Arid Zone Research ›› 2020, Vol. 37 ›› Issue (1): 105-115.

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Hydrogeochemical Evolution Process of Groundwater in the Eastern Plains in Changji Hui Autonomous Prefecture,Xinjiang

LEI Mi1, 2, ZHOU Jin-long1, 2, WU Bin1, 2, FAN Wei1, 2, ZHANG Jie1, 2   

  1. 1. College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, Xinjiang,China;
    2. Xinjiang Center for Hydrology and Water Resources Engineering Research, Urumqi 830052,Xinjiang,China

  • Received:2019-03-25 Revised:2019-05-16 Online:2020-01-15 Published:2020-01-15
  • Supported by:
    国家自然科学基金项目“喀什地区地下水咸化机理研究”(4166 2016);新疆农业大学研究生“水利工程”重点学科研究项目(SLXK-YJS-2018-04)资助

Abstract:

 In this paper, the test data of 63 groundwater samples in 2016 and 54 water quality monitoring data from 2012 to 2015 in the eastern plains in Changji Hui Autonomous Prefecture, Xinjiang were analyzed by the mathematical statistics, Piper diagrams, Gibbs figures, ion ratios, etc. The purposes of this study was to explore the evolution process of groundwater in the study area. The results showed that the average cationic concentrations of groundwater in the study area in 2012 were in an order of Ca2+ > K++Na+ > Mg2+, and the average anionic concentrations were in an order of HCO3- > SO42- > Cl-. After 2013, the concentration of SO42- was gradually increased but that of Ca2+ was gradually decreased. By 2016, the average cationic concentrations of groundwater were in an order of Ca2+ > K++Na+ > Mg2+, and the average anionic concentrations were in an order of HCO3- > SO42- > Cl-. The hydrochemical type evolved from HCO3—Ca·Mg (Ca·Na, Ca·Na·Mg) in 2012 to HCO3·SO4—Ca·Na·Mg (Ca·Mg, Ca·Na) in 2016, which was mainly related to the evaporation and rock weathering of aquifer medium, and the evaporation was reflected more in unconfined groundwater. Na+, K+ and Cl- in groundwater came mainly from the dissolution of rock salt; SO42- came mainly from the dissolution of gypsum (CaSO4·2H2O) and mirabilite (Na2SO4·10H2O). In addition to the dissolution of rock salt, Cl- and SO42- are also affected by human activities.

Key words: plain, groundwater; hydrogeochemistry, evolution, Changji, Xinjiang