Hydraulic model experiments on scour landward of the coastal dike induced by tsunami overflow

Abstract

Coastal dikes in prefectures of Iwate, Miyagi and Fukushima were damaged by tsunami of The 2011 off the Pacific coast of Tohoku Earthquake in March 11, 2011. We focused on the damage from scour landward of the coastal dike induced by tsunami overflow, and examined the process of scour and the effects of landward toe protection on scour by hydraulic model experiments. The results of the experiments show that landward toe protection with high watertightness can keep scour away from coastal dike by surely bouncing overflowed water.