The sedimentation rate in an alongshore trestle wharf speeded up after the reconstruction,so a two-dimensional mathematical model was applied to study the current and sediment transport,and the simulated results of current and suspended sediment were verified by measured data on site.The tidal current of Jintang channel is mainly reciprocating flow and the sediment is from the outer waters instead of the coast.Possible causes include the geographic location and terrain,the arrangement and direction of berth,the mooring of ships,the discharge of an adjacent power plant,wharf pile foundation and dredging,etc.we also analyze the influences of berth deposition on conditions including whether ships dock or not,the adjacent power plant discharges or not,wharf pile foundation exists or not and the water depth of adjacent power plant’s water intake area.It is concluded that the main cause is the unreasonable design and construction of the wharf.