COMPARISON OF FUNCTION OF L- OR T-TYPE GROIN BY NUMERICAL SIMULATION USING BG MODEL - EXAMPLE OF SHIMIZU COAST

Abstract

 Beach topography around the L-shape groin on the Shimizu coast was measured in detail, and the topography was reproduced using the BG model. Measured characteristics of the topography were well reproduced. Furthermore, the effect of controlling longshore sand transport by the L-shape groins was investigated numerically with changing the longshore length of the head part of the L-shape groin as 90, 120 and 150 m. The ratio of longshore sand transport relative to that with no groin were Q/Q₀=0.78, 0.75 and 0.73, respectively. The difference in reduction effect of longshore sand transport was minimal.