Analysis of the characteristics of disastrous strong winds in Xiangshan Port based on measured data

ZHENG Jian; ZHANG Shengning; YANG Yiman; DENG Qi

doi:10.13984/j.cnki.cn37-1141.2025.05.013

Abstract：This study conducts an analysis of the measured wind direction and speed data collected from automatic weather stations in the Xiangshan Port area,spanning 2011 to 2020.The aim is to under-stand the characteristics of disastrous strong winds across different port areas,with a particular focus on the triggering weather systems,the impact intensity,and the duration of each strong wind event.The analysis incorporated surface and upper-air weather maps.The results suggested that:(1)The in-ner and outer regions of Xiangshan Port witnessed an annual average of 105.5 hours and 330.0 hours of strong winds,respectively.June and August recorded the least and most occurrences of strong winds,respectively.On a daily basis,strong winds were most probable in the inner port during the afternoon and in the outer port around the evening.(2)The prevailing wind directions for strong winds in both the inner and outer ports were between WNW and NNW.The terrain affected the inner port,with a secondary prevailing wind direction being NE-E.The outer port,frequently influenced by the edge of the subtropical high,exhibited S-SSW as its secondary prevailing wind direction.(3)The average du-ration of strong wind processed resulting from strong convection,high-pressure edge,low-pressure(vortex)inverted trough,cold air,and typhoon in Xiangshan Port sequentially increases.The weather systems most likely triggering strong winds in the outer and inner ports were low-pressure(vortex),inverted troughs and cold air,respectively.(4)Depending on the influencing weather systems,the wind strength typically exhibited a pattern:outer port surpassing the inner port,which in turn sur-passed the surrounding land.The average duration of strong wind events in the outer port could be 2-4 times longer than in the inner port.Nevertheless,in terms of the intensity and frequency of strong con-vection winds,the inner port significantly surpassed the outer port and surrounding land.