SORTING AND SELECTIVE MOVEMENT OF SEDIMENT ON COAST WITH STEEP SLOPE- MASUREMENTS AND PREDICTION

Proceedings of the International Conference on Coastal Engineering

Toshiro San-nami¹  Toshinori Ishikawa²  Masumi Serizawa¹  Takaaki Uda² 

[1] Coastal Engineering Laboratory Co., Ltd.;Public Works Research Center

关键词: Shimizu coast;    beach changes;    beach nourishment;    measure against beach erosion;    contour-line-change model;   

DOI  :  10.9753/icce.v32.sediment.105

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

“Conveyer belts” carrying gravel and fine sand have developed on the Shimizu coast. After the construction of an L-shaped groin to protect the Hagoromo-no-matsu sandy beach located at the northern part of the Shimizu coast, these conveyer belts split into two, inducing longshore and offshore transport, because the seabed topography markedly changes and submarine canyons with a steep offshore slope develop immediately north of the L-groin. Coarse material is transported alongshore and fine material is discharged offshore. Material movement is investigated on the basis of bathymetric survey data and the depth distribution of the grain size of the seabed material. The effect of extending four breakwaters to control the movement of gravel and to stabilize the shoreline downcoast of the L-groin is predicted using the contour-line-change model. The optimum arrangement of breakwaters, along with beach nourishment, is numerically predicted.

【 授权许可】

Unknown