Groundwater chemical characteristics and analysis of the controlling factors in parallel ridge valley area of Guang'an City
The eastern Qujiang of Guang'an City is a typical paralleled ridge valley area with unique hydrogeologi-cal conditions.The Piper triplex map,Gibbs map,Phreeqc software,ion proportional coefficient map and Pear-son correlation analysis methods were used to study the chemical characteristics and the controlling factors of groundwater.And the spatial distribution of groundwater chemical components,water-rock interaction types and groundwater chemical components source and its controlling factors were comprehensively analyzed combined with regional hydrogeological conditions.The results show that shallow groundwater in the study area is low TDS fresh water.The shallow groundwater anions are mainly HCO3-,SO42-,and the cations are mainly Ca2+,Na+.The groundwater types are mainly HCO3--Ca2+,HCO3--Ca2+.Mg2+and HCO3-Ca2+·Na+.The groundwater hydrochemical component mainly comes from the weathering of carbonate rock and silicate karst filtration,and salt rock has little effect on groundwater.The potassium salt,gypsum,anhydrite,salt rock and fluorite in groundwater are all in the unsaturated state,and the related minerals in the strata are the sources of related ions in groundwa-ter.The chemical components of groundwater are mainly controlled by leaching,positive cation exchange,coal mining and agricultural activities.The research results could provide some scientific basis for the rational develop-ment and utilization of water resources in the study area,ecological environmental protection,and economic derelopment of Chengdu-Chongqiang region.
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