In order to understand the variations of tidal current caused by the construction of the trestle in ChanLiu Oil and Gas Dock of Haikou city

a two dimensional current mathematical model is set up and the spilt operators method is adopted in solving the model.The numerical algorithm and the compute procedure developed in this paper

in which 20 different corner points and 8 different borders are included

are generally applicable.The effect of the trestle piers on the current is simulated by increasing the sea bed roughness in the pier site.The simulated and calculated results are satisfactory

and provide references for the construction of the dock.