3D numerical simulation of tsunami runup

This paper describes two 3D numerical models to simulate tsunami phenomena including runup onto a complex beach. The governing equations are the continuity and Navier-Stokes equations for incompressible fluids in porous media. In the first model the water surface displacement is determined by the vertically integrated equation of continuity, while in the second model by the 3D-VOF method. Topography of seabed can be smoothly expressed with a porous model. These two models were applied to the 1993 Okushiri tsunami and the runup has been simulated. The results by calculation are compared with those by the existing laboratory experiment.