STUDY OF MULTI-LEVEL SIMULATION MODEL FOR STORM SURGE CONSIDERING DENSITY STRATIFICATION AND WAVE SETUP

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  • SHIBAKI Hidenori
    社団法人土木学会 株式会社エコー環境水工部
  • WATANABE Akira
    社団法人土木学会 東京大学工学系研究科社会基盤工学専攻

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  • 密度成層と Wave Setup を考慮した多層高潮推算に関する研究
  • ミツド セイソウ ト Wave Setup オ コウリョ シタ タソウ タカシオ スイサン ニ カンスル ケンキュウ

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Abstract

In order to clarify the effects of seawater density stratification, topography-dependent winds within an embayment, and wave set-up, on the storm surge level, we carried out a storm surge computation for the Ise-Wan Typhoon which struck the Ise Bay area in 1959. We employed a multi-level model that takes into account the density stratification and the wave set-up for the storm surge. A spectral shallow water model was employed for the wave hindcasting.<br>Obtained results are as follows: seawater density stratification increases the tide level deviation by approximately 20-30cm near the coast. Topography-dependent winds within an embayment causes variations of the tide level deviation by approximately 30cm. In addition, the wave set-up increases the tide level deviation by approximately 50cm on open coasts that face the ocean. By introducing these factors into storm surge computation, more accurate prediction of tide level deviations can be obtained.

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