葛洲坝下游宜昌-杨家脑河段平面二维水沙数学模型

采用有限体积法,基于曲线网格,建立了葛洲坝枢纽下游宜昌-杨家脑河段平面二维水沙数学模型。利用三峡工程蓄水前后2002-2004年河段实测水沙资料对数学模型进行了验证,预测了三峡工程运用2005-2014年本河段河床冲淤变化趋势,分析了河道冲刷后宜昌站枯水位、芦家河浅滩枯水比降等可能的变化趋势,模型成果可为河段治理对策及措施提供科学依据。

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.