Directory of Researchers

KOBAYASHI Kenichiro
Resaarch Center for Urban Safety and Security
Associate Professor
Civil Engineering / Architecutre and planning / Building Engineering
Last Updated :2022/10/04

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

Teaching

Research Activities

Research Interests

  • Inundation model
  • Rainfall-runoff model
  • Fugaku, K computer
  • High performance computing
  • GIS
  • Flood Insurance
  • Urban Flooding

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Hydroengineering

Committee Memberships

  • 水文水資源学会, 国際誌編集委員会
  • 土木学会 水工学委員会, 河川部会 委員
  • 土木学会 水工学委員会, 水文部会 委員
  • 土木学会 水工学委員会 委員
  • 水文水資源学会 編集出版委員会 委員
  • 東大地震研・京大防災研 拠点間連携共同研究委員会
  • 自然災害協議会 2号委員(京都大学防災研究所)
  • 自然災害研究協議会 近畿地区部会 部会長
  • IAHR, Technical Committe on Climate Change Adaptation
  • 水文水資源学会 研究調整員会 委員及び委員長
  • 水工学委員会グローカル気候変動適応研究推進小委員会 幹事長
  • 水工学委員会 河川懇談会委員
  • 水文水資源学会 理事

Awards

  • Sep. 2008 自然災害学会, 自然災害学会 優秀発表者賞, 降雨流出・洪水・内水氾濫モデルによる総合的洪水解析−滋賀県日野川流域と竜王町を対象として

    KOBAYASHI KENICHIRO

    Japan society

  • Jun. 2022 土木学会, 令和3年度 国際活動奨励賞

    小林健一郎

  • Apr. 2017 土木学会水工学委員会, アウトスタンディング・ディスカッション賞

    小林健一郎

  • 2017 Journal of Flood Risk Management(JFRM), Outstanding Paper Award 2017のHighly Commended Paper, A high-resolution large-scale flood hazard and economic risk model for the property loss insurance in Japan

    Kobayashi Kenichiro, Kaoru Takara, Sano Hajime, Tsumori Hiromichi, Sekii Katsuyoshi

  • 2021 神戸大学工学研究科・優秀教育賞(実験及び安全指導)

  • 学生受賞:修士課程公聴会・優秀発表賞(田村篤志) 極端豪雨による妙法寺川・球磨川の出水再現および予測手法の検討

  • 学生受賞:水文水資源学会 研究奨励賞(阪口詩乃) Shino Sakaguchi, Keisuke Nakayama, Kenichiro Kobayashi, Katsuaki Komai:Inundation analysis using coupling storage function model with a distributed hydrological model in Kushiro marsh, Japan, Hydrological Research Letters 14(2), 75–80, 2020, DOI: 10.3178/hrl.14.75, 2020

Published Papers

  • 単純極値変数と超過数の視点から見た降水量の極値の数理特性

    北野利一, 渡部哲史, 小林健一郎

    Sep. 2021, 土木学会論文集B1(水工学), 77 (2), I_1153 - I_1158

    [Refereed]

  • 佐用川流域を対象とした複数の流出モデルを用いた気候変動による流量変化予測

    小林健一郎, 川邉結子, 渡部哲史, 北野利一, 丸山恭介

    Lead, Sep. 2021, 土木学会論文集B1(水工学), 77 (2), I_181 - I_186

    [Refereed]

  • 令和元年東日本台風による荒川中流部洪水再現

    小林健一郎, 田中規夫, 丸山恭介, 田中翔, 渡部哲史, 北野利一

    Lead, Sep. 2021, 土木学会論文集B1(水工学), 77 (2), I_1393 - I_1398

    [Refereed]

  • Kenichiro Kobayashi, Le Duc, Tsutao Oizumi, Kazuo Saito

    Abstract. This paper is a continuation of the authors' previous paper (Part 1) on the feasibility of ensemble flood forecasting for a small dam catchment (Kasahori dam; approx. 70 km2) in Niigata, Japan, using a distributed rainfall–runoff model and rainfall ensemble forecasts. The ensemble forecasts were given by an advanced four-dimensional, variational-ensemble assimilation system using the Japan Meteorological Agency nonhydrostatic model (4D-EnVar-NHM). A noteworthy feature of this system was the use of a very large number of ensemble members (1600), which yielded a significant improvement in the rainfall forecast compared to Part 1. The ensemble flood forecasting using the 1600 rainfalls succeeded in indicating the necessity of emergency flood operation with the occurrence probability and enough lead time (e.g., 12 h) with regard to an extreme event. A new method for dynamical selection of the best ensemble member based on the Bayesian reasoning with different evaluation periods is proposed. As the result, it is recognized that the selection based on Nash–Sutcliffe efficiency (NSE) does not provide an exact discharge forecast with several hours lead time, but it can provide some trend in the near future.

    Copernicus GmbH, 23 Mar. 2020, Natural Hazards and Earth System Sciences, 20 (3), 755 - 770, English

    [Refereed]

    Scientific journal

  • Shino Sakaguchi, Keisuke Nakayama, Kenichiro Kobayashi, Katsuaki Komai

    Japan Society of Hydrology and Water Resources, 2020, Hydrological Research Letters, 14 (2), 75 - 80

    [Refereed]

    Scientific journal

  • EVACUATION ANALYSIS FOR OPTIMAL-LOCATING OF FLOOD DISASTER SHELTERS FOCUSING ON ULSAN METROPOLITAN CITY

    BAE Chang Yeon, 小林健一郎

    2020, 土木学会論文集 B1(水工学)(Web), 76 (2)

  • KENICHIRO KOBAYASHI, RYO KAWASAKI, ICHIRO FUJITA, KEISUKE NAKAYAMA

    The International Association for Hydro-Environment Engineering and Research (IAHR), 01 Sep. 2019, 38th IAHR World Congress - "Water: Connecting the World"

