As a critical national energy transportation channel,the channel of Huanghua Port coal terminal area has long suffered from strong wind-induced sudden siltation and high dredging demands,seriously affecting navigation efficiency and energy transport safety.To enhance the anti-siltation capacity of the waterway and ensure navigation stability,targeting the sand-retaining dike extension in the core of the 70,000 DWT two-way channel phase Ⅱ project,a MIKE21-based two-dimensional horizontal tidal current,wave,and sediment mathematical model is adopted to systematically evaluate the channel silting response of different submerged dike extension schemes under normal and different recurrence periods of strong wind weather.The results show that the overall reduction effect of the submerged embankment extension scheme is significant,with an average reduction rate of 15% for the entire channel,a reduction rate of up to 32% for the area within the current mouth,and a reduction rate of about 17% for the newly added submerged dike section.However,there is a 2%-5% increase in siltation in the open section,and under the action of northeast strong winds with a return period of no less than 15 years,the regional circulation formed by the dike extension projects of Binzhou Port and Huanghua Port will intensify sediment transport near the W15+0-W22+0 new dike head,resulting in a slight increase in local siltation intensity.This study provides a scientific basis for engineering scheme optimization and channel maintenance under extreme weather,and offers a reference for port channel regulation on silty coasts.