Numerical Modeling Of Wave-current Interaction In East China Sea

A coupled wave-current model system is build up base on the Princeton Ocean Model (POM) and Simulating Waves Nearshore(SWAN), by modifying the calculation of surface wind stress, bottom stress and wave-induced radiation stress in POM, and exchanging data between POM and SWAN.In this study, several numerical experiments in Bohai Yello and East China Sea during August 1994 are performed for 199414 & 199415 typhoon cases. The results indicated that,(1) In the high wind speed area, the Donelan formula gives a higher result than the POM original one, the maximum increment is up to 30%. The area of high Cd is much larger.(2) The bottom stress coefficients calculated by Signell formula vary with time largely in the area shallower than 50m.(3) The difference of water elevation caused by considering all of the three stresses has a similar space pattern with the difference of water elevation which just considering any two of the three stresses.(4) Comparison between observation and numerical results indicate that the water elevation of Keelung and Kanmen are closer to the observation when the three stresses are full coupled.(5) The current plays an important role on the calculation of significant wave height. In yellow and bohai seas the tidal current add a 0.2m height to the peak values, in the northeast area of Taiwan, the Kuroshio Current could give a maximum 1.8m addition height to the peak value.These results can guide the prediction of wave and storm surge.