Hydrochemical Characteristics and Cause Analysis of Natural Water in the Southeast of Qinghai-Tibet Plateau

Water

Zongjun Gao¹  Hui Tong¹  Fasheng Gao¹  Cong Han¹  Jiutan Liu²  Qiao Su³ 

[1] College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China;Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;

关键词: natural water;    hydrochemical characteristics;    cause analysis;    southeastern Qinghai-Tibet plateau;   

DOI  :  10.3390/w13233345

来源: DOAJ

【 摘 要 】

This study investigated the hydrochemical characteristics and formation mechanism of natural water in the southeastern Qinghai-Tibet Plateau. To this end, 19 groundwater samples were collected, tested, and analyzed using various methods, such as mathematical statistics, a Piper diagram, correlation analysis, Gibbs plots, and an ion ratio analysis. The results show that the dominant anions are HCO₃⁻ and SO₄²⁻, and the dominant cations are Ca²⁺ and Mg²⁺, which accounted for 98.50% and 85.94% of the total amount of anions and cations, respectively. The samples were weakly alkaline water, where the TDS (total dissolved solids) ranged from 28.00 mg/L to 242.00 mg/L, with an average value of 129.10 mg/L. The hydrochemical types were mainly Ca·Mg-HCO₃·SO₄—accounting for 42.10%. The hydrochemical evolution process was found to be mainly controlled by the weathering and dissolution of carbonate and silicate rocks. The main sources of Na⁺ and K⁺ are rock salt and silicate rocks, and those of Ca²⁺, Mg²⁺, HCO₃⁻, and SO₄²⁻ are from the dissolution of dolomite, calcite, gypsum, and other calcium and magnesium bearing minerals. In addition, atmospheric precipitation serves as a replenishment source of natural water in the region, and the recharge is affected by evaporation.

【 授权许可】

Unknown