阿子营黄龙泉域地下水化学特征及演化

Chemical Characteristics and Evolution of Groundwater in Huanglong Spring Catchment of Aziying

为认识岩溶泉域地下水化学特征及演化,通过监测昆明市阿子营黄龙泉域地下水化学参数,耦合运用Piper三线图、Schoeller图、主要离子比值法、反向水文地球化学等揭示岩溶泉域地下水化学特征及补给演化过程。结果表明:(1)黄龙泉域岩溶地下水阳离子以Ca^(2+)、Mg^(2+)为主,阴离子以HCO^(-)_(3)、SO^(2-)_(4)为主,水化学类型以Ca-HCO3和Ca-Mg-HCO3为主。(2)泉域地下水离子主要源于方解石、白云石等碳酸盐岩的溶滤,其次为岩盐、硫酸盐、硅酸盐的溶解及阳离子交换作用。(3)补给区(洞穴水)向排泄区(泉水)的路径上发生方解石、白云石、石膏、萤石的沉淀,岩盐的溶解及阳离子(Ca^(2+)、Mg^(2+)、Na^(+)、K^(+))交换作用等。岩溶地下水化学过程受碳酸盐矿物风化溶解作用、离子交换作用和混合补给作用共同影响。研究为进一步探索岩溶地下水化学特征及演化机制,力求为广大岩溶地区水资源保护与开发提供科学参考。

In order to understand the chemical characteristics and evolution of groundwater in karst spring catchment,the chemical parameters of groundwater in Huanglong spring catchment of Aziying,Kunming city were monitored,and the chemical characteristics and recharge evolution process of groundwater in karst spring catchment were revealed by Piper diagram,Schoeller diagram,main ion ratio method and reverse hydrogeochemistry.The following results were obtained,(1)The cations in karst groundwater in Huanglong spring catchment were mainly Ca^(2+)and Mg^(2+),the anions were mainly HCO^(-)_(3)and SO^(2-)_(4),and the hydrochemical types were mainly Ca-HCO3and Ca-Mg-HCO3;(2)The groundwater ions in spring catchment mainly came from the dissolution of calcite,dolomite and other carbonate rocks,followed by the dissolution of halite,sulfate and silicate and cation exchange;(3)The precipitation of calcite,dolomite,gypsum and fluorite,the dissolution of halite and the exchange of cations(Ca^(2+),Mg^(2+),Na^(+),K^(+))occurred along the path from recharge area(cave water)to discharge area(spring water).The chemical process of karst groundwater was affected by weathering and dissolution of carbonate minerals,ion exchange and mixed recharge.This study provides the basis for further exploration the chemical characteristics and evolution mechanism of karst groundwater,and provides scientific reference for the protection and development of water resources in karst areas.