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金沙江下游分布有在建和已建四大梯级水库,其入、出库水沙特征不仅会影响梯级水库自身的运行,也会极大程度地改变下游三峡水库入库水沙条件。以金沙江下游干支流主要控制站水文、泥沙资料分析为基础,揭示了金沙江下游水沙变化特征及其影响。研究结果表明,金沙江下游水沙异源,中游及干流梯级相继建成运用后,下游沙量大幅度减少,对梯级水库库区及坝下游泥沙冲淤、三峡入库沙量影响显著。
There are four cascaded reservoirs under construction and built in the lower reaches of the Jinsha River. The characteristics of water flow and sediment entering and leaving the reservoir not only affect the operation of the cascade reservoirs, but also greatly change the water and sediment inflow conditions of the downstream Three Gorges Reservoir. Based on the analysis of hydrological and sediment data of main control stations in the lower reaches of the Jinsha River, the characteristics of water and sediment changes in the lower reaches of the Jinsha River and their impacts are revealed. The results show that the sediment volume in the lower reaches of the Jinsha River has been greatly reduced after it is built in succession after the runoff and sediment of the middle reaches and the middle reaches of the Jinsha River have been successively used.