    [Refereed]

    International conference proceedings

  • 兵庫県芦屋高校の大規模避難訓練とマルチエージェント避難モデルによる再現

    小林健一郎, 千郷直斗, 丸山満帆, 木村圭佑, 浜中俊行, Bae Chang Yeon, 孟凡淞

    Aug. 2019

    [Refereed]

  • d4PDFを用いた天候インデックス保険の プライシングに関する検討

    小林健一郎, 木下信孝, 丸谷靖幸, 川邊結子, 中村皓人

    Lead, Aug. 2019, 土木学会論文集B1(水工学), 75 (2), I_1033 - I_1038

    [Refereed]

  • 貯水池底層における貧酸素水塊発生機構の解明

    山元幸之助, NAKAYAMA KEISUKE, 藤井智康, 藤原建紀, 清水武俊, KOBAYASHI KENICHIRO

    Dec. 2018, 土木学会論文集B1(水工学), 74 (5), I - 535-I_540, Japanese

    [Refereed]

    Scientific journal

  • 浅水流方程式・局所慣性方程式の精度検証と最適空間解像度に関する検討

    KOBAYASHI KENICHIRO, NAKAYAMA KEISUKE, 阪口詩乃

    Dec. 2018, 土木学会論文集B1(水工学), 74 (5), I - 1513-I_1518, Japanese

    [Refereed]

    Scientific journal

  • 洪水氾濫シミュレーションにおいて風の影響を考慮する必要性に関する検討

    KOBAYASHI KENICHIRO, NAKAYAMA KEISUKE, 田中翔, 阪口詩乃, 奥勇一郎, 池内幸司

    Dec. 2018, 土木学会論文集B1(水工学), 74 (5), I - 1459-I_1464, Japanese

    [Refereed]

    Scientific journal

  • 河川出水による貯水池の底層水交換モデルの提案

    KEISUKE NAKAYAMA, 藤原建紀, 藤井智康, KOBAYASHI KENICHIRO, 清水武俊, 佐藤啓央, 山元幸之助

    土木学会, Feb. 2018, 土木学会論文集B1(水工学), 74 (4), 355 - 360, Japanese

    [Refereed]

    Scientific journal

  • 貯水池における出水時の成層場鉛直混合に関する検討

    NAKAYAMA KEISUKE, 藤原建紀, 藤井智康, 小林健一郎, 中島祐輔, 佐藤啓央

    土木学会, Mar. 2017, 土木学会論文集B1(水工学), 73 (4), I - 979-I_984, Japanese

    [Refereed]

    Scientific journal

  • Kenichiro KOBAYASHI, Keisuke NAKAYAMA, Shino SAKAGUCHI

    Lead, Japan Society of Civil Engineers, 2017, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 73 (4), I_1405 - I_1410, Japanese

    [Refereed]

    Scientific journal

  • Accuracy of KU-STIV for discharge measurement in Ghana, Africa

    Ichiro FUJITA, Kenichiro KOBAYASHI, Frederick Yaw LOGAH, Frank TEYE OBLIM, Bob ALFA, Saya TATEGUCHI, Kwabena KANKAM-YEBOAH, Gabriel APPIAH Collins, Kissi ASANTE-SASU, Ryo KAWASAKI, Hirohiko ISHIKAWA

    土木学会, Mar. 2017, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 73 (4), I_499 - I_504, English

    [Refereed]

    Scientific journal

  • EVALUATION OF LANDSLIDE DISASTER BY PSEUDO GLOBAL WARMING EXPERIMENT RAINFALL AND SOIL WATER INDEX ON SHINGU RIVER BASIN, WAKAYAMA WITH TYPHOON T1204

    西岡誠悟, KOBAYASHI KENICHIRO, 奥勇一郎, 江種伸之, 田内裕人

    土木学会, 2017, 土木学会論文集B1(水工学), 61 (4), Ⅰ_187 - 192, Japanese

    [Refereed]

    Scientific journal

  • Kenichiro Kobayashi, Shigenori Otsuka, Apip, Kazuo Saito

    This paper presents a study on short-term ensemble flood forecasting specifically for small dam catchments in Japan. Numerical ensemble simulations of rainfall from the Japan Meteorological Agency nonhydrostatic model (JMA-NHM) are used as the input data to a rainfall-runoff model for predicting river discharge into a dam. The ensemble weather simulations use a conventional 10aEuro-km and a high-resolution 2aEuro-km spatial resolutions. A distributed rainfall-runoff model is constructed for the Kasahori dam catchment (approx. 70aEuro-km(2)) and applied with the ensemble rainfalls. The results show that the hourly maximum and cumulative catchment-average rainfalls of the 2aEuro-km resolution JMA-NHM ensemble simulation are more appropriate than the 10aEuro-km resolution rainfalls. All the simulated inflows based on the 2 and 10aEuro-km rainfalls become larger than the flood discharge of 140aEuro-m(3)aEuro-s(-1), a threshold value for flood control. The inflows with the 10aEuro-km resolution ensemble rainfall are all considerably smaller than the observations, while at least one simulated discharge out of 11 ensemble members with the 2aEuro-km resolution rainfalls reproduces the first peak of the inflow at the Kasahori dam with similar amplitude to observations, although there are spatiotemporal lags between simulation and observation. To take positional lags into account of the ensemble discharge simulation, the rainfall distribution in each ensemble member is shifted so that the catchment-averaged cumulative rainfall of the Kasahori dam maximizes. The runoff simulation with the position-shifted rainfalls shows much better results than the original ensemble discharge simulations.

