Interactions of Morphology Change and Wave and Current Fields around a River Mouth under Severe Flood

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  • 砂州の決壊を伴う大出水時における波・流れ干渉場の変動特性とその再現モデル
  • サス ノ ケッカイ オ トモナウ ダイ シュッスイジ ニ オケル ナミ ナガレ カンショウバ ノ ヘンドウ トクセイ ト ソノ サイゲン モデル

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This paper studies on interactions between morphological changes and wave and current fields around the river mouthduring severe storm. Installing six cameras, authors successfully captured the sand bar collapse around the Tenryu rivermouth when typhoon T0704 hit the site in 2007. Obtained images were analyzed with several image processing techniqueand, coupled with the other hydrodynamic data, showed clear evidence for interactive features of morphology changesand wave and current fields. Finally, numerical model based on depth-integrated non-linear shallow water equations wasapplied to the observed conditions and it was found that topography changes during the storm is one of the most essentialfactors that determine the characteristics of surrounding wave and current fields.

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