摘要
Abstract
In order to study the characteristics and main sources of hydrochemical components of karst groundwater in Pingyin County and serve the rational development of groundwater and the construction of the ecological environment in Pingyin County,73 groups of water samples were systematically collected.Methods such as Pearson statistical analysis,Piper diagram,correlation analysis,Gibbs diagram,ion ratio relationship and principal component analysis were used to analyze the hydrochemical characteristics,sources of main ions and controlling factors of karst groundwater in the study area.The results show that the karst groundwater is weakly alkaline,with Ca2+ as the main cation and HCO3- as the main anion.The hydrochemical types of karst groundwater are mainly the HCO3-Ca type,followed by the HCO2·SO4-Ca type.Among them,the content of main ions in Ordovician karst groundwater is higher than that in Cambrian karst groundwater,and Ordovician karst groundwater is more strongly affected by human activities.Three major factors,namely,water-rock reaction,human engineering activities and cation exchange,jointly control the evolution process of karst groundwater,among which the water-rock reaction is the main factor for the formation of karst groundwater.Ca2+,Mg2+ and HCO3- mainly come from the weathering and dissolution of carbonate rocks.SO42- and Cl⁻mainly come from the dissolution of salt rocks.Na+ and K+ come from the dissolution of silicate and salt rocks.NO3- mainly comes from the discharge of feces and sewage,followed by the application of agricultural fertilizers.关键词
水化学/控制因素/离子比值/主成分分析/岩溶地下水/平阴县Key words
Hydrochemistry/Controlling factors/Ion ratio/Principal component analysis/Karst groundwater/Pingyin County分类
地质学
