Numerical Simulation of Hazardous Waves in the Korean Peninsula using SWAN

Abstract

In this study, we simulated the hazardous waves induced by typhoons and for the winter season in the Korean Peninsula. The third-generation numerical wave model SWAN(Simulating WAves Nearshore) was used for the simulation. As input forcing of the numerical wave model, the meteorological forecast data of RDAPS and JMA-MSM were used. We analyzed the sensitivity of input forcing data with re-analysis data of ERA5. Also, we constructed the sea surface wind field of tropical cyclones by using JTWC's best track data and Holland model for simulation storm waves induced by typhoons. For further research, we established a nested model for the simulation of storm waves induced by typhoon Maysak and Haishen, which are considered the most severe incidents in the simulation periods. For the source terms of energy generation by wind and white-capping dissipation, we used Komen and ST6 package formula. In the end, we conducted statistical analysis to validate the wave model by comparing its result with observation data of waves from the WINK system. As a result, SWAN with ST6 and RDAPS showed the best performance in the wave height simulation of winter storm waves. On the other hand, using a formula of Komen with the same input forcing showed the better in the wave height simulation of storm waves induced by Typhoons in the Korean Peninsula. But the prediction of a wave period parameter needs further research or approaches to improve the prediction accuracy.