Analysis of characteristics and influencing factors of groundwater chemical evolution of typical alluvial fans of rapid urbanization
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Abstract:
The Weihe River alluvial fan aquifer is an important groundwater source in Shijiazhuang City and plays an important role in urban water supply security.Study on groundwater hydrochemical characteristics and controlling factors can scientifically identify the natural and anthropogenic factors and can provide reasonable basis for groundwater security.In this paper,109 groundwater sample and 7 surface water sample were obtained to analyze sixteen chemical parameters using hydrochemical method and multivariate statistical method.The results indicated that the HCO3 and HCO3·SO4 facies widely distributed in the whole area.HCO3·Cl facies were mainly distributed in the southern area of the top of Hutuo River alluvial fan and in the Yicheng Wuji area of northern Hutuo River.The comparative analysis in different time periods revealed that groundwater chemistry evolved to more facies,with an increasing trend of groundwater facies affected by anthropogenic factors.The results obtained by principal component analysis exhibited that the evolution of groundwater in the area was mainly controlled by the water rock interaction and overexploitation of groundwater as well as sewage and manure.
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