河北省高碑店市浅层地下水水化学演化特征及其形成机制

Hydrochemical evolution characteristics and formation mechanism of shallow groundwater in Gaobeidian,Hebei

为满足京津冀协同发展、新型城镇化和生态文明建设的需求,对高碑店市的浅层地下水水化学演化开展了研究。在对该市27个浅层地下水样品进行分析的基础上,利用水化学分区、Gibbs图、离子相关分析图等方法对研究区的地下水水化学演化特征及形成机制进行了分析与探讨。研究表明,在浅层地下水的流动方向上,地下水水化学类型由HCO_(3)-Ca·Mg型向HCO_(3)-Na·Ca型逐步演化;影响研究区地下水化学组分的主要自然因素为岩石的溶滤作用,且主要来自硅酸岩的风化及碳酸盐岩的溶解;由于发生了阳离子交换作用,Na^(+)浓度随着地下水流动逐渐升高,Ca^(2+)浓度则逐渐降低;研究区地下水中NO_(3)^(-)的来源途径多样,除了自然因素之外,人类活动(如工业污染)对NO_(3)^(-)浓度的影响也比较大。

For the Beijing-Tianjin-Hebei coordination development,and the new urbanization and ecological civilization construction for geological work in Hebei,the shallow groundwater hydrochemical evolution of Gaobeidian is studied in this paper.Based on 27 shallow groundwater samples in Gaobeidian,the hydrochemical evolution characteristics and formation mechanism of groundwater in the study area were analyzed and discussed by hydrochemical zoning,Gibbs chart and ion correlation analysis chart and other methods.The research shows that in the direction of the shallow groundwater flow,the hydrochemical types of groundwater gradually evolve from HCO_(3)-Ca·Mg type to HCO_(3)-Na·Ca type.The main natural factor affecting the chemical composition of groundwater in the study area is the leaching of rock,which mainly comes from the dissolution of silicic acid rock and carbonate rock.Because of cation exchange,the concentration of Na^(+)increased gradually with the flow of groundwater,while the concentration of Ca^(2+) decreased gradually.It is proved that there are various sources of NO_(3)^(-) in groundwater in the study area.Besides natural factors,human activities(such as industrial pollution)also make a great contribution to NO_(3)^(-) concentration.