    COPERNICUS GESELLSCHAFT MBH, Aug. 2016, NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, 16 (8), 1821 - 1839, English

    [Refereed]

    Scientific journal

  • ゲリラ豪雨に対する都賀川の流出モデル開発と河川監視カメラを活用した水位流量ハイドロの検証

    Fujita Ichiro, Kobayashi Kenichiro, Okuyama Takaya, Kumano Genki

    土木学会, 2016, 土木学会論文集B1(水工学), 72 (4), I_151 - I_156, Japanese

    [Refereed]

    Scientific journal

  • Kobayashi Kenichiro, Kitamura Dai, Ando Kazuto, Ohi Noriyuki

    This paper reports the implementation of high-performance computing using the K supercomputer in Kobe, Japan, for large-scale/high-resolution flood simulation. Supercomputer K was developed in 2012 by RIKEN and Fujitsu and ranked first in the list of Top 500 supercomputer sites in 2011 during its development stage. A two-dimensional inundation simulation model developed based on a shallow water equation using an existing numerical scheme was parallelized with the K supercomputer. Osaka and other cities along the Yodo River were chosen as application sites and the area discretized by 12824442 (= 3453 × 3714) nodes with a resolution of 10 m. The computational time for the five-hour flood simulation was measured by changing the number of 8-core CPUs of the K supercomputer. As a result, computational time was decreased to 9.3 min by using 128 × 64 = 8192 8-core CPUs. The computational time was 1423.7 min for one 8-core CPU. Thus, the simulation speed increased by a factor of 153.2 with the use of the K supercomputer.

    Japan Society of Hydrology and Water Resources, Nov. 2015, Hydrological Research Letter, 9 (4), 61 - 68, English

    [Refereed]

    Scientific journal

  • NOTOYA Taku, KOBAYASHI Kenichiro, OKU Yuichiro, KIMURA Keisuke

    Recently heavy rains occur frequently and researchers consider a climate change may be one of the causes. Thus, this study estimates the influence of the sea surface temperature changes on rainfall intensity due to a Typhoon. First the Typhoon No.18, 2013 which caused heavy damage on Kyoto and Shiga prefectures due to the heavy rainfall is reproduced (control run). Then its SST global warming experiment is carried out using latest meso-scale meteorological model WRF. As the result of the SST global warming experiment, the catchment average rainfall of the Yodogawa river above Hirakata becomes 1.5 times larger than that of the control run. This result indicates a possibility that further heavier rainfall may occur in the future due to a climate change.

    土木学会, Feb. 2015, 土木学会論文集B1(水工学), 71 (4), I_397 - I_402, Japanese

    [Refereed]

    Scientific journal

  • KIMURA Keisuke, KOBAYASHI Kenichiro

    Nishinomiya city has conducted a large-scale evacuation exercise for the citizens against the assumed Nankai-Trough Tsunami disaster on January 27th 2013. In the occasion, we conducted the observation of the evacuee behaviors by GPS loggers. Then, a numerical evacuation model based on a multi-agent theory is constructed. The complex road network is incorporated in the modelling with the modification of some roads based on the on-site survey. The retardation of the evacuation by the evacuee density is also considered. The simulation is compared with the GPS log. The results indicate that the situation of evacuation training is reproduced by the model on some level. Finally, the evacuation of large number of people (10000) is tested with the numerical model.

    土木学会, Feb. 2015, 土木学会論文集B1(水工学), 71 (4), I_1375 - I_1380, Japanese

    [Refereed]

    Scientific journal

  • Impact of Climate Change on River Flows in the Black Volta River

    SAWAI Nobuhiko, KOBAYASHI Kenichiro, Apip, TAKARA Kaoru, ISHIKAWA Hirohiko, YOKOMATSU Muneta, SAMADDAR Subhajyoti, JUATI Ayilari-Naa, KRANJAC-BERISAVLJEVIC Gordana

    Jun. 2014, Journal of Disaster Research, 9 (4), 432 - 442, English

    [Refereed]

    Scientific journal

  • A high-resolution large-scale flood hazard and economic risk model for the property loss insurance in Japan

    KOBAYASHI KENICHIRO, TAKARA KAORU, SANO HAJIME, TSUMORI HIROMICHI, SEKII KATSUYOSHI

    Jun. 2014, Journal of Flood Risk Management, DOI: 10.1111/jfr3.12117, English

    [Refereed]

    Scientific journal

  • KOBAYASHI Kenichiro, OKU Yuichiro, NAKAKITA Eiichi, NAKANO Masuo, TAKARA Kaoru

    This paper deals with a methodology to estimate the variations of flood hazard and risk due to a climate change. A pseudo global warming (pgw) experiment result of the Isewan Typhoon in 1959 is used as the rainfall input with a climate change effect to a distributed rainfall-runoff/flood inundation (DRR/FI) model. The simulated rainfalls of the control run (ctl) for the reproduction of the Isewan Typhoon as well as pgw experiment by JMA-NHM exhibit that, though the 48-hrs rainfall of ctl underestimates the observation, the maximum hourly rainfall of pgw becomes much higher than the observation. As the result, the simulated water level/discharge and inundation depth with pgw rainfall becomes all worse than those of the Isewan Typhoon.

    Japan Society of Civil Engineers, Feb. 2014, PROCEEDINGS OF THE JAPANESE CONFERENCE ON HYDRAULICS, 70 (4), I_391 - I_396, Japanese

    [Refereed]

    Scientific journal

  • KOBAYASHI Kenichiro, OKU Yuichiro, NAKAKITA Eiichi, NAKANO Masuo, TAKARA KAORU

    This paper deals with a methodology to estimate the variations of flood hazard and risk due to a climate change. A pseudo global warming (pgw) experiment result of the Isewan Typhoon in 1959 is used as the rainfall input with a climate change effect to a distributed rainfall-runoff/flood inundation (DRR/FI) model. The simulated rainfalls of the control run (ctl) for the reproduction of the Isewan Typhoon as well as pgw experiment by JMA-NHM exhibit that, though the 48-hrs rainfall of ctl underestimates the observation, the maximum hourly rainfall of pgw becomes much higher than the observation. As the result, the simulated water level/discharge and inundation depth with pgw rainfall becomes all worse than those of the Isewan Typhoon.

