| Abstract: | In order to analyze the evolution characteristics of wind and waves along the Zhejiang coast under the influence of typhoons, using marine buoy stations data in Zhejiang Province and ERA5 reanalysis data, seven typhoon cases that have severely affected Zhejiang since 2010 were selected to analyze the evolution characteristics of sea surface winds and waves along the Zhejiang coast under the influence of typhoons. The results showed that, as typhoons approach, make landfall and move away, the wave pattern of the ocean waves mostly undergoes changes in mixed wave, wind wave and mixed wave. The appearance of surge wave patterns is closely related to the strength of typhoons and their distance and orientation from buoy stations, as well as to ocean tidal phenomena. The changes in wave height along the Zhejiang coast during the impact of typhoons are determined by the combined effects of wind speed and direction. When the wind direction stabilizes, continuous increase in wind speed has a significant effect on the increase of wave height. The change in wind direction can also have an impact on the change in wave height, and the shift in onshore and offshore winds can cause significant changes in wave height. The effective wave height of ERA5 reanalysis data tends to be smaller when typhoon waves are large. After analyzing the corrected ERA5 significant wave height, it was found that the high significant waves of typhoon wave are related to the position of the typhoon center. The research results provide reference for typhoon wave forecasting services that seriously affect the coastal areas of Zhejiang. |
