Abstract: The water intake of Oujiang River Diversion Project is located in the tidal reach of Oujiang River, which is significantly influenced by tidal currents and features complex flow conditions.The local scour and deposition patterns around the intake and within the project reach under engineering conditions remain unclear.Based on historical cross-sectional data, this study analyzed the erosion-deposition trends in the tidal reach of Oujiang River.A two-dimensional flow sediment model was employed to simulate the scour and deposition near the intake and along the project reach after the construction of the diversion project.The results indicated that after project completion, localized scour occurred in the frontal area of the intake due to the diversion effect, with a maximum scour depth of approximately 2 m.Meanwhile, deposition was observed both upstream and downstream of the concrete retaining wall of the project.The deposition extent and magnitude downstream of the intake were greater than those upstream, with a maximum deposition thickness of about 2.5 m.After the project operation, the convex bank slope where the intake head is located may experience further deposition.Enhanced monitoring is therefore recommended, and dredging measures should be implemented when necessary to maintain the project′s functionality.