Environmental background values of shallow groundwater in the Guanzhong Basin
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Abstract:
Relatively detailed environmental units of shallow groundwater were divided in the Guanzhong Basin on the basis of the intensive study of groundwater flow field, recharge and discharge conditions and groundwater environment. Natural background levels of K++Na+,Ca2+,Mg2+,Cl-,SO42-,HCO3-,TDS of different units were calculated by using the iterative 2-σ technique, the calculated distribution function, and the spatial distribution regularity of background levels for major components as well as its controlling factors were discussed on the basis of 487 groundwater samples collected from the Guanzhong Basin. The results indicated that the spatial distribution of the major components was mainly controlled by groundwater recharge, runoff, discharge and hydrogeochemical process, in which the anion in the area was mainly HCO3-, the cation in the north shore of Weihe was mainly K++Na+ while in the south shore of Weihe was mainly Ca2+; moreover, the hydrogeochemical process in the northern area of Weihe was mainly mineralization and evaporation, and in the southern area of Weihe was mainly lixiviation. The results obtained provide scientific reference for the evaluation of groundwater contamination and the future development and protection of water resources.
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