Hydrochemical characteristics of surface water in Hengduan mountain region of Eastern Tibet and its response to human activities: A case study of Duoqu Basin, Jinsha River

作者：Jingjie Li, Sheng Lian, Mingguo Wang, Huai-sheng Zhang, Tao Yang · 发表于：China Geology · 年份：2024 · DOI：10.31035/cg2023053 · 被引用次数：5 · 研究领域：Environmental Quality and Pollution

ABSTRACT: The analysis of hydrochemical characteristics and influencing factors of surface river on plateau is helpful to study water hydrological cycle and environmental evolution, which can scientifically guide rational development and utilization of water resources and planning of ecological environment protection. With the expansion and diversification of human activities, the quality of surface rivers will be more directly affected. Therefore, it is of great significance to pay attention to the hydrochemical characteristics of plateau surface rivers and the influence of human activities on their circulation and evolution. In this study, surface water in the Duoqu basin of Jinsha River located in Hengduan mountain region of Eastern Tibet was selected as the representative case. Twenty-three groups of surface water samples were collected to analyze the hydrochemical characteristics and ion sources based on correlation analysis, piper trigram, gibbs model, hydrogen and oxygen isotopic techniques. The results suggest the following: (1) The pH showed slight alkalinity with the value ranged from 7.25 to 8.62. Ca2+, Mg2+ and HCO3– were the main cations and anions. HCO3-Ca and HCO3-Ca·Mg were the primary hydrochemical types for the surface water of Duoqu River. The correlation analysis showed that TDS had the most significant correlation with Ca2+, Mg2+ and HCO3–. Analysis on hydrogen and oxygen isotopes indicated that the surface rivers were mainly recharged by atmospheric prec...