金沙江建库对三峡水库泥沙淤积的影响

金沙江上梯级水库的修建必然影响水库淤积发展过程，进而水库的长期运用及影响航运状况。本文运用一维及二维泥沙数学模型计算分析了金沙江建库对三峡水库泥沙淤积及航运的影响，一维计算结果表明，上游建库的综合作用将延缓三峡水库的淤积发展过程，上游建库情况下，变动回水区河段在三峡水库运用前40年内不会出现泥沙淤积问题；重庆河段整体呈现冲的趋势，100年内基本不发生淤积。二维计算结果表明，相对于上游无库情况下，金沙江建库后，重庆河段长江干流泥沙淤积量及淤积厚度明显减少，甚至出现冲刷，航运条件明显改善；金沙碛河段受金沙江建库影响较小，仍会出现碍航问题，需要进一步整治。

The Influence on Deposition of the Three Gorges Reservoir Caused by the Construction of Reservoirs at Jinsha River

The deposition of reservoir is influenced by water silt condition, the construction of reservoirs at Jinsha River will have a greatly influence on deposition and navigation of the Three Gorges Reservoir. Based on one-dimensional sediment mathematical model and two-dimensional sediment mathematical model, the influence on the deposition and navigation caused by the construction of reservoirs at Jinsha River is researched, a conclusion is drawn that, the deposition rate in the Three Gorges Reservoir will decrease with construction of reservoirs at Jinsha River, there is no deposition in the fluctuating backwater area in 40 years. With building of the reservoirs upriver, there is obvious erosion trend in Chongqing reach, the deposition amount and thickness in the area deposited will decrease, and the navigation channel will be improved. The construction of reservoirs at Jinsha River has little influence on Jinshaqi reach, there is still navigation problem in Jinshaqi reach and some measures need to be put in practice.