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A nation-wide flood prediction modeling by reflecting regional characteristics of rainfall-runoff and river channels

Research Project

Project/Area Number 19H02248
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionKyoto University

Principal Investigator

Sayama Takahiro  京都大学, 防災研究所, 教授 (70402930)

Co-Investigator(Kenkyū-buntansha) 竹林 洋史  京都大学, 防災研究所, 准教授 (70325249)
寶 馨  京都大学, 総合生存学館, 教授 (80144327)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Keywords洪水予測 / 水文モデル / 降雨流出特性 / 河道地形 / RRIモデル / クリーガ曲線 / パラメータ地域統合化 / 地域統合化 / 土壌 / 地質
Outline of Research at the Start

観測水位の無い中小河川も含めて、日本全国の洪水を統一的に予測する技術を開発する。具体的には、降雨流出から洪水氾濫までを一体で解析するRRIモデルを空間解像度約150 mで日本全国に適用する。ベイズ推定に基づく全国モデルのパラメータ同定法を考案し、地質や土壌が洪水特性に及ぼす影響をパラメータ分布に反映させる。さらに、流域の地形、地質、年最大流量などが河道特性に及ぼす影響を全国規模で明らかにし、モデルの河道断面標準値を定める。同定したモデルを用いて、平成30年7月豪雨など近年発生した豪雨災害の解析を行い、日本各地で発生する洪水の流量、水位、氾濫の再現性を検証する。

Outline of Final Research Achievements

This study developed a nationwide Rainfall-Runoff-Inundation (RRI) model with a spatial resolution of approximately 150 m in Japan. It developed a parameter regionalization method that utilizes soil or geological distribution information. In addition, based on data from approximately 26,000 river cross-sections, the standard settings for the channel cross-section model of small and medium-sized rivers were determined. Subsequently, simulations were conducted recent major floods to verify the improvement of flood runoff and inundation reproducibility.
The nationwide RRI model, which incorporates the distribution of parameters reflecting soil maps, demonstrated improved accuracy in runoff prediction, with a median Nash coefficient of 0.87. Furthermore, the inclusion of numerous river cross-sections led to enhanced reproducibility of water level changes, particularly during flood events.

Academic Significance and Societal Importance of the Research Achievements

従来の洪水予測モデルは、特定の流域を対象に河川の流量を予測するものが一般的であった。それに対して、本研究では日本全国を対象に、河川流量・水位・浸水までを一体的に予測するモデルを構築した。とくに、そのパラメータの推定法について、土壌や地質の空間分布情報を用いたパラメータの地域統合化手法を提案した。本研究で用いたRRIと呼ばれる洪水予測モデルは、国や都道府県の洪水予測の実務でも利用されており、地域統合化や河道断面導入のためのアルゴリズムなどの開発技術は実務にも応用できる。また、モデル・観測比較を広域・多地点で評価することにより、水文現象、特に日本全国の降雨流出過程の解明にも結び付く。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (30 results)

All 2022 2021 2020 2019 Other

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (21 results) (of which Int'l Joint Research: 7 results,  Invited: 12 results) Remarks (1 results)

  • [Journal Article] FLOOD INUNDATION SIMULATION USING A LARGE-SCALE RAINFALL-RUNOFF-INUNDATION MODEL - EFFECTS OF TOPOGRAPHIC DATA CORRECTIONS -2022

    • Author(s)
      SAYAMA Takahiro、YAMADA Masafumi、SUGAWARA Yoshito、KONJA Atsuhiko、SEKIMOTO Taisei、YAMAZAKI Dai
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 78 Issue: 2 Pages: I_565-I_570

    • DOI

      10.2208/jscejhe.78.2_I_565

    • ISSN
      2185-467X
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] STUDY OF FLOW REPRESENTATION METHOD BASED ON D4PDF FOR MULTI-STAGE INUNDATION ASSUMPTION2022

    • Author(s)
      AJIMA Daiki、SAYAMA Takahiro
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 78 Issue: 2 Pages: I_451-I_456

    • DOI

      10.2208/jscejhe.78.2_I_451

    • ISSN
      2185-467X
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Numerical modeling of debris flows using basic equations in generalized curvilinear coordinate system and its application to debris flows in Kinryu River Basin in Saga City, Japan2022

