The set of journals have been ranked according to their sjr and divided into four equal groups four quartiles q1 green comprises the quarter of the journals with the highest values q2 yellow the second highest values q3 orange the third highest values and q4 red the lowest values. Ground water vulnerability to contamination was defined by the national research council 1993 as the the intrinsic susceptibility of a ground water system depends on the aquifer properties hydraulic conductivity porosity hydraulic gradients and the associated sources of water and time since recharge of ground water var. Recharge the key to groundwater pollution and aquifer vulnerability ns robins groundwater recharge and pollution vulnerability of british aquifers a critical overview ssd foster identification of the source and fate of nitrate contamination of the jersey bedrock aquifer using stable nitrogen isotopes ar green and others . What is groundwater vulnerability groundwater vulnerability is a measure of how easy or how hard it is for pollution or contamination at the land surface to reach a production aquifer stated another way it is a measure of the degree of insulation that natural and manmade factors provide to keep pollution away from groundwater. Pollution of groundwater vulnerability the sensitivity of an aquifer to contamination is based on the physical characteristics of the aquifer the overlying geologic materials and for a specific contaminant its chemical characteristics rapid recharge leaves little time for contaminants to degrade naturally or be adsorbed before
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