NONLINEAR WATER-WAVES GENERATED BY SUBMARINE AND AERIAL LANDSLIDES

The two-dimensional hydrodynamics program Nasa-Vof2D is modified to study the generation, propagation, and run-up on the shore of water waves created by landslides. Nasa-Vof2D, developed by the Los Alamos National Laboratory in Los Alamos, New Mexico, is a nonlinear Eulerian code, which solves the complete incompressible Navier-Stokes equations by a finite difference method. The modification includes making the fluid domain boundaries (i.e., the bathymetry) time-dependent. It allows a complex geometry box to slide down any incline. provided that the body kinetic is known and that the phenomenon is two-dimensional or axisymmetric. To verify this numerical Nasa-Vof2D extension. an experimental study on nonlinear waves generated by a two-dimensional triangular body sliding a 45-degrees inclined plane is conducted. The computed wave profiles show very close agreement with the experimental ones, except when free-surface turbulence occurs, which the present numerical method cannot simulate.