin Japan, which passes through a highly urbanized area in Kobe City, Japan. Verified with observed data, the combined input-parameter ensemble could serve as a reliable and effective system for operational flood disaster prevention in urban area. The advantages of ensemble prediction over the single deterministic forecast are demonstrated. Uncertainty assessment in rainfall-runoff model parameters gives important information regarding the potential of flooding. The ensemble technique is less sophisticated and easier to be communicated to non-expert users in the operational systems. It could be a useful approach to manage the uncertainty in the flood short-term prediction in urban river basin and elevate the public security from the flash flood threat.

    TSINGHUA UNIV, 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

    This paper describes the ensemble approach to account for the uncertainty in both rainfall and hydrological short-term prediction. The range of probabilistic products generated by ensemble prediction and their potential for obtaining flood risk estimates is demonstrated. An ensemble rainfall prediction is developed by perturbing the initial condition of the radar echo extrapolation model. The ensemble members are subsequently considered as uncertain input of the distributed hydrological model. Uncertainty in rainfall-runoff model parameters is assessed by the generalized likelihood uncertainty estimation (GLUE) method. The methodology is demonstrated through case studies in the Kofu urban river basin, Japan. The results reveal that plausible results can be achieved, thus indicating that this approach could serve as a reliable method for estimating the uncertainty range in short-term prediction of runoff dynamics. When utilized along with the flood damage model, we highlight the value of ensemble prediction for deriving flood risk information through risk mapping. © 2013 IAHS Press.

    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

    In this study, two numerical experiments of convective rainfall observed on 15 August 2001, in central Japan, were conducted using a cloud-resolving, land atmosphere coupled model to investigate the effect of initial soil moisture on short-term weather phenomena. The first experiment, called WET, used the wettest soil condition observed in August 2001 as the initial soil moisture value. The other experiment, called DRY, used the driest condition in August 2001 as its initial soil moisture value. A comparison of the results for WET and DRY showed that a drier soil-moisture condition led to higher rainfall over both the mountainous region in central Japan and Nobi Plain. Greater differences in rainfall amounts were found over the plain than over the mountainous region. The difference in near-surface convergence and atmospheric stability caused by local circulation was found to play an important role in transmitting the variation in soil moisture to rainfall.

    INT ASSOC HYDROLOGICAL SCIENCES, 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

    In this study, two numerical experiments of convective rainfall observed on 15 August 2001, in central Japan, were conducted using a cloud-resolving, land-atmosphere coupled model to investigate the effect of initial soil moisture on short-term weather phenomena. The first experiment, called WET, used the wettest soil condition observed in August 2001 as the initial soil moisture value. The other experiment, called DRY, used the driest condition in August 2001 as its initial soil moisture value. A comparison of the results for WET and DRY showed that a drier soil-moisture condition led to higher rainfall over both the mountainous region in central Japan and Nobi Plain. Greater differences in rainfall amounts were found over the plain than over the mountainous region. The difference in near-surface convergence and atmospheric stability caused by local circulation was found to play an important role in transmitting the variation in soil moisture to rainfall. Copyright © 2013 IAHS Press.

    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

    One week ensemble weather forecast issued by Japan Meteorological Agency has been introduced into integrated operation of multi-reservoirs system in order to develop a short term flood control model which reduces the water level of the river. Stochastic dynamic programming has been applied for decision making of releasing water from three reservoirs with the One week ensemble weather forecast. A flood happened in Nabari river basin where river authorities conducted their integrated operation of multi-reservoirs without the ensemble forecast was selected as a case study. Water level calculated by the proposed method has been compared with the result of actual decision made by authority, one calculated under ideal condition of hundred percent weather forecasting and one following a procedure of dam operation rule. Then the proposed method obtained the best optimization.

