ANALYSIS OF IMPULSIVE TSUNAMI FORCE ACTING ON TIDAL BARRIER BEHIND COASTAL DUNE

A hilly topography protected in the intrusion of tsunami due to the 2011 Great East Japan Earthquake in a northern coastal flat area. Similar topography like sand dunes may be effective to reduce the tsunami force acting on tidal barriers behind them. Some atomic power stations are located behind such coastal dunes in Japan. In the paper, the reduction effect of the dunes for tsunami force was investigated in experiments and a numerical model to design the tidal barrier of the atomic power stations.