    土木学会, Feb. 2014, 土木学会論文集B1(水工学), 70 (4), I_391 - I_396, Japanese

    [Refereed]

    Scientific journal

  • TSUBAKI Ryota, KOBAYASHI Kenichiro, NAITO Masahiko, TANIGUCHI Sususmu

    土木学会, 2014, 河川技術論文集, 19, 1 - 6, Japanese

    [Refereed]

    Scientific journal

  • Ensemble forecasting of rainfall and flood in a small river basin

    KOBAYASHI KENICHIRO

    Jap, Feb. 2013, The Journal of Japan Society of Civil Engineers, Ser. B1, 69 (4), 1597 - 1602, Japanese

    [Refereed]

    Scientific journal

  • メソアンサンブルによる予報

    SAITO KAZUO, ORIGUCHI SEIJI, Le Duc, KOBAYASHI KENICHIRO

    Japan Meteorological Agency, Feb. 2013, Technical Report of the Japan Meteorological Agency, (134), 170 - 184, Japanese

    [Refereed]

    Research institution

  • 台風12号のメソアンサンブル予報実験

    Origuchi Seiji, Saito Kazuo, KOBAYASHI KENICHIRO

    気象庁, 2013, 気象庁技術報告, (134), 184 - 194, Japanese

    [Refereed]

    Research institution

  • Evaluation of water retention capacity and flood control function of the forest catchment

    Nobuhiko Sawai, Kaoru Takara, Kenichiro Kobayashi

    Federation of German Scientists (VDW), 2013, Journal on Food, Agriculture and Society, 1 (1), 13 - 22, English

    [Refereed]

    Scientific journal

  • An Ensemble Flood Simulation for The Dam Preliminary Release Operation In Japan Using JMA-NHM Rainfall

    Kenichiro Kobayashi, Shigenori Otsuka, Kazuo Saito

    The paper deals with a study on a short-date ensemble flood forecasting specifically for usual small dam catchments in Japan. The numerical ensemble rainfalls simulated by the Japan Meteorological Agency - Nonhydrostatic Model (JMA-NHM) are used as the inputs to a rainfall-runoff model for predicting river discharge into a dam. The spatial resolution of the weather ensemble simulations by JMA-NHM is 2 km, thus it has a potential to be used for even small-scale Japanese dam catchments (less than 100km(2) area). The Kasahori dam catchment which size is approximately 70 km(2) is selected as the application site of the ensemble flood simulations since the dam catchment experienced a historically rare rainfall/flood event on July 2011. Firstly, the rainfall over the Kasahori dam catchment during the flood period is analyzed with the ground rainfall, JMA Radar-Composite and JMA Radar-AMeDAS analysis data. Then, a distributed rainfall-runoff model is applied to the Kasahori dam catchment. The runoff-model parameter is calibrated with the Radar-Composite rainfall. Afterwards, the ensemble rainfalls by the JMA-NHM are given to the runoff model. The ensemble inflow discharges to the Kasahori dam are compared with the observed inflow. As a result, a simulated discharge of 11 ensemble members succeeds in reproducing the Kasahori dam 1st peak inflow at the same level magnitude with the observation, though the simulated peak is 2 hours ahead of the observed peak. All the 11 ensemble discharges predict the values more than the flood discharge 140 m(3)/s, a threshold value to decide the preliminary release from the dam. The result indicates a good potential of the ensemble flood forecasting even for small dam catchments.

    TSINGHUA UNIV, 2013, PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV, CDROM, 10428 - 10437, English

    International conference proceedings

  • Development of a Distributed Rainfall-Runoff/Flood Inundation Simulation and Economic Risk Assessment Model, Journal of Flood Risk Management

    KOBAYASHI KENICHIRO, TAKARA KAORU

    Blackwell Publishing Ltd and The Chartered Institution of Water and Environmental Management (CIWEM), Aug. 2012, Journal of Flood Risk Management, 6 (2), 85 - 98, English

    [Refereed]

    Scientific journal

  • 雨域の移動が流域の降雨流出・洪水氾濫過程に及ぼす影響 The Influence of the Moving Rainstorms on the Rainfall-Runoff and Flood Inundation Processes in a Catchment

    KOBAYASHI Kenichiro, TAKARA Kaoru

    2009, 水工学論文集,土木学会 Vol.53, pp.841-846, Japanese

    [Refereed]

  • Notoya Taku, Kobayashi Kenichiro, Oku Yuichiro, Kimura Keisuke

    Recently heavy rains occur frequently and researchers consider a climate change may be one of the causes. Thus, this study estimates the influence of the change of sea surface temperature on rainfall due to a Typhoon. First the Typhoon No.18, 2013 which caused heavy damage on Kyoto and Shiga prefectures due to the heavy rainfall is reproduced (control run). Then its SST global warming experiment is carried out using latest meso-scale meteorological Model WRF. As the result of the SST global warming experiment, the catchment average rainfall of Yodogawa river above Hirakata becomes 1.5 times larger than that of control run. This result indicates the possibility that further heavier rainfall may occur in the future due to a climate change.

    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100131 - 100131, Japanese

  • Chang Yeon Bae, Kenichiro Kobayashi

    There is an increasing demand for establishing pre-emptive measures for disaster management. However, there is a lack of support systems available for vulnerable individuals living in disaster-prone regions in Korea. This study constructs a multi-agent simulation model to analyze the evacuation time for Dongnae district and Yeonje district in Busan, Korea. In disaster-prone regions, vulnerable people experience difficulties, such as, obtaining updated information about the disaster situation, and this reduces their evacuation speed. Additionally, there is a possibility that the evacuation speed, while evacuating vulnerable people, may decrease due to environmental and geographic factors, including the slope and elevation of the areas. Therefore, this section of the society requires special attention and policies that are different from those made for people who may not face such calamities and are physically abled. An analysis based on factors such as road slopes and delays in evacuation due to flooding, was conducted to formulate realistic evacuation plans for people who are vulnerable. The location of shelters in the case of flooding in Dongnae and Yeonje district, have been better identified. Furthermore, it was confirmed that the evacuation time could be reduced if wide-area evacuation is implemented. This study provides a base for developing suitable shelters and evacuation plans for disaster-prone regions.