    TSINGHUA UNIV, 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

    This study investigates an interdisciplinary scenario analysis to assess the potential impacts of climate, land use/cover and population changes on future water availability and demand in the Srepok River basin, a trans-boundary basin. Based on the output from a high-resolution Regional Climate Model (ECHAM 4, Scenarios A2 and B2) developed by the Southeast Asia-System for Analysis, Research and Training (SEA-START) Regional Center, future rainfall was downscaled to the study area and bias correction was carried out to generate the daily rainfall series. Land use/cover change was quantified using a GIS-based logistic regression approach and future population was projected from the historical data. These changes, individually or in combination, were then input into the calibrated hydrological model (HEC-HMS) to project future hydrological variables. The results reveal that surface runoff will be increased with increased future rainfall. Land use/cover change is found to have the largest impact on increased water demand, and thus reduced future water availability. The combined scenario shows an increasing level of water stress at both the basin and sub-basin levels, especially in the dry season. © 2012 Springer Science+Business Media B.V.

    Mar. 2012, Water Resources Management, 26 (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

  • DEVELOPMENT OF WEB-BASED, MAP-ORIENTED WORKSPACE PLATFORM FOR STORING AND SHARING HYDROLOGICAL DATA

    Temur KHUJANAZAROV, Yutaka Ichikawa, Jun Magome, Satoru Oishi

    Mar. 2012, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), Vol. 68, No.4, pp.I_151-I_156

    [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

    In the present study, a stationary convective system persisting for approximately six hours over the Asagiri Highland adjoining Suruga Bay, Japan on 28 July 2010 was investigated primarily using X-band multi-parameter radar observation data. Over the Asagiri Highland with the moist southerly wind from Suruga Bay associated with thermally induced local circulations, 54 precipitating cells were generated continuously. The anvil extending southeastward from the existing precipitating cells did not prevent new precipitating cells from continuous appearance. Thus, the convective system was maintained for approximately six hours. Then, small advection of the transient cells contributed to the formation of a convective system with a horizontal scale of approximately 20 km. Among them, the precipitating cells that appeared over the gradual slope toward Mt. Kenashi, which is located in the western part of Asagiri Highland, moved toward the northwest part of Mt. Fuji. The precipitating cells were supplied with sufficient moisture because the direction was normal to that of moist southerly wind blowing from Suruga Bay. In one of those precipitating cells, two cores were identified. One was associated with a shallow convection below the melting level, and the other with a deep convection. They rained on almost the same position in the precipitating cell. The precipitating cell with such cores brought a localized heavy rainfall by efficiently converting the moisture transported from Suruga Bay into rain. © 2012, Meteorological Society of Japan.

    MSJ, 2012, Journal of the Meteorological Society of Japan, 90 (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

    A new videosonde receiving system consisting of two receiving antennas for a set of videosonde and GPS radiosonde has been developed. The antenna for the videosondes is controlled by a GPS slave method, in which the antenna elevation and azimuth are processed every second using GPS location data obtained from a GPS radiosonde attached to the videosonde. The results of the first experimental flight conducted in Okinawa as part of a synchronized observation campaign of a C-band polarimetric radar and videosondes reveal successful reception of clear images of precipitation particles in clouds. © 2012, the Meteorological Society of Japan.

    2012, Scientific Online Letters on the Atmosphere, 8 (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

    Water vapor is one of the most important meteorological variables for weather forecasting. Continuous GNSS estimation of wet tropospheric delay is one of the key techniques for detecting rapid changes of water vapor. Water vapor comes from the ocean in Japan. Therefore, observing the water vapor by GNSS on the sea, especially coastal area is required. Moreover, After Great Eastern Japan Earthquake and Tsunami (GEJET) that happened on March 11, 2011, Japanese government has a plan to deploy many GNSS wave buoys. For effective usage of them as multi-purpose monitoring system of environment of the ocean, the study for observing water vapor over the Osaka bay was conducted and it have gotten a good result by comparison with ground fixed observation. However, it is also true that GNSS observation on the ocean still cost a lot. In order to give higher spatial resolution of water vapor, an advanced method for virtually increasing the measurement point of zenith atmospheric delay is proposed by using slant delays from surrounding points that actually observe.

