INTEGRATED MULTISCALE COMPUTATION OF TSUNAMI RUN-UP AND INUNDATION IN THE KITAKAMI RIVER BY THE NON HYDROSTATIC QUASI-3D MODEL

Abstract

 For simulation of tsunami run-up in rivers and inundation, a numerical computation method which can evaluate three dimensional flows is required to simulate several phenomena integrally. In this study, we developed a non-hydroststic quasi-3D tsunami simulation model based on the general BVC method, newly considering the unsteady term of vertical velocity and the vertical pressure gradient term on water surface. First, the present model was applied to the tsunami run-up experiments. The model was validated through the comparisons with the experimental results. Then, we applied it to the 2011 Tohoku Tsunami in the Kitakami River. Altough calculated water levels were higher than observed ones, the model reproduced water levels of tsunami traces and the arrival time.