    Lead, Fuji Technology Press Ltd., 01 Aug. 2021, Journal of Disaster Research, 16 (5), 866 - 873

    [Refereed]

    Scientific journal

  • Kenichiro Kobayashi, Yasunori Kono, Takao Kimura, Haruya Tanakamaru

    Lead, Japan Society of Hydrology and Water Resources, 2021, Hydrological Research Letters, 15 (3), 64 - 70, English

    [Refereed]

    Scientific journal

  • Shino SAKAGUCHI, Keisuke NAKAYAMA, Kenichiro KOBAYASHI

    Japan Society of Civil Engineers, 2018, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 74 (4), I_1423 - I_1428

    [Refereed]

    Scientific journal

  • Kenichiro KOBAYASHI, Kaoru TAKARA, Hajime SANO, Hiromichi TSUMORI, Katsuyoshi SEKII

    Lead, Japan Society of Civil Engineers, 2012, Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering), 68 (4), I_1069 - I_1074

    [Refereed]

    Scientific journal

  • Kenichiro Kobayashi, Kaoru Takara, Mitsugu Funada, Yukiko Takeuchi

    This paper proposes a flood economic risk assessment framework using vector GIS data, expressing individual house and paddyfield, prepared by a municipal Japanese government. Flood inundation is first simulated with a structured grid, then the simulated flood inundation depth, expressed in grid cells, is assigned to vector data house and paddyfield polygons as attributes. Flood-damage ratios of houses and paddyfields are then calculated using relationships of the flood depth, duration, and damage ratio opened by the Japanese Ministry of Land, Infrastructure, Transport, and Tourisms (MLIT). Economic loss involving building and paddyfield damages due to flooding is then calculated by multiplying the damage ratio, evaluation price per area, and the asset area. The advantage of using such vector data is that it yields the area of each house and paddyfield precisely, which also realizes, on average, the precise economic loss estimation. As the results, the spatial distribution of economic loss on an individual house/paddyfield scale is also identified. Since vector data shows area characteristics, the framework proposed here is useful in communitybased flood management. A workshop presenting the framework showed that the system potentially induces workshop participants to consider community-based flood hazard management.

    Lead, Fuji Technology Press Ltd., 01 Dec. 2010, Journal of Disaster Research, 5 (6), 657 - 665

    Scientific journal

  • 全球気候モデル出力を用いた日本域の100年確率日降水量の将来予測

    小林健一郎, 寶 馨, 中北英一

    Lead, 2010, 土木学会水工学論文集, 54, 223 - 228

    [Refereed]

  • 全球気候モデル出力と洪水及び経済被害推定モデルを用いた中小河川の水害リスクの将来変動に関する研究

    2010, 河川技術論文集, 16, 495 - 500

    [Refereed]

  • Kenichiro Kobayashi, Reinhard Hinkelmann, Rainer Helmig

    The main purpose of this paper is to demonstrate the capability of a new simulation–optimization model especially tailored to investigate the optimal management strategy of a closed coal mine in the Ruhr, Germany. This paper deals with the multiphase/multicomponent flow simulation; the optimization model (simulated annealing); the mesh generation function; the coupling of them; and the use of a parallel computer. Firstly, a mesh generation function is included in the total procedure for the modelling of complex system configurations often required when the real-world problem is dealt with. The multiphase/multicomponent flow simulator can simulate not only groundwater flow and a tracer in it but also the multiphase systems (e.g. gas–water, gas–water–NAPL system). Moreover, a parallelization strategy for the optimization procedure is proposed and implemented to overcome the enormous CPU time problem always tagged to real-world simulation–optimizations. This strategy succeeded in enhancing the efficiency of the overall procedure almost linearly by the number of the processors in a parallel computer. This model is then applied to study how to install the passive extraction wells for controlling the migration of methane continuously desorbed from coal seams inside the closed coal mine in the Ruhr, Germany. The general rule proposed as the result of the application is rather simple although it is considered very useful in many practices of coal mining operations. This paper briefly outlines the overall procedure.

    Lead, IWA Publishing, 01 Mar. 2008, Journal of Hydroinformatics, 10 (2), 139 - 152

    [Refereed]

    Scientific journal

  • A Rainfall-Runoff/Flood-Inundation Model for Myohoji River Basin Kobe Japan with Rainwater Sewage Channels

    Kenichiro Kobayashi, Astushi Tamura, Ichiro Fujita, Akinobu Yamamoto, Kazuyoshi Kanayama

    Lead, 2020, Proceedings of the 22nd IAHR-APD Congress (https://iahrapd2020.xsrv.jp/proceedings/pdf/4-3-8.pdf), 1 - 6

  • Finn Amann, Ilhan Özgen, Morgan Abily, Jiaheng Zhao, Dongfang Liang, Kenichiro Kobayashi, Satoru Oishi, Philippe Gourbesville, Reinhard Hinkelmann

    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.

    EDP Sciences, 2018, E3S Web of Conferences, 40, 06018 - 06018

    [Refereed]

    Scientific journal

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

    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.

