When the wharf project of Tieshan Port in Beibu Gulf was constructed, nearby mangrove plants were damaged. A coupled model of hydrodynamic force and sedimentation in the gulf including mangrove intertidal zone based on remote sensing enhancement was built. Impacts of the wharf on the tide, sediment transport, erosion and deposition in the mangrove zone were evaluated. Results showed that the model can make full use of the tidal simulation information in the South China Sea and can finely simulate the sediment transport principle nearby the wharf. In association with information fusion technology of remote sensing inversion of the cover probability of global surface water and local tidal levels, elevation data in mangrove zone were reliably obtained. The tides mainly in the southern of the mangrove zone were influenced by the wharf. The velocity decreased at the most rising tide, and that in the tidal channel increased at the most ebb tide. When the way to the wharf was transferred using a steel trestle, the velocity in the southeast of the mangrove zone increased slightly. During the construction period of the wharf, the increase of suspended sediment concentration varied from 20 mg/L to 50 mg/L in the range of 69% and 72% of the mangrove zone. Before the wharf construction, the average sediment deposition in the mangrove zone accounted for 0.27 cm/a. For two designed ways to the wharf, i.e. the road isolating tide and the steel trestle allowing tide passing, the average deposition accounted for 0.45 cm/a and 0.36 cm/a with the range of 96.6% and 89.3% in the mangrove zone respectively. Provided that the steel trestle to the wharf would be selected, the average increment of the deposition in the mangrove zone decreased by 50%. The conclusions can provide the scientific basis for the simulation of tide and sedimentation in intertidal zone and the decision of the mangrove protection.