In arid and semiarid regions,most of the diffuse recharge resides in unsaturated zone,and the forceful evapotranspiration results in the changes of chlorideconcentration in soil water.The chloride tracer method based on the conservation of mass,by making a comparison between the chloride concentration of soil water and that of deposition of precipitation,could be used for estimation local recharge of groundwater and probably analyzing the past recharge conditions.In this paper the chloride balance method an...
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