RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2012, Vol. 21 >> Issue (Z2): 100-.

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ECOLOGICAL WATER DEMAND OF THE DONGTING LAKE BASED ON RIVERLAKE WATER EXCHANGE BALANCE

SHI Xuan1,2,3, XIAO Weihua2,3, YAN Denghua2,3, DUAN Weijuan4, ZHAO Zhixuan2,3,WANG Xu2,3,5, HAO Cailian1,2,3   

  1. (1.Environmental Science and Engineering Department, Donghua University, Shanghai 201620| China;
     2.Water Resources Department, China Institute of Water Resources and Hydropower Research, Beijing 100038| China|3.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038| China|4.Hunan Hydro &|Power Design Institute, Changsha 410007| China; 5.Department of Civil and Environmental Engineering|University of Science and Technology Beijing|Beijing 100083| China)〖
  • Online:2012-12-19

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Abstract:

The Dongting Lake is the second largest fresh water lake in our country,which is important for taking insending out water in the middle and lower reaches of the Yangtze River.The change of underlying surface conditions and the application of water conservancy projects influences the geography and coming water conditions,which consequently causes the great changes of exchange water frequency and exchange water amount.Based on the analysis of  the change of exchange water frequency from 1961 to 2008,in particular contrasting the exchange water amount of the 1990s and that after the Three Gorges Project operation,the change of the exchange characteristic of the Dongting Lake was studied.By calculating,the exchange water of the Dongting Lake reduced 14647 billion,the amount of dry season was 4834 billion and that of flood season was 9814 billion.As a result,the change of exchange characteristic of the Dongting Lake should be seriously noticed in the process of water conservancy projects.

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