2D horizontal modeling for the movement of flow and sediment from Yichang to Yangjianao reach at the Gezhouba downstream

In this paper,a model based on the generalized curvilinear coordinate is presented to simulate 2D horizontal flow and sediment from Yichang to Yangjianao reach at the downstream of Gezhouba hydropower station. The governing equations of the model are discretized by the finite volume method. The data of flow and sediment from 2002 to 2004 are adopted to verify the accuracy of the model. The change trend in the deposition and erosion for this reach from 2005 to 2014 is forcasted after the running of the Three Gorges Project. There is the possible change trend in water level at Yichang station and the important shallow reach slope after scouring of Yichang hydropower station in the downstream. Thus the prediction results can provide scientific basis for the research of the river regulation countermeasure and measures.