    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

  • 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

    Integrating the high-resolution estimation of rainfall input from X-band polarimetric Doppler weather radar to the distributed hydrological model offers an improved storm event simulation in urban river basin. Uncertainties are inherent in radar-rainfall observation, and they may propagate into final peak flood estimates. This study investigated the influence of systematic and random error in radar-rainfall input on the performance of the distributed hydrological model. The analysis reveals that the model performance is less affected by systematic error of R(Z(KDP)) estimator. The Normalized Peak Error introduced by the feature of R(Z(H)) and R(KDP) is in the range of - 12.3% to 115.7%, and 5.8% to 66.1% respectively. Perturbed radar-rainfall data with random error intensity exceeding 0.3 is detrimental to the model performances. Analysis of sensitivity has shown that a higher sensitivity of hydrological model performance with respect to the overestimation than to the underestimation of rainfall input.

    WORLD ACAD UNION-WORLD ACAD PRESS, 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

    This paper introduces a development of integrated system for flood inundation mapping in urban river basin by integrating radar observation and inundation model. An accurate high-resolution estimation of rainfall from X-band polarimetric radar was supplied to distributed hydrological model to simulate flood hydrograph due to severe rainfall. Flood stage hydrograph was obtained from 1-D flood routing model. An inundation map was produced by 2-D inundation model for highly urbanized area which considers the spatially distributed rainfall input from radar. An absorbing boundary condition is applied to the inundation model in conjunction with the explicit MacCormack and artificial viscosity scheme. The model was applied to simulate and to evaluate the past storm events in Kofu city, Japan. The validated hydrological model can reasonably simulate flood hydrograph using radar-rainfall estimates. Compared to observed inundation, the model was satisfied to provide a flood hazard map in dense urban area. The system would be useful for local government effectively plan the appropriate countermeasures.

    WORLD ACAD UNION-WORLD ACAD PRESS, 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

    The impact of climate change on local discharge variability is investigated in the Kone River basin located in Central Vietnam. In this study, historical and predicted river discharge trends are discussed. The predicted discharge is simulated using the BTOPMC model based on the A1B scenario as a scientific basis for socioeconomic development and integrated water resource management in the Kone River basin, during the period 2011-2034. During the period 1979-2007, annual discharge in the Kone River basin trended upwards slightly. However, both maximum and minimum discharges declined. The results of the predicted discharge under the A1B scenario suggest that river flow will increase slightly in the Kone River basin in the future. Both annual and flood season discharges will tend to increase during the period 2011-2034. In contrast, discharge during the low flow season will tend to decrease over the same period. For the period 2011-2034, the discharge volume in the Kone River will increase by 3%, in comparison with the period 1980-1999. Water volume will decrease by about 18.6% during the flood season and increase by approximately 90.0% during the low flow season relative to the period 1980-1999. © IWA Publishing 2011.

    2010, Journal of Water and Climate Change, 1 (4), 269 - 279, English

    [Refereed]

    Scientific journal

  • Tran van Ty, Kengo Sunada, Yutaka Ichikawa, Satoru Oishi

    In order to evaluate clearly the state of water resources in the Srepok River basin - a typical rural area in South-East Asia, a Modified Water Poverty Index (MWPI) was developed. Indicators of five components of MWPI were evaluated using the benchmark approach. The cross-correlation among indicators of each component as well as among components were checked; and the high-correlated indicators were eliminated. The calculated MWPI and its components were then mapped and analysed to three different scales (basin, sub-basin and district). From the overall MWPI score, a general conclusion was drawn on the water poverty situation in the basin. The results reveal the variation of water poverty across the basin with the overall MWPI of 64.8, indicating that the basin is in a 'medium-low' water-poor situation. 'Access' and 'Capacity' components are observed to be the main causes of the water problem in the basin. There is a high disparity among the five components of MWPI when spatial and temporal variation of variables is taken into account. It is recommended that the state of water resources should be assessed based on the components rather than the composite index. The differences that scales make indicate the importance of selecting an appropriate scale for water resources assessment. By using the benchmark approach, the pertinence of MWPI results are improved and the potential for wider applicability can be extended. By examining the indicators in the five components, a policy for water development and management is proposed and specific interventions recommended. This result can provide useful information for decision-makers in prioritizing investments in the water sector. © 2010 International Association for Hydro-Environment Engineering and Research.

