RESEARCH ON HIERARCHICAL FLOOD OPERATION MODE FOR THE THREE GORGES RESERVOIR

摘要

The flood control situation of middle and lower reaches of the Yangtze River has been improved greatly by the Three Gorges Reservoir (TGR) in China, and is further better due to the decreasing upstream water and new reservoirs being built up and running successively. Meanwhile, the downstream flood control demands are enhanced increasingly, which is caused by rapid development of economy and society along the river. With these new circumstances, the original design operation mode of TGR can't satisfy the latest flood control demands. In this paper, a hierarchical flood operation mode combining the reservoir water level and inflow in flood season was proposed based on the analyses of some special water levels and storage outflows of TGR, and multiple schemes were made and calculated. Results indicated that without decreasing the design flood control standard of TGR, the proposed mode can alleviate pressure of lower reaches more reasonably, increase navigation time and use flood resources more effectively. Compared with the original design mode, the annual average hydropower generation during flood season is increased by 8%. Besides, the proposed mode can be operated easily to obtain obvious comprehensive benefits, which may provide a new scientific reference for operation decision-making of TGR in flood season.