Applying multivariate statistics for identification of groundwater chemistry and qualities in the Sugan Lake Basin, Northern Qinghai-Tibet Plateau, China Applying multivariate statistics for identification of groundwater chemistry and qualities in the Sugan Lake Basin, Northern Qinghai-Tibet Plateau, China

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Vol17 No.2: 448-463

Title】Applying multivariate statistics for identification of groundwater chemistry and qualities in the Sugan Lake Basin, Northern Qinghai-Tibet Plateau, China

Author】XIANG Juan1; ZHOU Jun-ju1*; YANG Jun-cang3; HUANG Mei-hua1; FENG Wei1; LI Qiao-qiao1; XUE Dong-xiang1; ZHAO Ya-ru1; ZHU Guo-feng1,2*

Addresses】1 College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China; 2 State Key Laboratory of Cryosphere Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; 3 Geological Environmental Monitoring Institute of Gansu Province, Lanzhou 730050, China

Corresponding author】ZHOU Jun-ju; ZHU Guo-feng

Citation】Xiang J, Zhou JJ, Yang JC, et al. (2020) Applying multivariate statistics for identification of groundwater chemistry and qualities in the Sugan Lake Basin, Northern Qinghai-Tibet Plateau, China. Journal of Mountain Science 17(2). https://doi.org/10.1007/s11629-019-5660-z

DOI】https://doi.org/10.1007/s11629-019-5660-z

Abstract】The Sugan Lake Basin is located in the inland arid region of northwestern China, in which groundwater is of great significance to human and ecology. Therefore, it is necessary to understand the chemical characteristics and quality of groundwater in the basin. Based on samples collected from 35 groundwater wells in Sugan Lake Basin, the spatial distribution characteristics of groundwater chemistry, main hydrogeochemical processes and groundwater quality have been discussed in this paper by using the multivariate statistics and hydrochemistry analysis methods. The results showed that the groundwater is weakly alkaline, and its total dissolved solid (TDS) and total hardness (TH) are high, with the average values of 1244.03 mg/L and 492.10 mg/L, respectively. The types of groundwater are mainly HCO₃⁻-SO₄²⁻-Ca²⁺type in the runoff area and Cl⁻-SO₄²⁻-Na⁺type in the catchment area. Rock weathering and ion exchange are the main controlling factors of regional groundwater chemistry, followed by evaporative crystallization, and human activities have less impact on groundwater. The spatial difference of groundwater quality is obvious, the water quality of the catchment area is not suitable for drinking, and the suitability for plant growth is also poor. The groundwater in the runoff area can be used for drinking, but the hardness is slightly higher, which is more suitable for ecological purpose.

Keywords】Hydrochemistry; Groundwater; Water quality assessment; Sugan Lake Basin; Water quality; Tibet