    2010, International Journal of River Basin Management, 8 (3-4), 305 - 317, English

    [Refereed]

    Scientific journal

  • Tran Van Ty, Kuka, Singh Babel, Kengo Sunada, Satoru Oishi, Akiyuki Kawasaki

    Jul. 2009, Hydrological Research Letters, 3, 27 - 31

    [Refereed]

    Scientific journal

  • Nguyen T.Hai Yen, Kengo Sunada, Satoru Oishi, Kou Ikejima, Tomaya Iwata

    Tonle Sap Great Lake, in the lower Mekong River basin, contributes 60% of Cambodia's inland fisheries catch. There are four types of fisheries, including the middle-scale fishery. The major species comprising the middle-scale fishery are Henicorhynchus spp. (16%), a small-bodied fish caught mainly with small-mesh nets, and Cyclocheilichthys enoplos (13%), and Channa micropeltes (7%) which are caught with a variety of gear. Here we apply the Schaefer surplus production model to the middle-scale fisheries using monitoring data collected between 1995 and 1999. Model simulations determined that the maximum sustainable yield (FMSY) for Henicorhynchus spp., was obtained with the use of 47,206 gillnets (mesh size < 50 mm) and 4269 and 1605 fishing boats for C. enoplos and C. microplestes, respectively. Over 1995-1999, there was a strong trend of increase in fishing effort and decrease of catch-per-unit-effort in the waters of Pursat, Siem Riep and Kampong Chnnang provinces. These provinces have large population centres located close to the fishing grounds; fishing in these areas should be more strictly regulated. © 2009.

    Jun. 2009, Journal of Great Lakes Research, 35 (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]

  • 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

  • Hai Yen T. Nguyen, Ole Pedersen, Kou Ikejíma, Kongo Sunada, Satoru Oishi

    The coral reef indices of biological integrity was constituted based on the reef check monitoring data. Seventy six minimally disturbed sites and 72 maximallv disturbed sites in shallow water and 39 minimally disturbed sites and 37 maximally disturbed sites in deep water were classified based on the high-end and low-end percentages and ratios of hard coral, dead coral and fieshy algae. A total of 52 candidate metrics was identified and compiled, Eight and four metrics were finally selected to constitute the shallow and deep water coral reef indices respectively. The rating curve was applied for each metric to identify two lower a and upper b threshold values. A set of scores 1.3 and 5 was used to score and narrate individual metric values. Each metric value at a site presented a poor. moderated or good condition of reefs. The index was calculated by averaging all selected metric scores. The overall site classification efficiencies were of 65.97 and 66,13% for shallow and deep waters respectively. Importantly, the strong negative correlation between indices and dynamite fishing -0.286 (p<0.01) and number of yacht within 1 km -0.185 (p<0.05) in shallow water and with poison fishing -0.279(p<0.05) and coral damaged by other factors -0.283 (p<0.05) in deep water indicated that coral reef indices were sensitive responses to stressors and can be capable to use as the coral reef biological monitoring tool. © 2009 Academic Journals Inc.

    2009, Journal of Fisheries and Aquatic Science, 4 (2), 90 - 102

    [Refereed]

    Scientific journal

  • Sokhem Pech, Sunada Kengo, Satoru Oishi, Naoki Miyazawa, Daisuke Tanaka

    By using a simple ecosystem model, the study grasps the relationship between the change in inundated areas (water level and flood extends) and the level of fish production in the Tonle Sap Basin (TSB). The model produces the fish production trends that can reflect the changes in key parameters such as flood extent and relative fish area density. The results show the continued dominance of the opportunist/white migratory species in the TSB’s fish composition. It reconfirms the hydrological and biological linkages between the TSB and the Mekong River that require a cross-sectoral and cross-boundary integrated planning and development. © 2008 Taylor and Francis Group, LLC.

