2022 Fiscal Year Final Research Report
Investigation of the Amplification Mechanism of Tsunamis Generated by Multiple Landslides and Development of their Prediction Method
| Project/Area Number |
19K15104
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22040:Hydroengineering-related
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| Research Institution | Kindai University (2021-2022)
Waseda University (2019-2020) |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 津波 / 地すべり津波 / 地すべり / 非線形性 / 簡易予測式 / 津波避難シミュレーション / 津波避難 |
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| Outline of Final Research Achievements |
In the present study, I performed hydrodynamic experiments and numerical simulations targeting multiple landslide-generated tsunamis. As a result, the present study revealed that: (1) landslide-generated tsunamis, being predominantly classified as nonlinear waves, cannot be accurately represented by a simple superposition when overlapping, for the maximum water level; (2) to predict the height of the multiple landslide-generated tsunamis, it is necessary to add a safety margin of several percent to the prediction equations for the maximum water level of a single landslide-generated tsunamis, derived in the present study, or to use a numerical simulation model that can consider both nonlinearity and dispersion effects; (3) as landslide-generated tsunamis could potentially strike immediately after an earthquake occurs, it is necessary to formulate appropriate evacuation plans against landslide-generated tsunamis.
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| Free Research Field |
海岸工学
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| Academic Significance and Societal Importance of the Research Achievements |
地すべりによって発生する津波のメカニズムを解明し，その最大高さを予測可能にすることは，社会と人命を守るために非常に重要である．本研究では，地すべり津波を対象として水理実験と数値解析を行い，地すべり津波のメカニズムを分析するとともに，その高さを予測する手法を開発した．また，地すべりが複数発生した場合にも津波高さを予測する手法についても考察し提案した．さらに，地すべり津波から有効に避難を行うためには，通常の地震津波による避難計画に加えて，地すべり津波に対応した避難計画の策定が必要であることを示した．
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