Evolution characters of water exchange abilities between Dongting Lake and Yangtze River |
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| Authors: | Chaomin Ou Jingbao Li Yongqiang Zhou Weiyan Cheng Yan Yang Zhonghua Zhao |
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| Institution: | 1. College of Information System and Management, National University of Defense Technology, Changsha 410073, China2. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China3. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China4. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | By using field-survey hydrological data of the related control stations in Dongting Lake and the Yangtze River mainstream in 1951–2010, the evolution characters of water exchange abilities between the two water bodies and their response to the operation of the Three Gorges Reservoir (TGR) from different time scales are analyzed based on their hydraulic relations. The results are shown as follows. Firstly, during July-September, the replenishment ability of Three Outlets to Dongting Lake is stronger, and in January-March, the replenishment ability of Dongting Lake to Yangtze River is stronger. Secondly, there has been an obvious inter-decadal wave on the water exchange coefficient between Dongting Lake and Yangtze River. In 1951–1958 and 1959–1968, the replenishment ability of Three Outlets to Dongting Lake was stronger, but in 2003–2010, the replenishment ability of Dongting Lake to Yangtze River has been strengthened. Thirdly, the spill-division ability of Three Outlets weakens, and the water of Dongting Lake coming from Three Outlets decreases either in typical years or under different dispatching modes of the TGR after the operation of the Three Gorges Reservoir. Furthermore, the water of Dongting Lake coming from Four Rivers takes the dominant position, which obviously enhances the replenishment ability of Dongting Lake to Yangtze River. Fourthly, if the effect of the runoff fluctuation in the basin is not considered, the evolution characters of the exchange capacities and the exchange process between Dongting Lake and Yangtze River in different time scales are generally changed with the variation of the water exchange amount between them, although the factors influencing the water exchange capacities between them is very complex. These show that there is an in-line growth or decline relation between the river-lake water exchange ability and the river-lake water exchange amount. |
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| Keywords: | water exchange coefficient evolution of water exchange function Dongting Lake Yangtze River |
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