PREDICTION OF BEACH EROSION CAUSED BY REDUCTION OF FLUVIAL SAND SUPPLY DUE TO EXCESS SAND MINING AND BEACH RECOVERY AFTER PROHIBITION OF MINING

Proceedings of the International Conference on Coastal Engineering

Toshiro San-nami¹  Hitoshi Iwamoto³  Shiho Miyahara¹  Toshinori Ishikawa²  Masumi Serizawa¹  Norikazu Ohashi³  Takaaki Uda² 

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

关键词: beach erosion;    sand body;    contour-line-change model;    Shizuoka coast;    sand mining;   

DOI  :  10.9753/icce.v33.sediment.61

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Long-term topographic changes since 1968 along the entire Shizuoka and Shimizu coasts including a 17 km stretch extending between the Abe River mouth and the tip of the Mihono-matsubara sand spit were investigated. Beach erosion of these coasts was triggered by the decrease in sediment supply from the Abe River due to excessive riverbed mining until 1967. After 1982/1983, natural sand supply from the river increased and accretion occurred on these coasts. Measured topographic changes were reproduced using the contour-line-change model considering changes in grain size. Not only the movement of the sand body but also the shoreline and bathymetric changes were numerically reproduced. The calculated results were in good agreement with the measured topographic changes.

【 授权许可】

Unknown