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Article

Assessing the Influence of Compounding Factors to the Water Level Variation of Erhai Lake

by 1, 1,2,*, 1, 3 and 1
1
Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, College of Water Sciences, Beijing Normal University, Beijing 100875, China
2
Technology Research Center of Water Science, Beijing Normal University at Zhuhai, Zhuhai 519087, China
3
Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
*
Author to whom correspondence should be addressed.
Water 2021, 13(1), 29; https://doi.org/10.3390/w13010029
Received: 18 November 2020 / Revised: 19 December 2020 / Accepted: 23 December 2020 / Published: 26 December 2020
(This article belongs to the Special Issue Climate Change Impact and Adaptation in Water Resources Management)
Climate change and human activities cause lake water level (WL) fluctuations to exceed natural thresholds, with implications for the available water resources. Studies that explore WL change trends and the main driving forces that affect water level changes are essential for future lake water resource planning. This study uses the Mann–Kendall trend test method to explore the WL fluctuations trend and WL mutation in Erhai Lake (EL) during 1990–2019 and explore the main driving factors affecting water level changes, such as characteristic WL adjustments. We also use the principal component analysis to quantify the contribution of compound influencing factors to the water level change in different periods. The results showed that the WL rose at a rate of 47 mm/a during 1990–2019 but was influenced by the characteristic WL adjustment of EL in 2004 and the WL mutation in 2005. In 1990–2004, the WL showed a downtrend caused by the increase in water resource development and utilization intensity, and in 2005–2019, the WL showed an uptrend caused by the combined decrease in evaporation, outflow, and the increase in water supply for water conservancy projects. Additionally, the largest contributions of outflow to WL change were 19.34% and 21.61% in 1990–2019 and 1990–2004, respectively, while the largest contribution of cultivated area to WL change was 20.48% in 2005–2019, and it is worth noting that the largest contribution of climate change to WL change was 40.35% in 2013–2019. In the future, under the increase in outflow and evaporation and the interception of inflow, the WL will decline (Hurst exponent = 0.048). Therefore, planning for the protection and management of lakes should consider the impact of human activities, while also paying attention to the influence of climate change. View Full-Text
Keywords: water level; climate change; human activity; Erhai Lake; influence factor water level; climate change; human activity; Erhai Lake; influence factor
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MDPI and ACS Style

Wu, H.; Wang, S.; Wu, T.; Yao, B.; Ni, Z. Assessing the Influence of Compounding Factors to the Water Level Variation of Erhai Lake. Water 2021, 13, 29. https://doi.org/10.3390/w13010029

AMA Style

Wu H, Wang S, Wu T, Yao B, Ni Z. Assessing the Influence of Compounding Factors to the Water Level Variation of Erhai Lake. Water. 2021; 13(1):29. https://doi.org/10.3390/w13010029

Chicago/Turabian Style

Wu, Huaxin; Wang, Shengrui; Wu, Tao; Yao, Bo; Ni, Zhaokui. 2021. "Assessing the Influence of Compounding Factors to the Water Level Variation of Erhai Lake" Water 13, no. 1: 29. https://doi.org/10.3390/w13010029

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