石家庄平原区浅层地下水化学特征及成因分析

Chemical Characteristics and Genesis Analysis of Shallow Groundwater in the Plain Area of Shijiazhuang

地下水作为重要的供水水源,对其进行水化学特征及成因分析具有重要意义。以石家庄平原区浅层地下水2021年6月份所采集的67组水样为研究对象,运用统计分析、Piper三线图、Gibbs图及离子比例系数方法全面分析了地下水的水化学特征、空间分布规律及其影响因素。结果表明:研究区地下水呈弱碱性,水化学类型以HCO_(3)-Ca·Mg型和HCO_(3)·SO_(4)-Ca·Mg型为主;西部山前及中部地区的水化学指标浓度相对较低,而东南排泄区水化学指标含量较高,其中TDS、SO^(2-)_(4)、HCO^(-)_(3)、Na^(+)在辛集市南部南智邱镇地区出现极大值;盐岩风化作用是控制研究区地下水水化学成分组成的主要因素,而阳离子交替吸附作用和人为因素也对水化学组分有一定的影响。

As an important source of water supply,groundwater is of great significance to analyze its hydrochemical characteristics and causes.Those 67 water samples collected in June 2021 in the plain area of Shijiazhuang were set as the research object.The chemical characteristics,spatial distribution and influencing factors of shallow groundwater in Shijiazhuang plain area were analyzed by descriptive statistics,Piper trilinear map,Gibbs map,correlation analysis and ion ratio coefficient method.The results show that:the average pH of shallow groundwater in the study area is weakly alkaline,the groundwater chemistry is mainly HCO_(3)-Ca·Mg type and HCO_(3)·SO_(4)-Ca·Mg type.The spatial distribution of hydrochemical components is as follows:the hydrochemical indexes concentration in the western piedmont and central area are relatively low,and the hydrochemical indexes concentration in the southeast discharge area are relatively high.Among them,TDS,SO^(2-)_(4)、HCO^(-)_(3)and Na+have the maximum values in Nanzhiqiu Town in the south of Xinji City.The formation of main ions in groundwater is mainly controlled by rock weathering,the alternating adsorption of cations and human factors also have certain effects on the hydrochemical components.