tailieunhanh - Tính toán và kiểm nghiệm trường sóng trong bão bằng số liệu sóng vệ tinh cho khu vực Biển Đông

Nghiên cứu này đi sâu nghiên cứu đánh giá khả năng dự báo sóng trong bão của mô hình WAVEWATCH III cho 3 cơn bão mạnh đến rất mạnh hoạt động trên khu vực Biển Đông: Bão Damrey (2005), bão Ketsana (2009) và bão Haiyan (2013). Độ cao sóng tính toán sau đó được kiểm nghiệm với số liệu vệ tinh hoạt động trong thời gian của từng cơn bão và thể hiện qua 3 chỉ số: BIAS, RMSE và hệ số tương quan. | Vietnam Journal of Marine Science and Technology Vol. 21 No. 2 2021 107 120 DOI https 1859-3097 16408 http jmst Numerical modeling and validating waves generated by typhoons in the East Vietnam Sea using satellite data Pham Tien Dat1 Nguyen Minh Huan1 Nguyen Phuong Anh2 1 Faculty of Meteorology Hydrology and Oceanography VNU University of Science Hanoi Vietnam 2 National Centre for Hydro-Meteorological Forecasting Hanoi Vietnam E-mail datpt@ Received 1 June 2020 Accepted 24 December 2020 2021 Vietnam Academy of Science and Technology VAST Abstract Calculating waves generated by typhoons is one of the most important tasks for wave forecasting at a stormy region like the East Vietnam Sea. It is however difficult to access the accuracy of calculated wave heights due to the lack of observed data. An approach of combining numerical models and satellite data has been widely used. In this study we used the WAVEWATCH III model to stimulate wave fields caused by three strong typhoons Damrey 2005 Ketsana 2009 and Haiyan 2013 then compared significant wave heights with the merged satellite observations. The results show that the BIAS values are small and negative indicating that the wave heights from the model are lower than those from satellites in all cases. In contrast the RMSE values of the three cases are considerably different but are still below 1 m. Finally the average correlation coefficient is highest in typhoon Damrey r whereas in typhoon Ketsana and Haiyan r and r respectively. In conclusion the study suggests that the WAVEWATCH III model has good performance for typhoon wave calculations and can be useful for wave forecasting in the East Vietnam Sea. Keywords East Vietnam Sea typhoon waves. Citation Pham Tien Dat Nguyen Minh Huan Nguyen Phuong Anh 2021. Numerical modeling and validating waves generated by typhoons in the East Vietnam Sea using satellite data. Vietnam Journal of Marine Science and