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Article

Hydrochemical and Stable Isotope Characteristics of Lake Water and Groundwater in the Beiluhe Basin, Qinghai–Tibet Plateau

by 1,2, 1,2,*, 1,2, 1,2 and 3
1
School of Water and Environment, Chang’an University, Xi’an 710054, Shaanxi, China
2
Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, Shaanxi, China
3
Shaanxi Institute of Engineering Prospecting Co. Ltd. (SIEP), Xi’an 710068, Shaanxi, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(8), 2269; https://doi.org/10.3390/w12082269
Received: 14 July 2020 / Revised: 9 August 2020 / Accepted: 10 August 2020 / Published: 12 August 2020
(This article belongs to the Special Issue Geochemistry of Groundwater)
Thermokarst lakes are a ubiquitous landscape feature that impact the thermal state, hydrological process, ecological environment, and engineering stability of the permafrost. This study established the hydrochemistry and stable isotope (δ18O and δD) variations of lake water and groundwater in a typical basin located in the central Qinghai–Tibet Plateau (QTP) of China. The results showed that most water samples could be classified as slightly alkaline, with high levels of salinity and hardness, while the dominant water types were HCO3-CO3 and Cl types. Natural hydrochemical processes, such as mineral dissolution, cation exchange, and groundwater evaporation, had strong impacts on the groundwater chemistry in this region. Dissolution of halite and carbonate minerals causes the major reactions controlling water chemistry in this basin. Additionally, the calculation of the saturation index (SI) values suggested that aragonite, calcite, and dolomite are saturated, while halite is not. Based on the analysis of the stable isotope characteristics, atmospheric precipitation, groundwater, and meltwater from the permafrost are the major sources of thermokarst lakes. Moreover, the evaporation-to-inflow ratio (E/I) indicated that all of the lakes continuously expanded and rapidly developed. Overall, groundwater is an crucial source of lake recharge and its hydrochemical characteristics also have a certain impact on lake water quality. View Full-Text
Keywords: groundwater; thermokarst lake; hydrochemical characteristics; stable isotopic; Qinghai–Tibet Plateau groundwater; thermokarst lake; hydrochemical characteristics; stable isotopic; Qinghai–Tibet Plateau
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MDPI and ACS Style

Li, J.; Wang, W.; Wang, D.; Li, J.; Dong, J. Hydrochemical and Stable Isotope Characteristics of Lake Water and Groundwater in the Beiluhe Basin, Qinghai–Tibet Plateau. Water 2020, 12, 2269. https://doi.org/10.3390/w12082269

AMA Style

Li J, Wang W, Wang D, Li J, Dong J. Hydrochemical and Stable Isotope Characteristics of Lake Water and Groundwater in the Beiluhe Basin, Qinghai–Tibet Plateau. Water. 2020; 12(8):2269. https://doi.org/10.3390/w12082269

Chicago/Turabian Style

Li, Jinlong; Wang, Wei; Wang, Dahao; Li, Jiaqi; Dong, Jie. 2020. "Hydrochemical and Stable Isotope Characteristics of Lake Water and Groundwater in the Beiluhe Basin, Qinghai–Tibet Plateau" Water 12, no. 8: 2269. https://doi.org/10.3390/w12082269

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