海河流域下游潜水水化学特征分析及水文地球化学模拟

海河是天津市重要的河流，为了解海河流域浅层地下水的水文地球化学特征，获取了55组水化学数据，开展离子比例关系、Gibbs图和水文地球化学模拟等相关研究。研究表明，流域附近潜水总体上呈中性或弱碱性水，沿地下水流向，水化学类型由HCO3-Na、HCO3-Na·Ca型过渡到HCO3·Cl-Na→Cl·HCO3-Na→Cl·SO4-Na型，最后过渡到滨海地区的Cl-Na型。研究区潜水化学组分主要受岩石风化控制，也受到一定程度的蒸发浓缩作用，阳离子交换作用是天津市滨海带地下水化学组分形成的重要过程。沿地下水流向，研究区地下水离子组分浓度呈递增趋势，岩盐、白云石和石膏发生溶解，方解石发生沉淀。

Hydrochemical characteristics analysis and hydrogeochemical simulation of shallow groundwater in downstream of Haihe River Basin

Haihe River is an important river in Tianjin.In order to understand the hydrogeochemistry of shallow groundwater in Haihe River Basin，obtain the basic hydrochemical data of 55 sampling points，and carry out relevant research such as ion proportion relationship，Gibbs diagram and hydrogeochemical simulation.The research shows that the shallow groundwater near the basin is generally neutral or weakly alkaline water.Along the groundwater flow direction，the hydrochemical type transitions from HCO3-Na、HCO3-Na·Ca to HCO3·Cl-Na→Cl·HCO3-Na→Cl·SO4-Na，and finally，it transits to Cl-Na in Binhai area.The chemical composition of phreatic water in the study area is mainly controlled by rock weathering and evaporation and concentration to a certain extent.Cation exchange is an important process of the formation of groundwater chemical components in the coastal zone of Tianjin.Along the groundwater flow direction，the concentration of groundwater ion components in the study area shows an increasing trend，rock salt，dolomite and gypsum are dissolved，and calcite is precipitated.