Abstract
The tsunami run-up in the Kamaishi city caused by the 2011 off the Pacific coast of Tohoku Earthquake was simulated numerically by the 2-D shallow water model with fine grids resolving the roads and buildings. Additionally, a new semipermeable building model was conducted to considering the water volume flooded into the buildings. Compared with the ordinary model which considers the effect of buildings by adjusting the Manning's roughness coefficient, the maximum water levels in our model has higher correlation with the tsunami traces. In the coastal area, our calculations gave time series of water depth more consistent with the observation by the digital photo analysis. It means that the numerical accuracy gets improved by considering the collapse of buildings. In addition, it is shown that this model can estimate the tsunami time travel more reasonably than the ordinary model.
