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为研究张掖盆地的地下水化学特征,对研究区56组水样的9项指标综合运用描述性分析、因子分析和聚类分析的方法进行系统分析。结果表明:张掖盆地的水化学类型沿地下水的补径排路径呈现出明显的水文地球化学分带特征。影响研究区水化学特征的主要因素是以Cl-、SO2-4、Na+、TDS、Mg2+、总硬度为主要载荷变量的蒸发浓缩作用,贡献率高达58.922%;其次是以Ca2+和HCO-3为主要载荷变量的补给溶滤作用,贡献率为25.162%。Q型聚类分析大致划分了地下水的补给径流区和排泄区,体现了不同区域的水化学类型的差异性。
In order to study the chemical characteristics of groundwater in Zhangye basin, nine indicators of 56 water samples in the study area were systematically analyzed using descriptive analysis, factor analysis and cluster analysis. The results show that the hydrochemical types of Zhangye basin show obvious hydrogeochemical zoning characteristics along the path of recharge path of groundwater. The main factors influencing the hydrochemical characteristics in the study area are the evaporative concentration of Cl-, SO2-4, Na +, TDS, Mg2 + and total hardness as the main load variables, with a contribution rate as high as 58.922%; followed by Ca2 + and HCO-3 The main load variables of the supply of leaching, the contribution rate of 25.162%. Q-type cluster analysis roughly divides the groundwater recharge runoff area and drainage area, reflecting the different types of water chemistry.