基于水文地球化学模拟分析——以涉县东风湖泉域岩溶地下水为例

Based on the Analysis of Hydrogeochemical Simulation—A Case Study of Karst Groundwater in Dongfeng Lake of Shexian

为揭示涉县东风湖泉域岩溶地下水化学特征及演化规律,运用Piper三线图、Gibbs图与离子比例法对泉域内14个岩溶水样的地下水化学特征及水化学组分形成作用系统分析,最后通过饱和指数分析与反向模拟查明了研究区地下水化学演化机理。结果显示:研究区水化学类型主要为HCO_(3)-Ca·Mg型或HCO_(3)-Ca型,地下水水化学特征主要受岩石风化作用控制,地下水从补给区到排泄区径流过程中水样发生方解石、石膏、岩盐溶解,白云石沉淀,阳离子交替吸附为Ca^(2+)—Na^(+)朝正向进行。从强径流区到排泄区水-岩作用为方解石、岩盐沉淀,而白云石、石膏溶解,地下水中Ca^(2+)置换出含水介质中Na^(+)离子。

To reveal the chemical characteristics and evolution of karst groundwater in Shexian Dongfeng Lake,the piper three-line diagram,gibbs diagram and ion ratio method were used to systematically analyze the chemical characteristics of groundwater and the formation of hydrochemical components of 14 karst water samples in the spring area.Finally,the chemical evolution of groundwater in the area was studied through saturation index analysis and inverse simulation mechanism.The results show that the water chemistry type of the study area is mainly HCO_(3)-Ca·Mg type or HCO_(3)-Ca type.Chemistry characteristics of groundwater are mainly controlled by the weathering of rocks.Calcite and gypsum occur in the water samples during the runoff process from the recharge area to the drainage area rock salt is dissolved,dolomite is precipitated,and cations alternately adsorb as Ca^(2+)—Na^(+)in the positive direction.From the strong runoff area to the drainage area,the water-rock interaction is the precipitation of calcite and rock salt while the dissolution of dolomite and gypsum.Ca^(2+)in the groundwater replaces Na^(+)in the aqueous medium.