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Open AccessArticle

Water Compensation and Its Implication of the Three Gorges Reservoir for the River-Lake System in the Middle Yangtze River, China

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College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China
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Department of Civil & Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada
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College of Hydropower & Information Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
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China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China
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Changjiang River Scientific Research Institute, Wuhan 430010, China
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Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China
*
Author to whom correspondence should be addressed.
Water 2018, 10(8), 1011; https://doi.org/10.3390/w10081011
Received: 29 May 2018 / Revised: 17 July 2018 / Accepted: 25 July 2018 / Published: 31 July 2018
(This article belongs to the Section Hydrology)
Dam construction is an important means to improve water use efficiency and the aquatic environment. However, the flow regulation of the Three Gorges Reservoir (TGR) in the middle Yangtze River has attracted much attention because the severe drought occurred in the river-lake system downstream of the TGR. In this paper, the Dongting Lake was selected as a case study in order to detect the possible relationship between the flow regulation of the TGR and the extreme drought in the river-lake system based on a coupled hydrodynamic model. The results not only confirmed the significant role of the TGR to relieve drought in the river-lake system, but also indicated that the outflow of the TGR and the hydraulic gradient between the Zhicheng to Chenglingji stations were the crucial factors to affect the water exchange between the rivers and the Dongting Lake. The adjustment of hydraulic gradient within a proper range during the water compensation of the TGR will be an effective measure to improve the water exchange and water environment in the river-lake system. These findings present the quantitative influence of these important factors on the water exchange between rivers and lakes and provide a scientific reference for environmental and ecological management of other river-lake systems. View Full-Text
Keywords: water compensation; the Three Gorges Reservoir; river-lake system; water exchange water compensation; the Three Gorges Reservoir; river-lake system; water exchange
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Zhang, J.; Feng, L.; Chen, L.; Wang, D.; Dai, M.; Xu, W.; Yan, T. Water Compensation and Its Implication of the Three Gorges Reservoir for the River-Lake System in the Middle Yangtze River, China. Water 2018, 10, 1011.

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