Characteristics of Run-up Tsunami with Sea Ice Floes in Urban Area

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  • 海氷群を伴った市街地への津波遡上特性に関する検討
  • カイヒョウグン オ トモナッタ シガイチ エ ノ ツナミ ソジョウ トクセイ ニ カンスル ケントウ

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Abstract

We made model experiments on run-up tsunami inunduation flow with sea ice floes in an urban area. After the collision force of ice acts on structures, flow is dammed up due to the formation of Ice-jam between the structures, and large static force also acts on the structures because of water level rise and water pressure between the structures due to the jamming. The steady state is kept for a while. While we developed a simple mechanical model for estimation of the water depth and the tsunami force at the steady state, we compared calculated values by this model with experimental ones to verify the validity of the model. Further, in the design of facilities with openings such as windows and pilotis, we proposed that the design force by tsunami current acting on such parts should not be reduced because of the jamming.

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