关键词: 水环境承载力, 评价指标体系, 组合赋权法, 湘江长沙综合枢纽

Abstract: The reservoir area of Xiangjiang changsha hydro-complex reservoir was selected as the research area, 25 indicators from the social economy, water supply, water resource utilization and regulation aspects were selected to construct an evaluation index system to evaluate the water environment carrying capacity. The results showed that:(1) From 2006 to 2015, the carrying capacity of water environment increased from 0.267 to 0.394, and the overall trend was upward.(2)The carrying capacity of water environment of each subsystem varies greatly. The carrying capacity index of social economic system, water resource utilization system and the water resources regulation subsystem showed steady growth trends, which improved the overall carrying capacity of water environment in the reservoir area. But the water resources supply subsystem showed a fluctuation trend.(3) After the operation of the hydro-complex, the carrying capacity of water environment in Changsha, Zhuzhou and Xiangtan sections increased. In 2015, the carrying capacity of water environment of all the sections reached a common level.(4) The main factors affecting the carrying capacity of the water environment in the reservoir area were the operation of Xiangjiang Changsha Hydro-complex, the social and economic level development, the utilization efficiency of water resources and the total amount of pollutant emissions.

Key words: carrying capacity of water environment, evaluation index system, combination weighting method, Xiangjiang Changsha Hydro-complex;