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金沙江的雅砻江汇口至屏山的干流区间是金沙江的主要产沙区,规划有乌东德、白鹤滩、溪洛渡和向家坝等四个重要的水利枢纽。开展金沙江下游推移质沙量研究,对解决金沙江梯级水电站出口推移质沙量不明确的问题,完善泥沙本底资料、延长水库寿命、提高发电效益以及降低机组磨损等都具有现实意义。通过对金沙江下游梯级水电站出口推移质沙量的模型试验研究,探讨了推移质输沙规律,建立了推移质输沙率和水沙因子的关系,确定了天然条件下金沙江下游梯级水电站出口推移质输沙量多年平均为104.6万t。
The main flow producing area of the Jinsha River is Yalong River from the mouth of the Jialisha River to the main stream of Ping Shan. There are four important water control hubs planned for Wudong, Baihetan, Xiluodu and Xiangjiaba. Carrying out the research on sediment transport in the lower reaches of the Jinsha River is of practical significance to solve the problem of sediment discharge volume at the exit of the Jinsha River Cascaded Hydropower Station, improve sediment background information, extend reservoir life, improve power generation efficiency and reduce unit wear. Based on the model test of sediment discharge at the downstream of the Jinsha River cascade hydropower station, the law of sediment transport along the transgressive bedrock was discussed. The relationship between the transgressive sediment transport rate and water and sediment was established. The natural conditions of the downstream cascade hydropower station exit The average annual sediment transport volume was 1,046,000 t.