Study on the Impounding Process Optimization of Cascade Reservoirs in Upper Changjiang River

Abstract

Overlapping storage periods of the cascade reservoirs would lead to the unreasonable using of the water resources, and each reservoir in the cascade might not be filled, that would influence the comprehensive benefit of the cascade reservoirs. In this paper, the Runoff regulation model of the cascade reservoirs is established and verified, the flood regulating calculation of the Xiluodu-Xiangjiaba-Three Gorges cascade reservoirs is done, and based on the flood regulating calculation, the earliest dates of the starting impounding of the cascade reservoirs are as below: Xiluodu and Xiangjiaba reservoirs are both not earlier than Sep.11, and Three Gorges Reservoir is not earlier than Sep.1. Then by using the comparative analysis and based on an overall analysis of generating electricity and transport of the cascade reservoirs, the most reasonable impounding date are calculated as below: the Xiluodu reservoir starts impounding in Sep.1, the Xiangjiaba reservoir starts impounding in Oct.1, and the Three Gorges Reservoir starts impounding in Sep.1.