FIELD OBSERVATION OF MOVEMENT OF SAND BODY DUE TO WAVES AND VERIFICATION OF ITS MECHANISM BY NUMERICAL MODEL

Proceedings of the International Conference on Coastal Engineering

Naoki Itabashi¹  Kosuke Yamaji¹  Takaaki Uda²  Yoshimichi Yamamoto¹ 

[1] Coastal Engineering Department, INA Corporation;Research Coordinator for Hydraulic Structures, Public Works Research Inst., Ministry of Const.

关键词: numerical model;    field observation;    sand body;    model verification;   

DOI  :  10.9753/icce.v24.%p

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Bottom sounding data collected from 1983 to 1993 on the Shizuoka coast were analyzed. The results reveal the existence of a sand body moving downcoast at a velocity of about 233m/yr. It is the first time that this kind of phenomenon was observed in the quantitative sense including the spatial and temporal changes in longitudinal profile of the beaches, and this propagation mode is a very interesting phenomenon. In this study, sand movement shoreward and offshoreward of the detached breakwaters is modeled, and a model to predict successive contour line changes is developed, taking into account of time lag caused by the obstruction effect of longshore sand transport due to the detached breakwater. The new phenomenon observed on the Shizuoka coast is well explained by the present model. The propagation velocity of the sand body reproduced by this model is 230m/yr and it is well in agreement with the field observation value.

【 授权许可】

Unknown