The Hongwan fishing port project is located at the estuary of the Zhujiang River. Due to the influence of water and sand carried by runoff and tidal power of the open sea

the hydrodynamic conditions at this location are very complicated. Based on the theory of fluid dynamics and hydrogeological data for many years

the flow field and sedimentation after the implementation of the Hongwan fishing port construction plan are numerically simulated in this research; an optimization plan based on the simulation results is proposed. Results show that after implementing the construction plan

the flow rate and flow direction of the channel are less affected and the average back sedimentation rate is relatively large. The site of maximum sedimentation is near the harbor entrance and had a thickness of 0.92 m. This feature can be further optimized through large-scale excavation of the entrance or by constructing an artificial masonry dam.