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三峡工程蓄水运用后,随着蓄水位的逐步抬高,库区水深增加,对航道尺度、航行条件起到直接的改善作用。然而,水沙条件和边界条件的重大变化也将使大坝上游河段的水流条件、冲淤特性及河床演变规律发生变化,并可能使部分滩险的航道条件趋于恶化,或造成新的碍航滩险。文章利用三峡工程蓄水后2003～2008年航道原型观测资料,在对坝上河段的水沙条件变化总结认识的基础上,重点分析了三峡工程蓄水后坝上河段航道条件变化特点。
After the Three Gorges Project has been used for water storage, as water level gradually increases, the water depth in the reservoir area will increase, which will directly improve the navigation standard and navigation conditions. However, major changes in water and sediment conditions and boundary conditions will also cause changes in water flow conditions, scouring and silting characteristics and riverbed evolution in the upper reaches of the dam, and may worsen the navigation conditions of some beach sands or cause new Ban navigation beach insurance. Based on the observation data of the waterway from 2003 to 2008 after the Three Gorges Project was impounded, based on the summary of the changes of water and sediment conditions in the dam upstream section, the change characteristics of the channel conditions in the Shangshang reach after the Three Gorges Project was impounded were analyzed.