高波浪時における中砂成分の選択的流出に起因する海浜変形の再現

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  • Prediction of Beach Changes Due to Selective Discharge of Medium Sand during Storm Wave Conditions
  • コウハロウジ ニ オケル チュウ サ セイブン ノ センタクテキ リュウシュツ ニ キイン スル カイヒン ヘンケイ ノ サイゲン

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Uda et al. (2009) proposed a model for predicting beach changes due to rapid offshore sand transport during the storm wave conditions, assuming that the equilibrium slope of sand is reduced. In this model, the equilibrium slope was assumed to decrease regardless of the grain size, even though the beach material has a wide grain size range between gravel and fine sand. The sampling test after the storm revealed that gravel was remained on the foreshore and only medium sand was transported offshore. Therefore, the change in equilibrium slope corresponding to each grain size was incorporated in the contour-line-change model. The predicted and measured results were in good agreement.

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