CHARACTERISTICS OF SEDIMENT TRANSPORT IN THE SWASH ZONE UNDER MIXED GRAIN SIZE

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  • 混合粒径下における波打ち帯の漂砂移動特性
  • コンゴウ リュウケイ カ ニ オケル ナミウチ タイ ノ ヒョウサ イドウ トクセイ

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Abstract

 The characteristics of sediment transport according to saturation of the sand slope under mixed grain size are investigated experimentally and numerically. The movement of fluorescent sands with different colors for each grain size are measured in solitary wave experiments. As the result, in the case of saturated condition, the sediment transport becomes larger constantly due to uplift force of the seepage flow. In particular, increasing of the fine sand components is significantly. This phenomenon leads to coarse granulation of bottom sediment and steepening of the foreshore gradient accelerates even further. A numerical approach of tractive force for respective grain sizes of sand mixtures is presented, that is quantified through a permeable Shields parameter. The results of prediction are in good qualitative agreement with those of experiments.

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