Abstract:
This paper utilizes the wind field data at a height of 10 meters provided by the WRF model to drive the third-generation wave model SWAN for wave simulation, and successfully simulates the waves forced by the Typhoon “Amphan”. The simulated wind field and wave field are compared and verified with the observational data from the HY-2B satellite scatterometer data and the Jason-3 satellite altimeter. It shows that the WRF model can well capture the development, evolution, and landfall process of the Typhoon “Amphan”, and provide detailed wind field for the SWAN model to simulate the waves induced by the typhoon in the Bay of Bengal. The result is used to further study the characteristics of the Stokes drift induced by waves during the Typhoon “Amphan” in the Bay of Bengal in 2020. The results show that the typhoon generated intense cyclonic activity and huge waves in the study area, with maximum wind speed reaching 65 m/s, the lowest atmospheric pressure being 940 hPa, and the maximum significant wave height exceeding 16 m. The Stokes drift caused by the typhoon waves exceeded 0.9 m/s, with influence depth surpassing 20 m, and the maximum Stokes transport reaching 7 m
2/s. Furthermore, the spatial distribution of the 10 m wind speed, significant wave height, Stokes drift speed, Stokes influence depth, and Stokes transport during the typhoon period is highly related to the path of the typhoon. The distribution along the path of the typhoon shows a clear transverse asymmetry, with intensity on the right side of the typhoon path being greater than that on the left.