    • Author(s)
      Takebayashi Hiroshi、Fujita Masaharu、Ohgushi Koichiro
    • Journal Title

      Journal of Hydrology

      Volume: 615 Pages: 128636-128636

    • DOI

      10.1016/j.jhydrol.2022.128636

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] DEVELOPMENT OF METHODOLOGY FOR INTRODUCING SURVEYED RIVER CROSS-SECTIONS INTO NATIONWIDE DISTRIBUTED HYDROLOGICAL MODEL THROUGHOUT JAPAN, AND ITS EFFECT ON WATER LEVEL PREDICTION ACCURACY2022

    • Author(s)
      YAMADA Masafumi、SAYAMA Takahiro、YAMAZAKI Dai、WATANABE Megumi
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 78 Issue: 1 Pages: 7-22

    • DOI

      10.2208/jscejhe.78.1_7

    • ISSN
      2185-467X
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] DEVELOPMENT OF A STORAGE DISCHARGE RELATIONSHIP TO REFLECT WATER RETENTION CURVE, AND ITS APPLICATION TO A DISTRIBUTED RUNOFF MODEL2021

    • Author(s)
      菅原 快斗、佐山 敬洋
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 77 Issue: 1 Pages: 124-135

    • DOI

      10.2208/jscejhe.77.1_124

    • NAID

      130008131382

    • ISSN
      2185-467X
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] アンサンブル予測を活用した長時間/広域洪水予測と社会実装2021

    • Author(s)
      立川康人、中安正晃、佐山敬洋
    • Journal Title

      河川

      Volume: 1月号 Pages: 86-92

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Ensemble flash flood predictions using a high-resolution nationwide distributed rainfall-runoff model: case study of the heavy rain event of July 2018 and Typhoon Hagibis in 20192020

    • Author(s)
      Takahiro Sayama, Masafumi Yamada, Yoshito Sugawara, Dai Yamazaki
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 7 Issue: 1 Pages: 75-75

    • DOI

      10.1186/s40645-020-00391-7

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 令和元年度台風19号による洪水災害と降雨流出特性2020

    • Author(s)
      佐山敬洋
    • Journal Title

      京都大学防災研究所年報

      Volume: 63A Pages: 82-90

    • NAID

      120006950476

    • Related Report
      2020 Annual Research Report
    • Open Access
  • [Presentation] 洪水災害に対する気候変動の影響と適応2022

    • Author(s)
      佐山敬洋
    • Organizer
      日本気象学会 第56回夏季大学 「気候変動とその影響」(講演)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 日本全国を対象にした広域洪水予測モデルの多地点精度検証2022

    • Author(s)
      佐山敬洋
    • Organizer
      水文・水資源学会/日本水文科学会2022年度研究発表会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Development of a High-Resolution Nationwide Distributed Rainfall-Runoff Model for Flash Flood Predictions2022

    • Author(s)
      Takahiro Sayama, Masafumi Yamada, Yoshito Sugawara, Kodai Yamamoto, Ayato Yamakita
    • Organizer
      AGU Fall Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Nation-wide Rainfall Runoff Inundation Modeling for Real-time Flood Forecasting and Risk Assessment in Japan2022

    • Author(s)
      Takahiro Sayama
    • Organizer
      2022 International Scientific Symposium on Water Resources Management and Comprehensive Reclamation of River Basins
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 洪水予測に関する最近の動向と日本全国の河川を対象にした研究2021

    • Author(s)
      佐山敬洋
    • Organizer
      京都大学防災研究所総合防災セミナー
    • Related Report
      2021 Annual Research Report
  • [Presentation] Ensemble Flash Flood Predictions Using a High-Resolution Nationwide Distributed Rainfall-Runoff Model: Case Study of the Heavy Rain Event of July 2018 and Typhoon Hagibis in 20192021

