Application of Multiple Approaches to Investigate the Hydrochemistry Evolution of Groundwater in an Arid Region: Nomhon, Northwestern China

Water

Dan Zhao¹  Liang Guo¹  Pengpeng Zhou¹  Guangcai Wang¹  Zheming Shi²  Wanjun Jiang²  Fu Liao²  Nuan Yang² 

[1] MOE Key Laboratory of Groundwater Circulation and Environment Evolution, China University of Geosciences (Beijing), Beijing 100083, China;;State Key Laboratory of Biogeology and Environmental Geology &

关键词: groundwater evolution;    water–rock interaction;    hydrogeochemical modeling;    stable isotope;   

DOI  :  10.3390/w10111667

来源: DOAJ

【 摘 要 】

Groundwater is a critical water resource for human survival and economic development in arid and semi-arid areas. It is crucial to understand the groundwater circulation and hydrochemical evolution for sustainable management and utilization of groundwater resources in those areas. To this end, an investigation of the hydrochemical characteristics of surface water and groundwater was conducted in Nomhon, an arid area located in the Qaidam Basin, northwest China, by using hydrochemical (major and trace elements) and stable isotopes (δD and δ¹⁸O) approaches. Stable isotopes and ion ratios were analyzed to determine the recharge sources, hydrochemistry characteristics, and major hydrogeochemical processes. Meanwhile, inverse geochemistry modeling was applied to quantitatively determine the mass transfer of hydrogeochemical processes. The results showed that groundwater in the study area is mainly recharged by atmospheric precipitation in mountainous areas, and the groundwater in the center of basin might originate from ancient water in cold and humid environments. Along the groundwater flow path, the TDS of groundwater increased gradually from fresh to salty (ranging from 462.50 to 19,604.40 mg/L), and the hydrochemical type changed from Cl·HCO₃⁻Na·Mg·Ca to Cl⁻Na. Groundwater chemical composition and mass balance modeling results indicated that from alluvial fan to lacustrine plain, the main hydrogeochemical processes changed from the dissolution of halite and albite and the precipitation of dolomite and kaolinite to the dissolution of halite and gypsum, precipitation of calcite, redox (SO₄²⁻ reduction), and cation exchange. This study would be helpful for water resources management in this area and other similar areas.

【 授权许可】

Unknown