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Hydraulic Characteristics of River Flood Flows under Storm Conditions Assuming a Super Typhoon

Research Project

Project/Area Number 21K20451
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research InstitutionTokyo University of Science

Principal Investigator

Kashiwada Jin  東京理科大学, 理工学部土木工学科, 助教 (10774549)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsスーパー台風 / 気候変動 / 氾濫リスク / 三次元河川流計算モデル / 吹送流 / 風影響 / 乱流モデル / LES / 河川洪水流 / 暴風
Outline of Research at the Start

本研究では,気候変動に伴い予測されるスーパー台風襲来時の河川洪水・暴風同時生起時において,暴風条件が河川洪水流に及ぼす影響を明らかにする.そのため,計算効率性の高い三次元河川流モデルと一般的な気象モデルをカップリングし,実地形を考慮して河川の長区間解析が可能な「大気―河川結合モデル」を新たに構築する.現地観測データに基づく検証を経た本モデルを用い,暴風条件下の河川洪水流特性(吹送流の三次元構造の時空間発展過程,流下・横断方向の水面勾配等)を明らかにし,洪水流水理に対する風影響の重要性を示す.

Outline of Final Research Achievements

This study investigated the hydraulic characteristics of river flood flows during the simultaneous occurrence of flooding and strong winds during a super-typhoon attack. To accurately evaluate the effects of wind on flood flows, three-dimensional flow simulations were performed for an ideal channel and an actual river channel. The analysis focused on the development of the drift current and the increase in water level in several wind conditions; forward, headwind, and crosswind in the direction of the river’s own flow. In the actual river, the results indicate that the wind influences the flow velocity and the water level, and that the increase in water level caused by the wind during the rising stage could propagate as surface waves and remain until the peak of the flood.

Academic Significance and Societal Importance of the Research Achievements

気候変動の影響予測は水工学における重要なテーマの一つである.将来の洪水氾濫リスクを評価する研究では,降水量の増大はモデル上流端流量の増大として,河口部における気圧低下や風の作用はモデル下流端水位(潮位)の上昇として,境界条件を見直す形で考慮されているが,河川水表面への風応力の作用について考慮した研究例はない.すなわち,既往研究では風影響を無視しており,気候変動影響下における風の取扱いの妥当性には自ずと疑問が生じる.本研究では,洪水流と暴風の同時生起を想定した三次元流動計算を行うことで,風が流動に与える影響を定量的に評価した.その結果は,今後の河川流計算における風影響の考慮の重要性を示唆した.

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2023 2022

All Journal Article (6 results) (of which Peer Reviewed: 5 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] 河川流・氾濫流一体解析による令和2年球磨川水害における建物流失率の検討2023

    • Author(s)
      柏田仁,窪田利久,平本達典,山田真史,佐山敬洋,二瓶泰雄
    • Journal Title

      河川技術論文集

      Volume: 29

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 国内外の河川流・氾濫流解析モデルのレビュー~3次元モデルに着目して~2023

    • Author(s)
      柏田仁,二瓶泰雄
    • Journal Title

      河川技術論文集

      Volume: 29

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 3-D NUMERICAL SIMULATION ON RESPONSE OF VELOCITY AND WATER LEVEL IN FLOOD FLOW AGAINST WIND STRESS OF STORM CONDITIONS2022

    • Author(s)
      遊佐 望海, 柏田 仁, 二瓶 泰雄
    • Journal Title

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

      Volume: 78 Issue: 2 Pages: I_13-I_18

    • DOI

      10.2208/jscejhe.78.2_I_13

    • ISSN
      2185-467X
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A High Accurate and Efficient 3D River Flow Model with a New Mode-Splitting Technique2022

    • Author(s)
      Jin Kashiwada, Yasuo Nihei
    • Journal Title

      Proceedings of the 39th IAHR World Congress

      Volume: 39 Pages: 4087-4090

    • DOI

      10.3850/iahr-39wc2521711920221420

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A HIGH ACCURATE AND EFFICIENT 3D RIVER FLOW MODEL WITH A NEW MODE-SPLITTING TECHNIQUE2022

    • Author(s)
      Jin Kashiwada and Yasuo Nihei
    • Journal Title

      Proceedings of the 39th IAHR World Congress

      Volume: 39

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] 三次元河川流・氾濫流一体解析による球磨川水害における家屋被災リスクの分析2022

    • Author(s)
      柏田仁,尾形勇紀,二瓶泰雄,山田真史,佐山敬洋
    • Journal Title

      土木学会年次学術講演会

      Volume: 77

    • Related Report
      2021 Research-status Report
  • [Presentation] 河川流・氾濫流一体解析による令和2年球磨川水害における建物流失率の検討2023

    • Author(s)
      柏田仁
    • Organizer
      2023年度河川技術に関するシンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 国内外の河川流・氾濫流解析モデルのレビュー~3次元モデルに着目して~2023

    • Author(s)
      二瓶泰雄
    • Organizer
      2023年度河川技術に関するシンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 暴風作用下における河川洪水流の流速・水位応答に関する三次元数値解析2022

    • Author(s)
      遊佐望海
    • Organizer
      第67回水工学講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] A High Accurate and Efficient 3D River Flow Model with a New Mode-Splitting Technique2022

    • Author(s)
      Jin Kashiwada
    • Organizer
      the 39th IAHR World Congress
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A HIGH ACCURATE AND EFFICIENT 3D RIVER FLOW MODEL WITH A NEW MODE-SPLITTING TECHNIQUE2022

    • Author(s)
      Jin Kashiwada
    • Organizer
      Proceedings of the 39th IAHR World Congress
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 三次元河川流・氾濫流一体解析による球磨川水害における家屋被災リスクの分析2022

    • Author(s)
      柏田仁
    • Organizer
      第77回土木学会年次学術講演会
    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2024-01-30  

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