Fluid Motion around Coastal Dyke due to Overflowing Tsunami

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  • 津波越流時の堤防周辺における流体運動の分析
  • ツナミエツリュウジ ノ テイボウ シュウヘン ニ オケル リュウタイ ウンドウ ノ ブンセキ

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Abstract

Fluid motion around a coastal dyke due to overflowing tsunamis was investigated by conducting hydraulic experiments and analyzing videos recorded during the 2011 Tohoku Earthquake and Tsunami. The results of the hydraulic experiments showed that overflowing tsunamis could be classified into three types, and velocity field around coastal dykes and pressure acting on coastal dykes were different in these three types. This classification can be helpful to consider the mitigation of damage on coastal dykes. The videos showed that the type of overflowing tsunamis around coastal dykes varied with the location, and this type was considered to have an influence on how overflowing tsunamis affected coastal dykes in the 2011 tsunami.

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