Abstract
Authors carried out numerical study on the topography change due to tsunami in the bay of Kesennuma when Chilean Tsunami had occurred. In the site, huge erosion was observed at the narrow strait and devastating sediment transport in the form of suspended sediment according to large tractive force was expected. We proposed some parameters on the topography change model in order to reappear such condition by means of numerical simulation. In comparison with the observed bathymetry, it was verified that the effect of moving bed condition had to be considered in the equivalent roughness coefficient and vertically uniform eddy diffusivity with the turbulence scale around 1.0 to the depth well reproduced horizontally eliminated sediment transport under the tsunami.
