Abstract
The well-known destructive tsunami triggered by 2011 great Tohoku earthquake in East Japan has shown that the existing tsunami breakwaters are not enough to prevent big tsunamis. Some breakwaters were completely collapsed by earthquakes or tsunamis. It was found out that, even though in the intact condition from the tsunami attack, the existing tsunami breakwaters were insufficient for sheltering corresponding harbor and coastal areas, typically in Ofunato Bay. In order to solve the tsunami disaster problem, the control function of tsunami breakwaters was revised and improved as compared to the previous one. Especially, the 3-D structure of the opening mouth of tsunami breakwater is a major point of this study.
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