GEOGRAPHICAL RESEARCH ›› 2013, Vol. 32 ›› Issue (11): 2021-2030.doi: 10.11821/dlyj201311005

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Water environmental quality properties of Dongting Lake affected by construction of the Three Gorges Project

LI Zhongwu1,2, ZHAO Xinna1,2, XIE Gengxin3, YUAN Min1,2, JIANG Yansong1,2   

  1. 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
    2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China;
    3. College of Resource and Environmental Science of Chongqing University, Chongqing 400044, China
  • Received:2013-03-06 Revised:2013-07-15 Online:2013-11-10 Published:2013-11-10

Abstract: The water environmental quality of Dongting Lake has been directly or indirectly influenced by the construction and operation of the Three Gorges Project. In the study, the water pollution indexes were selected by using the principal component analysis. Then the paper evaluated the water quality of Dongting Lake based on overweight comprehensive water quality identification index method, and analyzed the water environmental quality variation after the impounding of the Three Gorges Reservoir. TN and TP were found to be the main pollution indexes through the principal component analysis. The comprehensive water quality identification index of the typical sections indicated that the construction and operation of the Three Gorges Project produced negative effects on the water environmental quality of Dongting Lake for the index was higher than that before the construction. Before 2003, the water quality identification index mainly belonged to class Ⅲ, while after 2003, it mainly belonged to class IV. Temporal and spatial analysis of water environmental quality under the support of ArcGIS showed that there was an obvious change in water environmental pollution distribution after the operation of the Three Gorges Project: some local pollution area transferred to other places, and east Dongting Lake and outlet of the lake were the most polluted areas.

Key words: Three Gorges Project, principal component analysis, water quality identification index method, Dongting Lake