为了给虎跳峡河段梯级开发方案和工程规模的决策提供参考,促进工程早开工、早见效,基于考虑控制性水库调蓄、已建在建跨流域引调水工程和河道外新增耗水量的边界条件,建立了长江上游控制性水库联合调度模型,计算分析了虎跳峡河段梯级不同调节库容方案时水库自身库容的利用情况,以多年平均年发电量和平枯水期发电量指标为代表分析了对下游梯级电站水资源利用效益的补偿作用。通过分析论证认为:结合汛期需要预留58.6 亿m³防洪库容的要求,虎跳峡河段设置60 亿~120 亿 m³调节库容,即可在充分利用本河段水力资源的同时,增加下游梯级电站多年平均年发电量56.2 亿~119.4 亿 kW·h,多年平均平枯水期发电量161.5 亿~294.0 亿 kW·h,继续增加调节库容,虽然对下游梯级电站的补偿效益更为显著,但库容利用率较低,边际效应递减较快。

In order to provide reference for the decision-making of the cascade development plan and engineering scale of the Tiger-Leaping-Gorge reach cascade, and promote the early start and effectiveness of the project, we established the joint operation model of controlled water projects in the upper reaches of the Yangtze River based on boundary conditions considering the regulation and storage of the controlled reservoirs, the existing and constructing transbasin water transfer projects and the additional water consumption outside the river channel. By using the model, we calculated and analyzed the utilization of the reservoir’s own storage capacity of different regulating storage schemes in the Tiger-Leaping-Gorge reach. The water resource utilization benefits of downstream cascade hydropower stations was analyzed using power generation indicators as a representative. Through analysis and demonstrates, it is believed that, to meet the requirement of reserving 5.86 billion m³ of flood control storage capacity during the flood season, the Tiger-Leaping-Gorge reach set with 6 to 12 billion m³ regulating storage can fully utilize the hydraulic resources of this reach and increase the average annual power generation of downstream cascade hydropower stations from 5.62 to 11.94 billion kW·h for many years, and from 16.15 to 29.40 billion kW·h for many years during normal water periods and dry season. Further increasing the regulating storage can have more significant compensation benefits for downstream cascade hydropower stations, but the utilization rate of storage capacity is relatively low, and the marginal effect decreases rapidly.