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Efficiency improvement and validation of probabilistic tsunami inundation hazard assessment

Research Project

Project/Area Number 21K14391
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 25030:Disaster prevention engineering-related
Research InstitutionKanto Gakuin University

Principal Investigator

Fukutani Yo  関東学院大学, 理工学部, 准教授 (10785322)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords津波 / 確率論的津波ハザード評価 / 固有直交分解 / ガウス過程回帰 / 津波数値計算 / BPT分布 / 防潮堤 / 破堤確率 / モード分解 / 不確定性 / 特異値分解 / 津波浸水深 / 計算効率
Outline of Research at the Start

津波災害に対する事前の対策を実施するためには、陸域での浸水深、浸水領域、流速等のハザードを事前に評価することが重要となる。陸域の浸水ハザード評価は一般に多大な不確実性を有するため、確率論的評価が有効であるが、その計算負荷は多大である。本研究では、津波の浸水ハザードを、計算負荷を抑え、効率的に予測可能な空間モード分解・結合を用いた実用的な確率論的評価の枠組みを用い、最終的には、地震の発生確率モデルを組み合わせ、再現期間毎の津波浸水深分布を評価する。また、物理方程式により直接計算した浸水深分布と空間モード結合により得られる浸水深分布を比較し、検証を行うことで、評価結果の信頼性向上を目指す。

Outline of Final Research Achievements

We have proposed a method for efficiently and accurately analyzing computationally demanding probabilistic inundation evaluations by mode decomposing a large number of inundation depth distributions considering multiple uncertainties in the process from tsunami generation to inundation. We also incorporate statistical analysis to examine the outcomes. Our analysis not only considers conventional parameters related to earthquake faults, which have been traditionally used in probabilistic tsunami inundation assessment, but also factors in uncertainties that significantly influence the extent of inundated land, such as the probability of seawall rupture. The results obtained from our study include the spatial distribution of the probability of inundation depths reaching 1 meter or more within the next 50 years or 10 years in the specified area.

Academic Significance and Societal Importance of the Research Achievements

本研究では、各地域での津波浸水深の発生確率を効率的に評価する手法を提案した。固有直交分解を用いて、地震断層の不確定性に加えて、防潮堤の破堤確率も考慮した手法を構築したことは、学術的な意義が高い。提案手法を用いることで、沿岸部に防潮堤のある地域での陸域の津波浸水深の発生確率を、短期間で精度良く評価可能となるため、津波浸水確率を考慮した防災まちづくり計画や確率論的津波リスク評価等に利用されることが期待できる。

Report

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

    (8 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Efficient probabilistic prediction of tsunami inundation considering random tsunami sources and the failure probability of seawalls2023

    • Author(s)
      Fukutani Yo、Yasuda Tomohiro、Yamanaka Ryoichi
    • Journal Title

      Stochastic Environmental Research and Risk Assessment

      Volume: 37 Issue: 6 Pages: 2053-2068

    • DOI

      10.1007/s00477-023-02379-3

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 津波ハザード評価の不確定性について2022

    • Author(s)
      福谷陽
    • Journal Title

      関東学院大学理工学部教養学会 科学/人間

      Volume: 52 Pages: 195-205

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Time‐Dependent Probabilistic Tsunami Inundation Assessment Using Mode Decomposition to Assess Uncertainty for an Earthquake Scenario2021

    • Author(s)
      Fukutani Yo、Moriguchi Shuji、Terada Kenjiro、Otake Yu
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 126 Issue: 7 Pages: 1-29

    • DOI

      10.1029/2021jc017250

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 浸水分布のモード分解による確率論的津波浸水評価の効率化2022

    • Author(s)
      福谷陽、安田誠宏、山中亮一
    • Organizer
      第69回海岸工学講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 津波数値計算における格子間隔の違いによる浸水計算誤差の考察2022

    • Author(s)
      和田拓己、土橋柊斗、福谷陽
    • Organizer
      第50回土木学会関東支部技術研究発表会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Probabilistic tsunami inundation assessment using mode decomposition method ーA case study for Kamakura cityー2021

    • Author(s)
      Yo Fukutani
    • Organizer
      30th International Tsunami Symposium
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Probabilistic tsunami inundation assessment for the maximum possible earthquake2021

    • Author(s)
      Yo Fukutani
    • Organizer
      17th World Conference on Earthquake Engineering
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 津波荷重評価に用いる水深係数のモード分解による空間的不確実性評価2021

    • Author(s)
      福谷陽
    • Organizer
      2021年度日本建築学会大会(東海)研究集会 陸上建物の津波荷重に関する研究の現状
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2024-01-30  

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