CHARACTERISTICS OF THE TSUNAMI WAVE REFLECTION FROM THE BEACH

ABSTRACT It is well known that reflection from the complex relief of the continental slope can significantly affect the runup of a long wave on the beach and significantly increase the destructive impact on the coast. In this paper, we consider the reflection of long waves from a plane slope and from a slope conjugated with even bottom. The problem is considered both for a monochromatic wave and for an arbitrary initial perturbation. Using the "vertical wall" and "plane slope" approximations, the reflection coefficients and the solution for the reflected wave are obtained. Numerical simulation is carried out for the case of reflection of the "Lorentz pulse" from the slope, which is conjugated with even bottom. The results obtained are in good agreement with the available results, both an analytical study of the process and numerical modeling of runup of an arbitrary initial perturbation with taking into account of reflection from the shore