根据实测地形和水文泥沙资料，分析了葛洲坝枢纽运用后宜昌河段的河床冲淤变化、推移质和床沙的粗化以及枯水位的变化。由数学模型计算和物理模型试验成果，预测了三峡工程施工期及初期运用阶段葛洲坝枢纽近坝段水位下降及对通航的影响。

The river channel change, the bed load and bed material armoring, and the water level lowering after the operation of the Gezhouba project are analyzed based on the topographic and hydrologic data. The water level lowering and it's impact on navigation in the period of construction and initial stage operation of the Three Gorges project are predicted by use of the results of mathematical and physical model.