    Sep. 2008, International Journal of River Basin Management, 6 (3), 277 - 282

    [Refereed]

    Scientific journal

  • Pech Sokhem, Kengo Sunada, Satoru Oishi

    During the last decade, leaders of the Mekong Countries have found it mutually advantageous to open up the Mekong Sub-Region (MR) for development and trade, which promises some degree of political stability and regional security. Within the present political, cultural, and economic dynamics, the Mekong River Basin (MRB) - one of the major international river basins in MR - is a powerful catalyst for regional cooperation that facilitates sustainable development and regional stability; if, that is, the effective management intervention is in place to make sure that the benefits and costs of river basin development are spread equitably and peacefully. Nonetheless, there are numerous stumbling blocks in achieving integrated and balanced MRB management, such as limited success in real basin wide planning, implementation and monitoring and a poor knowledge base for supporting informed decision making and, finally, political impediments. A workable and truly regional cooperative mechanism for integrated management of the MRB is yet to be developed, regardless of the existence of numerous regional institutions and organizations. The present paper proposes new schemes with (re)designing principles and performance determinants for a regional cooperative mechanism. © 2007 International Water Resources Association.

    Dec. 2007, Water International, 32 (4), 503 - 523

    [Refereed]

    Scientific journal

  • Kitamura Y, O. Kozan, K. Sunada, S. Oishi

    Jun. 2007, Journal of Disaster Research, 2 (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

    Apr. 2007, Annuals of Disaster Prevention Research Institute, Kyoto Univ., (50B), 623 - 634, Japanese

    Research institution

  • N. T. H. Yen, K. Sunda, S. Oishi, K. Ikejima

    The Tonle Sap ecosystem of Cambodia is situated in the lower part of the Mekong River basin (MRB), the TS ecosystem water environment is influenced by 181,035 km(2) of its catchments and water inflow from 4000 km in length of the upper Mekong River. The water quality index (WQI) was developed based on seven environmental chemical factors of DO, NO3+NH4, TOTP, TSS, temperature, pH and conductivity at Kampong Luong monitoring station during the period 1995 - 2002. On PCA, among 15 candidate parameters, the six most variation parameters of 'concentration of TSS mg l(-1'), 'temperature C degree', 'conductivity mS m(-1)', 'ratio between N and P', 'average monthly variation of NO3+NH4N', 'average monthly variation of pH', were identified and selected to constitute the WQI. Each parameter was scored as 1, 3 and 5 and narrated, in order, as poor, fair and good conditions. The yearly WQI score was calculated from these six parameter scores in the relative year. The WQI showed that the highest score of 4.3 was in 1996, while the lowest scores were of 1.3 and 1.0 in 2002 and 1998. Importantly, the WQI was significantly (P < 0.05) correlated with the 'dai' fish catch (r(2) = 0.858) and the fish biological group 4 (r-species) (r(2) = 0.75) during the period 1995-2002 indicating that the index was sensitive to reflect the relation between water quality condition and fish production. Then the WQI should be considerably used as the biological monitoring toot for water quality - fish production assessment. The correlations (P < 0.05) between WQI and fish families of Gyrinocheilidae and Cyprinidae indicated these fish families should be considered to be used as the TS ecosystem water quality bioindicators.

    WIT PRESS, 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

    The Tonle Sap ecosystem of Cambodia is situated in the lower part of the Mekong River basin (MRB), the TS ecosystem water environment is influenced by 181,035 km2 of its catchments and water inflow from 4000 km in length of the upper Mekong River. The water quality index (WQI) was developed based on seven environmental chemical factors of DO, NO3+NH4, TOTP, TSS, temperature, pH and conductivity at Kampong Luong monitoring station during the period 1995 - 2002. On PCA, among 15 candidate parameters, the six most variation parameters of 'concentration of TSS mg 1-1, 'temperature C degree', 'conductivity mS m-1, 'ratio between N and P', 'average monthly variation of NO3+NH4N', 'average monthly variation of pH', were identified and selected to constitute the WQI. Each parameter was scored as 1, 3 and 5 and narrated, in order, as poor, fair and good conditions. The yearly WQI score was calculated from these six parameter scores in the relative year. The WQI showed that the highest score of 4.3 was in 1996, while the lowest scores were of 1.3 and 1.0 in 2002 and 1998. Importantly, the WQI was significantly (P<0.05) correlated with the 'dai' fish catch (r2 = 0.858) and the fish biological group 4 (r-species) (r2 = 0.75) during the period 1995-2002 indicating that the index was sensitive to reflect the relation between water quality condition and fish production. Then the WQI should be considerably used as the biological monitoring tool for water quality - fish production assessment. The correlations (P<0.05) between WQI and fish families of Gyrinocheilidae and Cyprinidae indicated these fish families should be considered to be used as the TS ecosystem water quality bioindicators. © 2007 WIT Press.

