洞庭湖与长江水体交换能力演变及对三峡水库运行的响应

doi:10.11821/xb201301012

Abstract

Abstract: By using the hydrological data of the related control stations in the Dongting Lake region and the Yangtze River mainstream in 1951-2010, this study analyzed the evolution of water exchange ability between Dongting Lake and the Yangtze River and its response to the operation of the Three Gorges Reservoir (TGR) from different time scales based on their hydraulic relationships. The results are shown as follows. Firstly, from July to September, the compensation ability of the Three Outlets into Dongting Lake is stronger, and from January to March, the compensation ability of Dongting Lake into the Yangtze River tends to be stronger. Secondly, there has been an obvious inter-decadal wave on the water exchange coefficient between Dongting Lake and the Yangtze River, namely, in the periods of 1951-1958 and 1959-1968, the compensation ability of the Three Outlets into Dongting Lake tends to be stronger, but in 2003-2010, the compensation ability of Dongting Lake into the Yangtze River are strengthened. Besides, the spill-division ability of the Three Outlets is weakening, and the water of the lake coming from the Three Outlets decreases. As a result, the water of the lake which comes from the Four Rivers in Hunan takes the dominate position, which obviously enhances the compensation ability of Dongting Lake into the Yangtze River in either typical years after the operation of the TGR or under different dispatching modes of the TGR.

Key words: water exchange coefficient, evolutions of water exchange ability, Dongting Lake, Yangtze River

LI Jingbao, ZHOU Yongqiang, OU Chaomin, CHENG Weiyan, YANG Yan, ZHAO Zhonghua. Evolution of water exchange ability between Dongting Lake and Yangtze River and its response to the operation of the Three Gorges Reservoir[J].Acta Geographica Sinica, 2013, 68(1): 108-117.

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Evolution of water exchange ability between Dongting Lake and Yangtze River and its response to the operation of the Three Gorges Reservoir

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