    • Author(s)
      Takahiro Sayama, Masafumi Yamada, Yoshito Sugawara, Dai Yamazaki
    • Organizer
      Joint Virtual Workshop on “Connecting global to local hydrological modelling and forecasting: scientific advances and challenges”, ECMWF- CEMS - C3S - HEPEX - GFP
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of a nationwide Rainfall-Runoff-Inundation model in Japan for flood forecasting and risk assessment (Invited)2021

    • Author(s)
      Takahiro Sayama, Masafumi Yamada, Yoshito Sugawara, Ayato Yamakita
    • Organizer
      Asia Oceania Geosciences Society (AOGS)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Impacts of Climate Change on Extreme Flood Events: Assessment with a High-resolution Nation-wide Rainfall-Runoff-Inundation Model2021

    • Author(s)
      Takahiro Sayama
    • Organizer
      The Fifth Convection-Permitting Modeling Workshop 2021 (CPM2021) High-Resolution Climate Modeling and Hazards
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 日本全国の中小河川を対象にした分布型洪水予測モデルのパラメータ地域統合化2021

    • Author(s)
      佐山敬洋、山田真史、菅原快斗、山北文登
    • Organizer
      水文・水資源学会/日本水文科学会2021年度研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Development of a High-resolution Nationwide Distributed Flood Forecasting System in Japan2021

    • Author(s)
      Takahiro Sayama
    • Organizer
      3rd JSCE-CCES Joint Symposium of Civil Engineerng
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Near Real-Time Flood Prediction using Rainfall-Runoff-Inundation (RRI) Model2021

    • Author(s)
      Takahiro Sayama
    • Organizer
      WRE-DAY (Organized by Chulalongkorn Univ. Thailand) (Invited Lecture)
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 水位・氾濫を一体的に予測する洪水予測の新展開2021

    • Author(s)
      佐山敬洋
    • Organizer
      京都府立大学 京の防災防疫安全安心研究センター開設記念シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 降雨流出現象の物理的モデリングと日本全国の洪水予測2021

    • Author(s)
      佐山敬洋
    • Organizer
      土木学会応用力学講演会「水理学・水文学のボーダーレス化と次世代治水対策の可能性を探る!」
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 日本全国の河川を対象としたリアルタイム広域洪水予測システムの開発2021

    • Author(s)
      佐山敬洋、山田真史、菅原快斗、山北文登
    • Organizer
      京都大学防災研究所 研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 日本全国を対象とした高解像度広域RRIモデルの開発と2020年台風10号を対象としたリアルタイムアンサンブル洪水予測への適用2021

    • Author(s)
      佐山敬洋・山北文登・山田真史・菅原快斗
    • Organizer
      京都大学防災研究所研究発表講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 日本全国を対象とした高解像度広域RRIモデルの開発と2020年台風10号を対象としたリアルタイムアンサンブル洪水予測への適用2021

    • Author(s)
      山田真史・佐山敬洋
    • Organizer
      京都大学防災研究所研究発表講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 日本全国を対象にした150 m分解能の降雨流出氾濫モデリング2021

    • Author(s)
      佐山敬洋
    • Organizer
      実践水文システム研究会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 長期洪水予測/広域洪水予測システムの研究紹介2020

    • Author(s)
      佐山敬洋
    • Organizer
      危機管理産業展2020
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Predictions of the Rainfall-Runoff-Inundation Model and Data Assimilation Technique for Real-time Flood Inundation Mapping2019

    • Author(s)
      Takahiro Sayama
    • Organizer
      Fall Meeting, American Geophysical Union
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Realtime Flood Inundation Mapping by Assimilating Local Flood Information to Ensemble Flood Simulations2019

    • Author(s)
      Takahiro Sayama
    • Organizer
      International Symposium of Hydrological Sciences and High-efficiency Water Resources Utilization under the Changing Environment (ISHW2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 日本全国の中小河川を対象にした洪水・氾濫予測の最新技術2019

    • Author(s)
      佐山敬洋
    • Organizer
      ぼうさいこくたい2019「あなたが知りたい防災科学の最前線:激化する気象災害に備える」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Remarks] 2020年9月台風10号を対象にした長時間アンサンブル広域洪水予測:予測と検証結果のまとめ

    • URL

      https://www.dpri.kyoto-u.ac.jp/news/14391/

    • Related Report
      2020 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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