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Tsunamis are ocean waves generated by movements of earth's crust. Several geophysical events can lead to this kind of catastrophe: earthquakes, landslides, volcano eruptions and other mechanisms such as underwater explosions. Recently, the great 2011 earthquake in Japan caused by a tsunami, and the tsunami ravaged Kesennuma port. After, needs about simulations of the tsunami on coastal damage are increased. Most of the damage associated with tsunamis are related to their run-up on shoreline. Therefore, well predicting the run-up process is an important aspect of any seismic sea wave mitigation effort.

But, Tsunami has strong nonlinear free surface behavior. So we were used particle method to Tsunami study. But MPS(Moving Particle Simulation) and SPH(Smoothed Particle Hydrodynamics) methods have some serious disadvantages for pressure. The pressure field shows spurious high fluctuation both temporally and spatially.

In this study, we modified PNU-MPS. The developed method was applied to the hydro-static pressure and dam broken problems. And then, a solitary wave traveling over shallow water with slope is numerically simulated and the results are compared with experiments and other numerical results. Finally, the behaviors of a floating body with different drafts are investigated numerically.

It is seen that the refined PNU-MPS method is very useful and applicable to simulate the coastal inundation and disaster due to tsunami.

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