    EDP Sciences, 2018, E3S Web of Conferences, 40, 06017 - 06017

    [Refereed]

    Scientific journal

  • Kimura Keisuke, Kobayashi Kenichiro

    To prevent the Tsunami disaster caused by big earthquake, we must evacuate to the higher elevation zone. The actual evacuation training is considered most important to realize the purpose. However, the numerical evacuation model is helpful to obtain more insight as it can simulate the training situation for many cases. To repeat the evacuation training many times for many situations is time consuming.  Thus, this study focuses on constructing an evacuation model. Concretely we refer to Nishinomiya-city large scale evacuation training managed by the municipal government.  The numerical evacuation model is constructed based on GPS pedestrian behavior data measured at the training time. The complex road network is incorporated in the modelling with the modification of some roads based on the on-site survey. The random speed of the pedestrian is considered in the modelling. As the result, we succeed in reproducing the situation of evacuation training by the model on some level.

    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2014, Proceeding of Annual Conference, 27, 100090 - 100090, Japanese

  • 標本サイズと水文頻度解析

    寶 馨, 小林健一郎

    2009, 土木学会水工学論文集, 53, 205 - 210

    [Refereed]

  • Kenichiro KOBAYASHI, Kaoru TAKARA, Yasuto TACHIKAWA

    An optimization technique consisting of a Levenberg-Marquardt algorithm is coupled with a distributed rainfall-runoff model. The purpose is to estimate the rainfall-runoff model parameters appropriate for the Yuragawa-river flood by Typhoon No.23 on 19-22 October 2004. The application exhibits that the simulation-optimization model can not only estimate the model parameters well but also quantify sta tistically the relations among the model, the observations and the parameters. This paper describes the usefulness of the relative composite parameter sensitivty (RCPS), the composite observation sensitivity (COS), and the parameter coefficient matrix.

    Lead, Japan Society of Civil Engineers, 2007, PROCEEDINGS OF HYDRAULIC ENGINEERING, 51, 409 - 414

    Scientific journal

  • Kenichiro KOBAYASHI, Reinhard HINKELMANN, Rainer HELMIG, Kaoru TAKARA, Nobuyuki TAMAI

    Lead, Japan Society of Civil Engineers, 2007, Doboku Gakkai Ronbunshuu B, 63 (2), 120 - 133

    [Refereed]

    Scientific journal

  • 小林健一郎, 立川康人, 佐山敬洋, 寶 馨

    Lead, Japan Society of Civil Engineers, 2006, PROCEEDINGS OF HYDRAULIC ENGINEERING, 50, 313 - 318, Japanese

    [Refereed]

    Scientific journal

  • R. HINKELMANN, T. BREITING, K. KOBAYASHI, R. HELMIG, H. SHETA

    WORLD SCIENTIFIC, Jun. 2004, Hydroinformatics, 222 - 229

    [Refereed]

    In book

  • Comparison of Different Model Concepts for Gas-Water Processes in the Subsurface

    Kobayashi,K, Hinkelmann,R, Helmig,R

    Lead, 2003, Proceedings of the XXX IAHR Congress, 661 - 668

    [Refereed]

  • 低水路および外郭堤防法線がともに蛇行し位相差を有する複断面蛇行流路内の流れ

    小林健一郎, 玉井信行, Islam Tarekul

    Lead, 2000, 土木学会水工学論文集, 44, 873 - 878

  • Assessment of Climate Change effect on the extreme flooding of Yodogawa River Basin

    Kenichiro Kobayashi

    Lead, Jun. 2022, Proceedings of the 39th IAHR World Congress, 19-24 June 2022, Granada, Spain, pp.6745-6748, 2022

    [Refereed]

  • 損害保険のための日本全域洪水リスク評価モデルの開発(2)リスク評価モデルの構築と適用例

    長野智絵, 津守博通, 稲村友彦, 佐野肇, 小林健一郎, 佐山敬洋, 寶馨

    2018, 自然災害科学J. JSNDS 37 -2 pp. 191 -203, 2018

    [Refereed]

  • 損害保険のための日本全域洪水リスク評価モデルの開発(1)確率降雨イベントモデルの開発,

    長野智絵, 津守博通, 稲村友彦, 佐野肇, 小林健一郎, 佐山敬洋, 寶馨

    2018, 自然災害科学J. JSNDS 37 -2 pp. 177 -189, 2018

    [Refereed]

  • 中山 恵介, 鬼頭 昭雄, 寶 馨, 竹内 邦良, 仲江川 敏之, 中北 英一, 山敷 庸亮

    水文・水資源学会, 2012, 水文・水資源学会研究発表会要旨集, 25, 60 - 60, Japanese

  • Nakayama Keisuke, Kito Akio, Takara Kaoru, Takeuchi Kuniyoshi, Nakaegawa Toshiyuki, Nakakita Eichi, Yamashiki Yosuke

    極端気象現象の物理機構から影響評価までを専門とする研究者を一同に会し,防災政策に役立つような将来展望を如何に発信するかについて議論を行うことを目的とし活動を行った.主たる活動として,2009年11月5日から6日にかけて開催された,"極端気象現象とその影響評価に関する研究集会~より良い将来予測を目指して~"を挙げることが出来る.研究集会は,21世紀気候変動予測革新プログラム「極端現象予測」,京都大学防災研究所,京都大学防災研究所GCOE-ARS,土木研究所ICHARM,気象庁気象研究所,国土技術政策総合研究所との共催であった.集会では,災害から,水質,生態系システムへの影響,更には水政策や避難行動までも範疇として話題提供された.非常に国民の関心が高い気候変動予測の中でも,災害に結びつく極端現象に関する最新成果と,それを踏まえた議論は,参加者のみならず社会的にも大きな影響を与えることが期待されるものであった.

    THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2010, Proceeding of Annual Conference, 23, 33 - 33, Japanese

MISC

  • A Deliberation of Extreme Flooding in Yodogawa River Catchment using the Outputs of Extreme Typhoon Experiment by Physical Downscaling

    小林 健一郎, 奥 勇一郎, 寶 馨, 石川 裕彦, 竹見 哲也, 中北 英一

    京都大学防災研究所, 2011, 京都大学防災研究所年報, (55), 9 - 14, Japanese

  • Simulating Potential Impacts of Climate Change on Sediment Production and Shallow Landslide in Western Japan

    APIP, TAKARA Kaoru, KOBAYASHI Kenichiro, YAMASHIKI Yosuke, NAKAKITA Eiichi

    京都大学防災研究所, 2011, 京都大学防災研究所年報, (55), 49 - 56, English

  • Development of a Yodogawa River Distributed Rainfall-Runoff/Flood Inundation Simulation Model and its Application to Non-life Insurance

    小林 健一郎, 寶 馨, 佐野 肇, 津守 博通, 関井 勝善

    京都大学防災研究所, 2010, 京都大学防災研究所年報, (54), 129 - 135, Japanese

  • Application of a Levenberg-Marquardt optimization algorithm to the parameter estimation of a distributed rainfall-runoff model

    Kenichiro Kobayashi, Kaoru Takara

    2007, Proceedings of the 6th international Conference on Calibration and Reliability in Groundwater Modelling, ModelCARE, Denmark pp.586-591, English

    [Refereed]

  • 最適化手法による分布型降雨流出モデルのパラメータ推定

    小林健一郎, 寶馨, 立川康人

    2007, 水工学論文集(CD-ROM), 51

  • Economic Loss due to Crop Damages by Flood Inundation : an Integrated Flood Risk Assessment

    小林 健一郎, 寶 馨

    京都大学防災研究所, 2008, 京都大学防災研究所年報, (52), 19 - 27, Japanese

  • CONSIDERATION ON THE DIFFERENCE BETWEEN DYKE-BREAK AND OVERFLOW INUNDATION SIMULATIONS FOR MAKING A FLOOD HAZARD MAP

    KOBAYASHI Kenichiro, TAKARA Kaoru

    19 May 2008, 計算工学講演会論文集, 13 (2), 917 - 918, Japanese

  • Development of an Integrated Rainfall-Runoff/Flood Inundation Simulation Model and the Economic Damage Estimation Framework due to the Flooding

    小林 健一郎, 寶 馨

    京都大学防災研究所, 2009, 京都大学防災研究所年報, (53), 7 - 14, Japanese

  • Estimation of Possible Extreme Flood of Yodo River Basin using the output of Pseudo-Global Warming Simulation by Regional Weather Prediction Model

    石川 裕彦, 小林 健一郎, 奥 勇一郎

    日本河川協会, Oct. 2013, 河川, 69 (10), 45 - 48, Japanese

  • Statistical Analysis of Present and Future River Water Temperature in Cold Regions Using Downscaled GCMs Data

    HE Bin, TAKARA Kaoru, YAMASHIKI Yosuke, KOBAYASHI Kenichiro, LUO Pingping

    京都大学防災研究所, 2010, 京都大学防災研究所年報, (54), 103 - 111, English

  • Paleo-hydrology and Paleo-flow Reconstruction in the Yodo River Basin

    LUO Pingping, HE Bin, TAKARA Kaoru, APIP, NOVER Daniel, KOBAYASHI Kenichiro, YAMASHIKI Yosuke

    京都大学防災研究所, 2010, 京都大学防災研究所年報, (54), 119 - 128, English

  • Analysis of the Yuragawa River Flood by Typhoon No. 23 in October 2004 Using a Distributed Rainfall-Runoff Model

    KOBAYASHI Kenichiro, TAKARA Kaoru, TACHIKAWA Yasuto

    京都大学防災研究所, 2005, 京都大学防災研究所年報, (49), 155 - 162, English

Presentations

  • 極端台風による兵庫県都賀川の流出・浸水予測 極端台風による兵庫県都賀川の流出・浸水予測

    KOBAYASHI Kenichiro, OKU Yuichiro, KAWASAKI Ryo, FUJITA Ichiro

    水文水資源学会2016年度研究発表会, Sep. 2016, Japanese, 水文水資源学会, 福島市, Domestic conference

    Oral presentation

  • マルチ温暖化シナリオに基づいた平成25年台風18号の擬似温暖化実験

    能登谷拓, KOBAYASHI KENICHIRO, 奥勇一郎, 木村圭佑

    平成28年度土木学会全国大会 第71回年次学術講演会, 2016, Japanese, Domestic conference

    Oral presentation

  • 分布型降雨流出・氾濫モデルを用いた神戸市京橋ポンプ場流域における浸水シミュレーション

    Nishioka Seigo, Kobayashi Kenichiro, Fujita Ichiro, Kumano Genki

    平成27年度土木学会全国大会第70回年次学術講演会, Sep. 2015, Japanese, 土木学会, 岡山大学, Domestic conference

    Oral presentation

  • 分布型降雨流出・氾濫モデルによるメコン川流域大規模洪水の再現

    Inoue Shotoku, Kobayashi Kenichiro, Kotera Akihiko, Nagano Takanori

    平成27年度土木学会全国大会第70回年次学術講演会, Sep. 2015, Japanese, 土木学会, 岡山大学, Domestic conference

    Oral presentation

  • メソ気象モデルを用いたT1318 による大雨の再現と海面水温温暖化数値実験

    NOTOYA Taku, KOBAYASHI Kenichiro, OKU Yuichiro, KIMURA Keisuke

    土木学会関西支部, May 2014, Japanese, 大阪産業大学, Domestic conference

    Oral presentation

  • 流出・氾濫モデルと避難モデルの統合による大阪市の広域避難に関する一考察

    KOBAYASHI KENICHIRO

    水文水資源学会, Sep. 2013, Japanese, 神戸大学, Domestic conference

    Poster presentation

  • Ensemble flood forecasting using spatially high resolution numerical rainfalls

    KOBAYASHI KENICHIRO

    Conference on Computational Engineering and Science, Jun. 2013, Japanese, 東京大学生産技術研究所, Domestic conference

