论三峡工程坝区河势与上引航道防淤堤布置

三峡工程坝区河道弯曲，河势变化比较复杂，水库蓄水后期泥沙淤积严重，对通航建筑物上引航道的水流条件带来极为不利的影响，难以保证船舶安全通畅，为此，必须正确处理坝区河民上引航道的关系，选择合适的上引航道布置方案。当前，上游引航道布置有“小包”、“大包”、“全包”三个方案。从保证安全通航，远近结合，有余地，并且可将临时船闸改建的冲沙闸包括在上引航道内，以“全包”方案有利，与此同时，填筑长堤缺口的技术措施

River Morphology and Layout of Guide Dike of Upstream Approach Channel

The Yangtze river meanders with a complex channel morpho1ogy in the Three Gorges Project area. At later stage of the impounding up of the reservoir,the sediment deposition will be increasely serious.It will have a significant adverse influence on the flow conditions in the upstream approach channel and it will be dif ficult to ensure smoothly navigation.The relationship between the morphology of the river channel in the Project area and the layout of the upstream approach chan nel,therefore,should be carefully treated.It will be necessary to arrange additionally flushing sluice and resolve the effect of the water level fluctuation on the shiplift.