ABSTRACT

Zheng, C.W.; Liang, F.; Yao, J.L.; Dai, J.C.; Gao, Z.S.; Hou, T.T., and Xiao, Z.N., 2020. Seasonal extreme wind speed and gust wind speed: A case study of the China seas. In: Zheng, C.W.; Wang, Q.; Zhan, C., and Yang, S.B. (eds.), Air-Sea Interaction and Coastal Environments of the Maritime and Polar Silk Roads. Journal of Coastal Research, Special Issue No. 99, pp. 435-438.

Previous researches have made great contribution to the evaluation of annual extreme wind speed and annual gust wind speed. However, the research on the extreme wind speed and gust wind speed of different season is extremely scarce, which is urgently needed in disaster prevention and reduction, navigation, ocean exploitation, etc. This study calculates the extreme wind speed with return period of 50-yr (U50) and 100-yr (U100) in each season and annual value by using the ERA-interim gust data and the Gumbel curve method, and the China seas were taken as case studies. The results show that, (1) Both the annual U50 and U100 have a good consistency with the multi-year average maximum gust as a whole, with the large area mainly located in the mid-low latitude (15°∼30°N) and the large center is located in the broad ocean surrounding the Volcano Islands (35-55 m/s in maximum gust, 50-75 m/s in U50 and U100). (2) The maximum gust, U50 and U100 exhibit noticeable seasonal difference. The large areas in January are located in the mid-high latitude, about north of 20°N, including the Japan Sea, south waters of Japan, Ryukyu Islands. The large areas in April are located in the mid-high latitude (north of 25°N) and the south of Volcano Islands, while in the broad ocean between 15°N and 30°N in both July and October.

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