    2007, WIT Transactions on Ecology and the Environment, 102, 901 - 912

    [Refereed]

    Scientific journal

  • 雨滴粒径分布を考慮した雨滴衝撃エネルギー算出方法の開発と局所的土砂生産量との関係に関する研究

    大石哲, 佐山敬洋, 中川一, 里深好文, 武藤裕則, SISINGGIH D, 砂田憲吾

    01 Feb. 2005, 水工学論文集, 49 (2), 1087 - 1092, Japanese

    [Refereed]

  • Formation of a terrace in the curved channel widened by implementation on the Hinuma river

    K Hirabayashi, K Sunada, S Oishi, N Miyazawa

    Accretion of the point bar at a widened curve on the Hinuma River was observed from 1990 to 1997 by cross sectioning conducted after main floods. The elevation had reached to that of neighboring terrace at the end of surveying. From the investigation, the authors recognized that springing of vegetation on the point bar triggered the accretion. A numerical simulation lent credence to the hypothesis. And the simulation suggested that advection of suspended load was the most important factor for the simulation of local depositions such as the accretion of a point bar.

    TSINGHUA UNIVERSITY PRESS, 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

    Equations of erosion/deposition rate of suspended sediment were used in the 2D numerical mudflow model developed by Miyazawa et al. (2002). The previous mudflow model is improved in the present study by using the equations of erosion/deposition rate applicable to mudflow, which were determined empirically by laboratory tests from Hirano et al. (1997), Egashira et al. (1993) and Winterwerp et al. (1990). The erosion/deposition rates are related with the hindered settling velocity. The revised model was applied to compute the bed elevation variations inside the Mega-Dike system in the lower Pasig-Potrero river basin. It is found that the simulated bed variation is in reasonable agreement with the measurements.

    MILLPRESS SCIENCE PUBLISHERS, 2003, DEBRIS-FLOW HAZARDS MITIGATION: MECHANICS, PREDICTION, AND ASSESSMENT, VOLS 1 AND 2, 659 - 670, English

    [Refereed]

    International conference proceedings

  • OISHI SATORU

    土木学会, 2003, 水工学論文集, 第47巻, pp.691 - 696, Japanese

    Scientific journal

  • OISHI SATORU

    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), 501 - 517, English

    Scientific journal

  • A 2D numerical modeling of mudflow and its applicability to the Mt. Pinatubo area, Philippines

    N Miyazawa, K Sunada, S Oishi, K Hirabayashi

    Owing to the historical eruption of Mt. Pinatubo in the Philippines on June 15, 1991, in the rainy season, the mudflow (lahar) flowed and deposited in the downstream area and brought serious damage to several villages. In order to conduct proper countermeasures against the mudflow hazard, it is necessary to estimate the deposited area of mudflow exactly. In this paper, a two-dimensional numerical model of the mudflow was developed. The resistance law of the turbulent mudflow, which has been proposed by Arai and Takahashi [1], was used in the model. The model was applied to the overland mudflow in the southeast area of Mt. Pinatubo. It was found that the proposed model is useful to be applied to the overland mudflow by giving the proper topography.

    WORLD SCIENTIFIC PUBL CO PTE LTD, 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

    The authors conducted a set of survey on suspended sediment load transportation in the Kataniwa River, during the flood on June 22nd-23rd'97, and analyzed the concentration of suspended sediment. The following relationships are found out through the analysis; 1) the shape of suspended load flux hydrograph is corresponding to the discharge hydrograph, 2) on the other hand, the one of wash load is not corresponding to the discharge hydrograph, but to the hyetograph. These relationships lead to the hypothesis that the suspended load yields at the riverbed and is transported with the flood flow, and that the wash load yields at the surface of the basin and pours into the channel rapidly. To investigate a mechanism of these relationships, a numerical model which evaluates concentration of suspended sediment load on a tributary basin, was newly developed. Two types of the sediment yield model were demonstrated in accordance with gain size. The larger coarser grain size was produced at the riverbed, and the smaller finer size like wash load was produced on the surface of the basin. The results of the simulation of suspended load show fairly good agreement with the observed data.

