三峡水库对长江中游牯牛沙水道的影响分析及航道整治研究

以长江中游典型放宽型浅滩碍航水道—牯牛沙水道为背景,根据实测资料分析了三峡水库对牯牛沙水道水文泥沙特性的影响,研究了牯牛沙边滩宽度及面积与汛后退水期天数的关系。在深入分析牯牛沙水道碍航特性的基础上制定了航道整治方案,采用二维水沙数学模型对牯牛沙水道治理前后的汛后蓄水冲刷过程进行了模拟,分析了整体方案实施后的工程效果。

Analysis on impact from Three Gorges Reservoir on Guniusha Waterway in Mid-Yangtze River and regulation of its navigation channel

By taking Guniusha Waterway in the Mid-Yangtze River，i.e. a typical broadened shoal navigation-obstruction waterway，as the study background，the impact from the Three Gorges reservoir on the hydrological and sediment characteristics of Guniusha Waterway is analyzed herein in accordance with the relevant measured data，while the relationship between the width and area of Guniusha Side Shoal and the recession days after the flood season is studied. On the basis of the deep analysis made on the navigation-obstruction characteristics of the waterway，the scheme of the navigation channel regulation is established，for which the impounding erosion processes after flood season before and after the regulation of the waterway are simulated with the 2-D flow-sediment mathematical model，and then the engineering effect after the implementation of the whole scheme is analyzed as well.