Based on the morphology of the Luoshan-Hankou reach in the middle Yangtze River, the one dimensional (1-D), unsteady flow and sediment transport model was applied to study the river channel equilibrium profile. Meanwhile, a simple theoretical model relating the equilibrium profile and the incoming flow and sediment from the upper reach was developed. The numerical simulation results of the 1-D model were compared with the corresponding results of the theoretical model with reasonable agreement found between the two models. Finally, the equilibrium slope variations and their effects on flood control in response to the changes in the sediment transport process because of the Three Gorges Reservoir were analyzed using the 1-D model.
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