Quantitative Attribution of the Surface Area Reduction of Poyang Lake over the Last Two Decades
Publication: Journal of Water Resources Planning and Management
Volume 150, Issue 11
Abstract
The surface area of Poyang Lake, the largest freshwater lake in China, has decreased substantially in recent decades due to multiple potential factors, including the change in inflow into the lake, flow rate regulation of the Three Gorges Reservoir (TGR), shifts in the Yangtze River stage-discharge relationship, and sand mining in the lake. Here, the daily surface area of Poyang Lake is estimated using Landsat image data and water-level measurements. Multiple regression models are then used to establish the relationship between the surface area and the predictor variables of inflow into the lake, Yangtze River water level, and cumulative sand mining. The contributions of each driving factor to the reduction of Poyang Lake’s surface area are quantified by scenario comparison method. The results reveal that the mean annual surface area of Poyang Lake decreased by (approximately 15% of the total surface area), from in 1980–2002 to in 2003–2016. In terms of overall contribution, sand mining is identified as the most important factor in the surface area reduction, followed by the shift in the Yangtze River stage-discharge relationship and the TGR flow rate regulation. In terms of monthly scale impacts, sand mining reduced the surface area by more than each month. The shift in the Yangtze River stage-discharge relationship reduced the surface area by during the dry season (November–May) of the Yangtze River and increased the surface area by during the flood season (June–October). The TGR flow rate regulation has the opposite effects: it reduced the surface area by during the impoundment period from September to October and increased it by during the release period from December to June.
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Data Availability Statement
All data, models, and code supporting the findings of this study are available from the corresponding author upon request.
Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (NSFC Grant No. 51809243), the Key Science and Technology Project of Jiangxi Province (20213AAG01012), and the Open Research Fund of Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Jiangxi Academy of Water Science and Engineering (2020GPSYS06), all of which are greatly appreciated. Furthermore, we would like to thank Editage (www.editage.cn) for English language editing.
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Journal of Water Resources Planning and Management
Volume 150 • Issue 11 • November 2024
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© 2024 American Society of Civil Engineers.
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Received: Aug 9, 2023
Accepted: Jun 7, 2024
Published online: Aug 29, 2024
Published in print: Nov 1, 2024
Discussion open until: Jan 29, 2025
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