A NOVEL EMPIRICAL VELOCITY PROFILE OF RIGID SUBMARINE LANDSLIDE-GENERATED TSUNAMI WAVES ON INCLINED PLANES

Landslides and landslide-generated tsunami waves arbitrarily happen and cause tremendous hazards to human lives worldwide. Among the recent landslide tsunami events, the rigid submarine landslide sources are becoming more and more concerned due to their mysteries. Dynamical properties of rigid submarine landslides (e.g., velocity) play an important role in the generated tsunami waves. In this study, an empirical velocity profile of rigid submarine landslide-generated waves on an inclined plane is proposed. This new velocity profile is suggested from the velocity profile in a physical experiment of the horizontal rigid submarine landslidegenerated waves. A new FLOW-3D HYDRO package is employed to conduct the rigid submarine landslidegenerated waves experiment. We first verified the chosen numerical model to the experimental data of rigid submarine landslides moving horizontally. Following the rigid velocity profile on the horizontal plane, we propose a new method to apply it on the inclined plane. The error norm technique is used to find out the empirical velocity profile among 10 critical velocity profiles applied. The novel empirical velocity profile of the critical case of m = 3 as well as critical velocity value of Vc = 0.82 m/s is used to generate tsunami waves, which are in good agreement with the experimental data and better than those of other similar three-dimensional numerical models.