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基于主成分分析,以贵州后寨典型岩溶含水系统为例,对该区1995年8月到1996年8月的10个代表性站点的20个变量进行分析,结果表明,前两个主成分综合携带了全部信息的89.3%。从变量的主成分判别平面图上得出第一主成分F1主要由Ca2+、SIc(方解石饱和指数)、SId(白云石饱和指数)、HCO3-、总硬度、Mg2+决定,第二主成分F2主要由K++Na+、Cl-、SO24-、HCO3-/SO24-、TOD、水温等决定;水流流经地层的岩性是后寨流域内岩溶含水系统水化学类型和各种水化学参数在空间和时间上变化的主要控制因素,次要因素是地下水的水动力条件特别是地下水的径流深度。水文地球化学信息对地下水系统的水动力特征分析具有指示意义,而主成分分析法耦合水动力和水化学方面的信息,为深入了解岩溶含水系统水动力化学特征提供了一种途径。
Based on the principal component analysis, taking the typical karst aquifer system in Houzhai of Guizhou as an example, 20 variables of 10 representative sites in this area from August 1995 to August 1996 were analyzed. The results show that the first two principal components Carry 89.3% of all information. The first principal component F1 is mainly determined by Ca2 +, SIc (saturation index of calcite), SId (saturation index of dolomite), HCO3-, total hardness and Mg2 + from the principal component discriminant plan of variable. The second principal component F2 mainly consists of K ++ Na +, Cl-, SO24-, HCO3- / SO24-, TOD, water temperature and so on. The lithology of the water flow through the strata is a function of the water chemistry type and water chemistry parameters of the karst water system in the Houzhai basin. The main controlling factor of the time change is the secondary factor that is the hydrodynamic conditions of groundwater, especially the runoff depth of groundwater. Hydrogeochemical information is indicative of the hydrodynamic characteristics of groundwater systems. Principal component analysis coupled with hydrodynamic and hydrochemistry information provides a way to understand the hydrodynamic characteristics of karst aquifer systems.