The sedimentation issues near high-pile wharves are critical in port construction and maintenance.The group-piles beneath the wharf affect the surrounding tidal currents and sediment suspension,leading to sediment accumulation.Detailed modeling of pile foundations requires stringent grid scales and is not suitable for large-scale simulations involving numerous pile groups.This study employs a pile group generalization method to improve the FVCOM three-dimensional water-sediment model and validate it against sedimentation data at the Tianjin Port berth piles.Based on this,simulations considering and not considering pile group are conducted to analyze tidal currents,suspended sediment,and erosion-deposition evolution near the Tianjin Port berth.The simulation results show that the improved three-dimensional water-sediment model has good verification results.Considering effects of pile group creates a distinct flow obstruction zone under the wharf,affecting the distribution and velocity of surrounding flow.During flood tide,the sediment concentration in front of and below the dock is twice that of scenarios without pile group,while sediment concentration slightly decreases during ebb tide,with sediment mainly accumulating in front of the wharf.