Journal
WATER
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/w10081011
Keywords
water compensation; the Three Gorges Reservoir; river-lake system; water exchange
Categories
Funding
- National Key R&D Program of China [2017YFC0405900]
- National Natural Science Foundation of China [51509273, 51679094, 51409085]
- National Key Research and Development Plan [2016YFC0400901]
- Open Foundation of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering [2015491111]
- Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research) [IWHR-SKL-201607, 2016TS07]
- Technology Demonstration Projects of Ministry of Water Resources [SF2016-10]
- Research and Development Projects on Application Technology of Heilongjiang Province [GZ16B011]
- Fundamental Research Funds for the Central Universities [2017KFYXJJ194, 2016YXZD048]
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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.
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