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Open AccessArticle

Water-Exchange Response of Downstream River–Lake System to the Flow Regulation of the Three Gorges Reservoir, China

1
College of Resources and Environmental Science, South-central University for Nationalities, Wuhan 430074, China
2
China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3
College of Hydropower & Information Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
4
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
5
Bureau of hydrology, Changjiang water resources Commission, Wuhan 430010, China
6
Guangzhou Institute of Geography, Guangzhou 510070, China
7
Tianjin Research Institute for Water Transport Engineering, Tianjin 300456, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(11), 2394; https://doi.org/10.3390/w11112394
Received: 3 September 2019 / Revised: 17 October 2019 / Accepted: 11 November 2019 / Published: 15 November 2019
(This article belongs to the Special Issue Addressing the Environmental Impacts of Hydropower)
Hydrological regime changes in the river–lake system and their influences on the ecological environment downstream dams have attracted increasingly more attention all over the world. The Dongting lake downstream of the Three Gorges Dam (TGD) in the Yangtze River has been experiencing a series of hydraulic and hydrological changes over the last decade. The hydrological and ecological influences of the TGD flow regulation on the Dongting river–lake system and its functional mechanism during the impounding periods remain extremely unclear. This study examines the hydrological changes in the Dongting river–lake system based on a 1D/2D coupled hydrodynamic model. In particular, the inflow boundary of the model with and without the TGD was applied with the outflow and inflow of the TGD, respectively, during the same regulation periods. The results show that the diverted flow from the Yangtze River into the Dongting lake and outflow from the lake back to the river drastically decreased during the impounding periods, especially in October. The decreased water exchange between the Yangtze River and the Dongting lake impaired the water residence capacity to some extent in the lake. Stage decrease in the lake area resulted in a significant reduction in the water volume of the Dongting lake with the same time percentage. In addition, the obvious drainage effect in Dongting lake due to the increased stage difference and current speed after the TGD operation was the essential cause of hydrological changes in the lake area. These results provide an improvement in the understanding of impoundment influences on the large river–lake system and give some practical information for ecological environment management in similar river–lake systems. View Full-Text
Keywords: Three Gorges Reservoir; impoundment influences; river–lake system; water exchange Three Gorges Reservoir; impoundment influences; river–lake system; water exchange
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Zhang, J.; Huang, T.; Chen, L.; Liu, X.; Zhu, L.; Feng, L.; Yang, Y. Water-Exchange Response of Downstream River–Lake System to the Flow Regulation of the Three Gorges Reservoir, China. Water 2019, 11, 2394.

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