Multi-Directional random wave transformation model based on energy balance equation

摘要

The purpose of this paper is to develop a prediction model for multi-directional random wave transformation. The wave prediction model is based on an energy balance equation with an energy dissipation term and a newly formulated wave diffraction term from a parabolic approximation wave theory; the wave model is stable when solved numerically. The model calculations are carried out for three cases: the first case is the wave transfor- mation through a gal between two breakwaters and the predictions are compared with the Solutions of the Sommerfeld diffraction theory; the second case is the wave deformation due To an elliptic shoal and the prediction are compared with the experimental observations; The third case is the transformation of swells propagating into the Osaka Bay through Narrow channels. These model calculations showed that the proposed wave model gives Reasonable predictions.