APPLICATION OF ANGULAR SPECTRUM MODEL TO SIMULATION OF IRREGULAR WAVE-PROPAGATION

For the past several years, great advances have been made in the model ing of water-wave propagation problems using the concept of angular sp ectrum. In a 1989 paper, Vincent and Briggs reported hydraulic model e xperiments for the transformation of monochromatic and directionally s pread irregular waves passing over an elliptic shoal resting on a flat bottom, showing that the degree of wave focusing behind the shoal of directional irregular waves is quite different from that of monochroma tic waves. In the present paper, the angular spectrum model developed for the transformation of directional irregular waves by Suh in 1989 i s used to numerically simulate the experimental results of Vincent and Briggs for irregular waves. The comparison between experimental and c omputational results shows that the angular spectrum model is capable of simulating reasonably well the transformation of directional irregu lar waves on irregular bathymetry.