閉じた漂砂系の中で離岸堤を設置する場合の施工順序による地形変化の違い

摘要

Numerical simulation using the BG model (a 3-D model for predicting beach changes based on Bagnold's concept) was carried out to investigate topographic changes in a closed system of littoral drift, when six detached breakwaters were installed in a circular lake under the condition that winds blow in all directions with equal probability. The order of the installation of the six breakwaters was changed, and we examined how the installation order may affect the final shape of the lakeshore.%閉じた漂砂系の中での地形変化についての理解を促すために、均等確率で全方向から風が作用する条件の下で、円形の湖の中で施工順序を変えて6基の離岸堤を設置した場合の地形変化をBGモデル（Bagnold概念に基づく3次元海浜変形予測モデル）を用いて予測し、施工順序の違いが最終湖浜形状に及ぼす影響を調べた。