NUMERICAL-SIMULATION OF ABNORMAL WAVE HEIGHT CHANGE INDUCED BY EXCAVATED WATERWAY WITH BOUSSINESQ EQUATION

A nonlinear numerical model has been set up by use of Boussinesq Equat ion with finite difference method, and has been applied to the simulat ion of the abnormal change of wave height induced by excavated waterwa y. Numerical results demonstrate that the abnormal change of wave heig ht is due to the adding of the reflected wave height induced by excava ted waterway to the incident wave height. Because the angle between th e incident wave and the axis of the waterway is smaller than the criti cal angle, the reflected wave produced by the waterway may propagate t o the breakwater and may be added with the incident wave, then the abn ormal change of wave height before the breakwater may be caused. So th e wave reflection caused by the change of water depth cannot be neglec ted.