ID | 118754 |
Title Alternative | DIFFERENCES ON DIFFERENT FIDELITY LEVEL IN MODELING OF BUILDING AND EMBANKMENT HEIGHT ON TSUNAMI RUN UP SIMULATION BY 2D FINITE DIFFERENCE METHOD
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Author |
Nakaya, Naoki
Asai, Mitsuteru
Masagaki, Shota
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Keywords | finite difference method
2D tsunami run-up simulation
tsunami arrival time
Kochi-city
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Content Type |
Journal Article
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Description | 将来発生すると危惧される巨大津波に対する防災計画には,津波による沿岸地域への安全性・危険性を把握することが重要であり,浸水域が的確に推定できる手法が必要となる.実務業務では,津波伝搬から遡上までの津波シミュレーションを2次元解析により実施しているが,3次元問題として取り扱うべき問題に対する誤差が無視できないとの指摘もある.しかし,現状ではスパコンなどの大型計算機を使用しなければならず,実務への直接的な応用は困難である.そこで,本研究では2次元差分解析の範疇のまま,空間分解能を上げることで家屋等の建築物をできる限り忠実にモデル化し,従来の粗度係数を用いた計算結果と比較検討することで津波遡上解析に与える違いを評価し,特に津波遡上解析における注意事項を整理した.
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Description Alternative | It is important in disaster prevention planning to grasp safety and danger of coastal area against predicted future huge tsunami, and an accurate numerical simulation method is strongly desired. In practical works, tsunami simulations for tsunami propagation and run up into ground is carried out by 2D simulation, but it is pointed out that some numerical errors especially in the tsunami run up simulation, which should be treated as a 3D problem, can not be ignored. It is necessary for the 3D simulation with the current computer power to utilize a super computer, and it is almost impossible to apply directly to practical use. Therefore, in this research, we tried to model houses, building and embankments as precisely as possible within framework of the 2D simulation. Numerical results by the 2D finite difference method with different level of fidelity of structure modelling gave us quite different results especially in the tsunami arrival time.
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Journal Title |
Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))
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ISSN | 21854653
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Publisher | 土木学会
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Volume | 74
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Issue | 4
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Start Page | I_1052
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End Page | I_1061
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Published Date | 2018
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Rights | © 2018 公益社団法人 土木学会
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language |
jpn
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Publisher
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departments |
Science and Technology
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