    Oral presentation

  • Development of a Yodogawa River Distribute Rainfall-Runoff/Flood inundation model for flood risk management

    KOBAYASHI KENICHIRO

    2nd International Conference on Water Resources, Nov. 2012, English, Bayview Hotel, Langkawi, Kedah, Malyasia, International conference

    Oral presentation

  • NUMERICAL SIMULATION OF NIIGATA-FUKUSHIMA SEVERE RAINSTORM DISASTER IN JULY 2011

    KOBAYASHI KENICHIRO

    Conference on Computational Engineering and Science, Jun. 2012, Japanese, Domestic conference

    Oral presentation

Association Memberships

  • International Water Resources Association

  • International Association for Hydro-Environment Engineering and Research

  • 地理情報システム学会

  • 日本自然災害学会

  • 日本計算工学会

  • 水文水資源学会

  • Japan Society of Civil Engineers

Research Projects

  • 大石 哲

    科学研究費補助金/基盤研究(B), Apr. 2016 - Mar. 2019

    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

    Competitive research funding

  • 小林 健一郎

    科学研究費補助金/若手研究(B), Apr. 2012 - Mar. 2014, Principal investigator

    Competitive research funding

  • Research for optimal evacuation method based on probabilistic flood forecasting with enough lead time

    小林 健一郎

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2019 - Mar. 2022, Principal investigator

    超多数アンサンブル洪水予測について,令和2年7月九州豪雨における球磨川洪水事例を対象に実施した.気象研究者による同豪雨の1000アンサンブル実験を入力として,貯留関数法+カルマンフィルターによる,球磨川市房ダム,川辺川ダム(仮想)の流出計算,その後,人吉市を含む球磨川市街地の洪水流出・浸水計算を実施した.結果として,アンサンブル平均が現地の状況を一定程度再現できることがわかった.また,半日程度のリードタイムを持って,避難勧告を発令できる可能性も示した.他方,平成27年9月関東・東北豪雨についての100アンサンブル洪水予測については,降雨予測が必ずしも線状降水帯を十分に再現できていないことが見て取れ,洪水予測精度についても十分ではなく,過小予測傾向があった. 洪水氾濫に風が与える影響については,荒川流域を対象に実際の風速・風向を入力とした流出・浸水計算を実施した.これにより,風が一定方向に吹き続ける場合は,浸水過程(速度・範囲)に与える影響が強いものの,風向が変わる場合は,影響が全体的に平均化されることがわかった. 避難については,昨年度まで開発してきた一次元道路ネットワーク上で避難所に向かって最短距離を選択して歩行するという行動モデルに加えて,三宮地下街などで2次元的に人々が混雑度などを指標に避難をするモデルを開発した.三宮地下街では歩行行動の観察を実施し,行動者の初期位置の不均一性が避難時間に与える影響についても分析した. 研究成果については,水工学論文集,国際ジャーナルなどに投稿予定である

  • TANAKA Shigenobu, NIINO Hiroshi

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Special Purposes, Grant-in-Aid for Special Purposes, Kyoto University, Oct. 2015 - Mar. 2016, Coinvestigator

    Cumulonimbus clusters as many as 3150 were generated, and rainfall in longer durations exceeded the historical records at many points in the upper reaches of the Kinu River. The embankment of Kinu River breached, and the maximum inundation volume on the inundation area of which ground had been subsided was 38 million m3. Because of the direct damage to paddy field crops and the difficulty in draining flood water, the importance of considering sediment deposition was pointed out. The issuance of heavy rain emergency warning was effective in establishing task forces at municipalities, and the hotline to the municipalities from river administrators worked effectively for decision making. Since synthetic judgment of large to small river was required, sharing both realtime and forecast water level, importance of improving knowledge about flood disaster process of citizens along river was pointed out. Thus, the integrated browser for flood disaster timeline has been developed.

  • KOBAYASHI Kenichiro

    Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kyoto University, 2010 - 2011, Principal investigator

    The purpose of the research is to develop, what we call, the Distributed Rainfall-Runoff/Flood-Inundation(DRR/FI) model which can simulate the rainfall-runoff and dike-break/inland flood inundation processes in an integrated/seamless manner. Until now, many physically-based rainfall-runoff models have been developed in such a way that the surface flow is routed with 1D kinematic wave model by deciding the flow direction a-priori of the simulation. However, in the model concept here, the surface flow is simulated with 2D dynamic wave model based on a Shallow Water equation, which thus enables the simultaneous routing of the runoff and flood inundation processes. Likewise 1D dynamic wave model is used with regard to the river flow instead of a 1D kinematic wave model. Thus the DRR/FI model can reproduce the backwater effect at the river confluences and outlets to the lake/ocean. Specifically, the Sayogawa river catchment model, Hyogo Prefecture, Japan and Yodogawa river catchment model in the Kansai area are developed with DRR/FI. These results are presented in e. g. Journals of Japan Society of Civil Engineers(JSCE). The catchment size of the Yodogawa river model is 8240km2. The application of such model concept as DRR/FI for such a large river basin is seldom seen in Japan. The model can simulate the flood inundation depth anywhere in the catchment though it requests the local calibration. In other words, after the calibration the model can estimate the flood hazard and risk based on the hazard anywhere in the catchment. The risk includes the economic losses due to the flood. Moreover, the dam operation rules are also incorporated in the DRR/FI model, thus the flood control capacity of the dam can also be considered. As the DRR/FI model can consider the spatio-temporal distribution of the rainfall, e. g. the Radar-Composite, Radar-AMeDAS and pseudo climate change experiment rainfalls are given to the DRR/FI model and the simulated results are summarized in the Journal papers. The interface with the evacuation model is also developed.