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Shuanghu Zhang
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, Beijing 100038, China

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Journal article
Published: 22 July 2019 in Water
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Lakes are important for global ecological balance and provide rich biological and social resources. However, lake systems are sensitive to climate change and anthropogenic activities. Poyang Lake is an important wetland in the middle reach of the Yangtze River, China and has a complicated interaction with the Yangtze River. In recent years, the water level of Poyang Lake was altered dramatically, in particular showing a significant downward trend after the operation of the Three Gorges Dam (TGD) in 2003, thus seriously affecting the lake wetland ecosystem. The operation of the TGD changed both the hydrological regime and the deeper channel in the middle reach of the Yangtze River, and affected the river–lake system between the Yangtze River and Poyang Lake. This study analyzed the change in the water level of Poyang Lake and quantified the contributions of the TGD operation, from the perspectives of water storage and erosion of the deeper channel in the middle reach of the Yangtze River, through hydrodynamic model simulation. The erosion of the deeper channel indicated a significant decrease in annual water level. However, due to the water storage of the TGD in September and October, the discharge in the Yangtze River sharply decreased and the water level of Poyang Lake was largely affected. Especially in late September, early October, and mid-October, the contributions of water storage of the TGD to the decline in the water level of Poyang Lake respectively reached 68.85%, 59.04%, and 54.88%, indicating that the water storage of the TGD was the main factor in the decrease in water level. The erosion of the deeper channel accelerated the decline of the water level of Poyang Lake and led to about 10% to 20% of the decline of water level in September and October. Due to the combined operation of the TGD and more reservoirs under construction in the upper TGD, the long-term and irreversible influence of the TGD on Poyang Lake should be further explored in the future.

ACS Style

Dan Wang; Shuanghu Zhang; Guoli Wang; Qiaoqian Han; Guoxian Huang; Hao Wang; Yin Liu; Yanping Zhang. Quantitative Assessment of the Influences of Three Gorges Dam on the Water Level of Poyang Lake, China. Water 2019, 11, 1519 .

AMA Style

Dan Wang, Shuanghu Zhang, Guoli Wang, Qiaoqian Han, Guoxian Huang, Hao Wang, Yin Liu, Yanping Zhang. Quantitative Assessment of the Influences of Three Gorges Dam on the Water Level of Poyang Lake, China. Water. 2019; 11 (7):1519.

Chicago/Turabian Style

Dan Wang; Shuanghu Zhang; Guoli Wang; Qiaoqian Han; Guoxian Huang; Hao Wang; Yin Liu; Yanping Zhang. 2019. "Quantitative Assessment of the Influences of Three Gorges Dam on the Water Level of Poyang Lake, China." Water 11, no. 7: 1519.

Journal article
Published: 21 July 2016 in Water
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The water level of Dongting Lake has changed because of the combined impact of climatic change and anthropogenic activities. A study of the long-term statistical properties of water level variations at Chenglingji station will help with the management of water resources in Dongting Lake. In this case, 54 years of water level data for Dongting Lake were analyzed with the non-parametric Mann–Kendall trend test, Sen’s slope test, and the Pettitt test. The results showed the following: (1) Trends in annual maximum lake water level (WLM), annual mean lake water level (WL), and annual minimum lake water level (WLm) increased from 1961 to 2014; however, the three variables showed different trends from 1981 to 2014; (2) The annual change trends in Dongting Lake between 1961–2014 and 1981–2014 were found to be from approximately 0.90 cm/year to −2.27 cm/year, 1.65 cm/year to −0.79 cm/year, and 4.58 cm/year to 2.56 cm/year for WLM, WL, and WLm, respectively; (3) A greater degree of increase in water level during the dry season (November–April) was found from 2003 to 2014 than from 1981 to 2002, but a smaller degree of increase, even to the point of decreasing, was found during the wet season (May–October); (4) The measured discharge data and numerical modeling results showed the operation of Three Gorge Reservoir (TGR) pushed to influence partly the recent inter-annual variation of water level in Dongting Lake region, especially in the flood and dry seasons. The analysis indicated that the water level of Dongting Lake has changed in the long term with decreasing of range between WLM and WLm, and may decrease the probability of future drought and flood events. These results can provide useful information for the management of Dongting Lake.

ACS Style

Qiaoqian Han; Shuanghu Zhang; Guoxian Huang; Rui Zhang. Analysis of Long-Term Water Level Variation in Dongting Lake, China. Water 2016, 8, 306 .

AMA Style

Qiaoqian Han, Shuanghu Zhang, Guoxian Huang, Rui Zhang. Analysis of Long-Term Water Level Variation in Dongting Lake, China. Water. 2016; 8 (7):306.

Chicago/Turabian Style

Qiaoqian Han; Shuanghu Zhang; Guoxian Huang; Rui Zhang. 2016. "Analysis of Long-Term Water Level Variation in Dongting Lake, China." Water 8, no. 7: 306.