Groundwater Hydrochemical Characteristics and Main Ion Sources in Baiyangdian Basin
Groundwater plays a vital role in water resources and a key process of watershed water cycle.Baiyangdian basin was taken as the typical area to analyze the major ion sources and influence factors by using Piper diagram,ion ratio coefficient method,and forward succession model.The results show that the major cation in groundwater in the Baiyangdian Basin is Na+,and the major anion is HCO3-.The hydrochemical types of shallow groundwater are mainly Ca·Mg-HCO3 and Ca·Mg-HCO3·NO3,while deep groundwater types are mainly Na-HCO3 and Na·Mg--HCO3.Rock weathering is the main source of ions in groundwater,with carbonate rock weathering contributing the most(47.83％),followed by silicate rock(29.65％)and evaporite rock(13.52％).The major ions are influenced by rock weathering,dissolution-filtration processes,cation exchange,and human activities.In the piedmont alluvial plain area,agricultural activities have a significant impact on shallow groundwater,while shallow groundwater near Baiyangdian is more influenced by industrial activities.These research findings can provide valuable insights and guidance for the protection and improvement of the water ecological environment in the Baiyangdian Basin and Xiong'an New Area.
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