Hydrogeochemical Evolution of Groundwater in Guanzhong Basin
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Abstract:
Based on the hydrogeological conditions in of the Guangzhong Basin and, the regional hydrochemical evolution characteristics of groundwater, the formation mechanism of unconfined groundwater wasere analyzed. The results showed that (1) aht from diving contour and hydrochemical type map, the types of groundwater chemisty and groundwater dynamic have horizontal zoning characteristics, and groundwater dynamic field plays a controling rollcontrols the distribution ofon groundwater chemistry; (2). Cl- concentration and TDS can reflect the intensity of evaporation in the study area; and (3)intensity. Chloride alkaline indices reflect the ion exchange occurs mainly appear in high concentration of groundwater with high salinity in study area. The results of PHREEQC simulation showed that aAlong groundwater flow direction, it mainly occurs the precipitation of calcite and gypsum and the cation exchange of Na+ and Ca2+ occur at paths 1 and 2; whereas. However, at path 3, it mainly occurs the precipitation of calcite and dissolution of gypsum and dolomite, and it also has the exchange of Mg2+ and Ca2+ in addition to Na+ and Ca2+ occur at path 3.
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