Dynamic compensation operating rule of parallel reservoirs to enhance sufficient hydrological and reservoir capacity compensation

Abstract

In the joint operation of parallel reservoir systems, it is possible to effectively coordinate and compensate for water supply among reservoirs by utilizing hydrological characteristics, reservoir regulation capabilities, and geographical differences. However, the rules for joint operations of parallel reservoir systems are complex when the multiple reservoirs supply water to one user with multiple demands (such as the agricultural and ecological demand). The object of this study is proposing a set of compensation operating rules to address the above issues. The set of rules include the reservoir sequential compensation operating rule, the partial compensation operating rule, and the dynamic compensation operating rule. The rules are extracted with a case study of the parallel reservoir system of the Hotan River Basin (HRB), China. The parallel reservoir system of HRB include two large-scale reservoirs and sixteen small-scale reservoirs. The results indicate that all three type rules could realize the hydrological and reservoir capacity compensation of the parallel reservoir system. The reliability of joint water supplies reaches 100%, while the reliability of individual water supplies is 50%, 54%, and 64%, respectively under the above three operation rules. Considering the characteristics of runoff and the reservoir, the reservoir dynamic compensation operating rule allocate the water resources with the joint water demand of each user in each period. And the dynamic compensation operating rule improves the reliability of water supply. This indicates that the rule successfully addresses the water demand for various users, bridging the gap between supply capacity and joint demand. It is suitable for extreme hydrological conditions and widely applicable.