2022 Fiscal Year Final Research Report
Quantification of tsunami amplification effects due to bathymetry considering frequency characteristics for real-time prediction
| Project/Area Number |
20K22432
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2023-03-31
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| Keywords | 津波 / 周波数応答 |
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| Outline of Final Research Achievements |
Tsunami responses in frequency domain due to bathymetry effect were quantitatively obtained. First, tsunami simulations were performed for the Nankai Trough earthquakes using a stochastic fault generation model. From the tsunami simulation results, the tsunami response functions were obtained by performing a spectral analysis of the simulates tsunami waveforms in the source and coastal regions. The obtained response were validated by comparing them with the resonance periods estimated from the linear wave theory. As a result, the predominant periods corresponding to each scale in the tsunami propagation process was extracted by ensemble of spectral ratios among the scenarios. The extracted response functions are consistent with the theoretical resonance period under simplified topographic conditions, indicating the validity of the method.
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| Free Research Field |
海岸工学
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| Academic Significance and Societal Importance of the Research Achievements |
津波や高潮などの長波の挙動は海底地形の影響を大きく受ける．本研究では，地形によって津波がどのよに応答し，沿岸域でどのように増幅するかを定量化した．この応答は，外洋から沿岸部へ進行する津波の変化を予測しうるものであり，即時予測手法の改良や沿岸域での津波の継続時間の予測への応用が期待される．
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