滹沱河冲洪积扇含水层是石家庄市重要的地下水源，在城市供水安全保障中发挥着重要作用。开展地下水化学演变特征及影响因素分析，可科学的识别人为活动对地下水化学的影响，从而为保障地下水安全提供重要依据。通过水化学方法和多元统计方法，对研究区109组地下水和7组地表水样品的16组化学指标进行分析研究。结果表明，地下水HCO3和HCO3·SO4型水在全区分布广泛，HCO3·Cl和Cl·HCO3型水主要分布在滹沱河冲洪积扇顶部的南部区域及滹沱河以北的藁城-无极一带。不同时段地下水化学数据对比分析结果显示，研究区地下水化学类型种类由少变多，呈现复杂化的演变特征，且受人类活动影响的地下水化学类型分布范围呈增加趋势。主成分分析结果显示，研究区地下水化学演化主要受控于地下水超采和水岩作用，其次为污水入渗和粪肥渗滤。

The Weihe River alluvial fan aquifer is an important groundwater source in Shijiazhuang City and plays an important role in urban water supply security.Study on groundwater hydrochemical characteristics and controlling factors can scientifically identify the natural and anthropogenic factors and can provide reasonable basis for groundwater security.In this paper,109 groundwater sample and 7 surface water sample were obtained to analyze sixteen chemical parameters using hydrochemical method and multivariate statistical method.The results indicated that the HCO3 and HCO3·SO4 facies widely distributed in the whole area.HCO3·Cl facies were mainly distributed in the southern area of the top of Hutuo River alluvial fan and in the Yicheng Wuji area of northern Hutuo River.The comparative analysis in different time periods revealed that groundwater chemistry evolved to more facies,with an increasing trend of groundwater facies affected by anthropogenic factors.The results obtained by principal component analysis exhibited that the evolution of groundwater in the area was mainly controlled by the water rock interaction and overexploitation of groundwater as well as sewage and manure.

中国地质调查局国土资源大调查项目（DD20160309）；中国地质科学院基本科研业务费专项（SK201912）