Major ions chemistry of groundwater in the arid region of Zhangye Basin, northwestern China
Major ions chemistry of groundwater in the arid region of Zhangye Basin, northwestern China
复制标题
DOI：
10.1007/s12665-009-0364-2
复制
发表时间：
2010-08
影响因子：
2.8
通讯作者：
Juan Chang;Genxu Wang
中科院分区：
文献类型：
--
作者：
Juan Chang;Genxu Wang
作为世界上最干旱的地区之一，研究区域张掖盆地位于黑河中游，中国西北部。除了干旱，快速的社会和经济发展也刺激了对水的更大需求，这一需求逐渐通过地下水开采来满足。应用常规水化学技术和统计分析方法，对张掖盆地地下水的主要离子化学和水化学过程进行了研究。化学分析结果表明，研究区地下水中没有一对阳离子和阴离子的比例超过50%。HCO_3、−-Mg~(2+)、SO_4~(2+)、−~(2+)、SO_4~(2+)、−~(2+)、Cl~(−-Na+)之间呈高度正相关。TDS主要取决于主要离子如HCO3-−、SO42-−、Cl-−、Mg~(2+)和Na+的浓度。本区水化学类型可分为两大类：第一类包括镁-钠-碳酸根−、镁-钠-钙-碳酸根−-SO42−和镁-钙-钠-硫酸根−-碳酸氢根−。第二类包括Mg~(2+)-Ca~(2+)-SO_4~(2+)−型、Mg~(2+)-Ca~(2+)-SO_4~(2+)−-Cl−型和Mg~(2+)-Na~+-SO_4~(2+)−-Cl−型。离子比图和饱和指数计算表明，硅酸盐风化作用和蒸发作用是决定研究区主要离子组成的主要因素。
As one of the most arid regions in the world, the study area, Zhangye Basin is located in the middle reaches of the Heihe River, northwest China. Besides aridity, rapid social and economic development also stimulates greater demand for water, which is gradually fulfilled by groundwater extraction. In this study, the conventional hydrochemical techniques and statistical analyses were applied to examine the major ions chemistry and hydrochemical processes of groundwater in the Zhangye Basin. The results of chemical analysis indicate that no one pair of cations and anions proportions is more than 50% in the groundwater samples of the study area. High-positive correlations were obtained among the following ions: HCO3−–Mg2+, SO42−–Mg2+, SO42−–Na+and Cl−–Na+. TDS depends mainly on the concentration of major ions such as HCO3−, SO42−, Cl−, Mg2+and Na+. The hydrochemical types in the area can be divided into two major groups: the first group includes Mg2+–Na+–HCO3−, Mg2+–Na+–Ca2+–HCO3−–SO42−and Mg2+–Ca2+–Na+–SO42−–HCO3−types. The second group comprises Mg2+–Ca2+–SO42−type, Mg2+–Ca2+–SO42−–Cl−type and Mg2+–Na+–SO42−–Cl−type. The ionic ratio plot and saturation index calculation suggests that the silicate weathering, to some extent, and evaporation are dominant factors that determine the major ionic composition in the study area.