Relation between Disaster and Configurations of Breakwaters on the Tohoku-Pacific Ocean Earthquake Tsunami

Hiroshi UTSUMI, Takeshi NISHIHATA, Katsuhiro SHINMYO, Susumu KAWAMATA
2013 Journal of Japan Society of Civil Engineers Ser B2 (Coastal Engineering)  
In this study, numerical simulations for the Tohoku-Pacific Ocean earthquake tsunami are executed to reproduce the tsunami disaster in the Haramachi port. The configuration of main breakwaters which consists of trapezoidal caisson with sloping top seemed to suppress a devastating damage due to the tsunami. So not only the trapezoidal caisson but redesigned square type breakwater is assumed and compared through the numerical computing to inspect wave force around the breakwaters and current
more » ... on the block mounds. Pushdown force on the sloping top restricts caisson sliding and armor blocks with large void ratio decrease uplift pressure. In addition, height of the trapezoidal coping position taller than that of square coping turns out to weaken the overtopping flow into the block mound not to cause the mound scour.
doi:10.2208/kaigan.69.i_316 fatcat:6anrbrhtkje67kgtq5hxq3b5wm