NUMERICAL SIMULATION OF SCOURING BEHIND THE SEAWALL CAUSED BY TSUNAMI OVERFLOW WITH ACCURATE ISPH METHOD

Abstract

 At The 2011 off the Pacific coast of Tohoku Earthquake, many seawalls were damaged by Tsunami overflow. Some previous studies indicated that if the foundation of structures was scoured, the stability of structures seriously declined, but the relationship between scouring depth and overflow hasn't been well understood and prediction method hasn't also established. In this study, the scouring depth caused by tsunami overflow was calculated by using numerical simulation based on accurate ISPH method and the results were compared with the physical model tests. The results of this study are as follows; 1) There is a high proportional relationship between scouring depth and the overflow depth, 2) The scouring behind the seawall can be reproduced and the maximum scouring depth can be evaluated by accurate ISPH method.