RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (11): 1843-1849.doi: 10.11870/cjlyzyyhj201511006

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CHANGES OF WATER ENVIRONMENT IN DONGTING LAKE AND ITS IMPACT ANALYSIS AFTER THE THREE GORGES PROJECT OPERATION

WANG Qi1, OU Fu-ping2, ZHANG Lei3, LU Shao-yong3   

  1. 1. Yueyang Environmental Monitoring Center, Yueyang 414000, China;
    2. Ecological and Environmental Monitoring Center of Dongting Lake of Hunan, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu (SEPSORSLD, Yueyang 414000, China;
    3. State Environmental Protection Key Laboratory for Lake Pollution Control, State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • Received:2015-02-13 Revised:2015-03-19 Online:2015-11-20

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Abstract: Taking the upstream rivers, lake body and outlet as the study area, temporal and spatial variations of hydrology, water quality and trophic level in Dongting Lake were analyzed by using ngle factor assessment of water quality and trophic state index(∑TLI),which could be investigated changes of water environment in Dongting Lake and its impact analysis after the Three Gorges project operation based on monitoring data for more than 20 years. The results showed that runoff and sediment into Dongting Lake were decreased significantly. Temporal and spatial characteristics of transparency(SD), total nitrogen(TN), total phosphorus(TP) and photoplankton densitywere obvious. Annual average of four environmental parameters showed increasing trend generally, and changes of SD and density and species of photoplankton were more obvious after the Three Gorges project operation. SD in west Dongting Lake was higher than that in south Dongtinglake, and SD in east Dongting lake was lowest. TP concentration was highest in lake body, while TN concentration was lowest in lake body. Water quality in upstream rivers was better than that in lake body, and it was worst in lake outlet. Water quality in upstream rivers was good and maintained class Ⅱ～Ⅲ, however, water quality in lake body and outlet deteriorated obviously and kept in class Ⅳ～Ⅴ mainly after the Three Gorges project operation. Lake eutrophication was increasingly serious. The trophic level in East Dongting Lake was slightly higher than that in West and South Dongting Lake. After the Three Gorges project operation, runoff and sediment declined, SD increased, water change cycle extended, water environmental capacity decreased, pollutants (nitrogen and phosphorus) concentration increased, above factors had some adverse effects on water quality and increased the degree of lake eutrophication.

Key words: Dongting Lake, Three Gorges project, water quality, eutrophication, impact analysis

CLC Number: 

  • X524
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