Taking the Yangtze Estuary as an example, applicability of the sediment numerical model to prediction of the effect of the reclamation project on accelerating sediment deposition was examined through comparison of the simulated and measured results and reasonableness analysis of predictions. The results show that the plane deposition feature, cross-sectional deposition feature, and deposition amount calculated with the sediment numerical model agree with measurements, indicating that the sediment numerical model is applicable to prediction of the effect of the reclamation project in the Yangtze Estuary on accelerating sediment deposition.