    WORLD SCIENTIFIC PUBL CO PTE LTD, 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

    土木学会, 2001, 土木学会論文集, (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

    日本気象学会, 2000, Tenki, 47 (1), 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), 307 - 322, Japanese

    Research institution

  • OISHI SATORU

    土木学会, 1997, 水工学論文集, 第41巻 (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), 245 - 262, Japanese

    Research institution

  • 琵琶湖プロジェクト′95における大気境界層観測

    田中賢治, 大石哲, 中北英一, 池淵周一

    Apr. 1996, 京都大学防災研究所年報, 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), 251 - 269, Japanese

    Research institution

MISC

  • 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), 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

  • 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

    This book discusses different aspects of water resources, ranging from hydrology and modeling to management and policy responses. Climate changes and the uncertainty of future hydrological regimes make sustainable water resources management a difficult task, requiring a set of approaches that address climate variability and change. The book focuses on three main themes: hydrological changes, adaptive decision-making for water resources, and institutional analysis and risk management. It discusses the applications and limitations of climate change models and scenarios related to precipitation projection, which predicts to the future availability of water. It also offers interesting examples from around the globe to describe the policy options for dealing with climate change. Addressing emerging issues that need to be resolved and techniques that can be applied for sustainable climate-change-sensitive water resources protection and management, this practical, state-of-the-art reference book is a valuable resource for researchers, students and professionals interested in sustainable water resources management in a changing climate.

    Springer Singapore, 01 Jan. 2016, Sustainable Water Resources Planning and Management Under Climate Change, 1 - 303, English

    Others

  • 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

    Oct. 2014, 日本気象学会2014年度秋期大会, 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

  • 京阪神都市圏における積乱雲の発生・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

    中北英一, 山口弘誠, 坪木和久, 大東忠保, 橋口浩之, 川村誠治, 中川勝広, 岩井宏徳, 鈴木賢士, 大石哲, 相馬一義, 鈴 木善晴, 小川まり子

    Sep. 2014, 水文・水資源学会2014年度総会・研究発表会, Japanese

  • 豪雨の発生・発達をとらえる大規模フィールド同期観測実験と水災害軽減に向けた総合的基礎研究

    中北英一, 鈴木賢士, 大石哲, 坪木和久, 川村誠治, 橋口浩之, 中川勝広, 鈴木善晴, 大東忠保, 相馬一義, 山口弘誠

    25 Sep. 2013, 水文・水資源学会2013年度総会・研究発表会, Japanese

  • OISHI Satoru

    Apr. 2010, 混相流, 第24巻2号pp.154-161, Japanese

    Introduction scientific journal

  • 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

  • 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

  • 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), ROMBUNNO.51B,3, Japanese

  • Experimental Study on the Effect of Water Vapor in Boundary Layer on the Atmospheric Delay of GPS.

    1999, Annuals of Disas. Prev. Res. Inst. Kyoto Univ., 42 (B-2), 141 - 151

  • 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

Books etc

  • 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

Presentations

  • 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

Association Memberships

  • 国際水理学会

  • 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

  • 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

  • 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

Research Projects

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • 大石 哲

    科学研究費補助金/基盤研究(C), 2010 - 2012, Principal investigator

    Competitive research funding

  • 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

  • Meteorology using Radar: Severe Storm Mechanism with considering cloud microphysics by using Radar, rain drop observation, model, numerical simulation.

    Competitive research funding

  • Hydrometeorology: Warning System for Flush Flood, Mud Slide, Inundation by using Radar Rainfall Measurement

    Competitive research funding

  • Disaster Prevention Psychology: Human Activity in Severe Disaster

    Competitive research funding

  • Water Resources for Disaster Prevention: Urban Water Resources System in case of Severe Disaster

    Competitive research funding