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Evaluation of Groundwater Quality Deterioration using the Hydrogeochemical Characteristics of Shallow Portable Groundwater in an Agricultural Area
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  • Journal title : The Journal of Engineering Geology
  • Volume 25, Issue 4,  2015, pp.533-545
  • Publisher : The Korea Society of Engineering Gelolgy
  • DOI : 10.9720/kseg.2015.4.533
 Title & Authors
Evaluation of Groundwater Quality Deterioration using the Hydrogeochemical Characteristics of Shallow Portable Groundwater in an Agricultural Area
Yang, Jae Ha; Kim, Hyun Koo; Kim, Moon Su; Lee, Min Kyeong; Shin, In Kyu; Park, Sun Hwa; Kim, Hyoung Seop; Ju, Byoung Kyu; Kim, Dong Su; Kim, Tae Seung;
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Spatial and seasonal variations in hydrogeochemical characteristics and the factors affecting the deterioration in quality of shallow portable groundwater in an agricultural area are examined. The aquifer consists of (from the surface to depth) agricultural soil, weathered soil, weathered rock, and bedrock. The geochemical signatures of the shallow groundwater are mostly affected by the NO3 and Cl contaminants that show a gradual downward increase in concentration from the upper area, due to the irregular distribution of contamination sources. The concentrations of the major cations do not varied with the elapsed time and the NO3 and Cl ions, when compared with concentrations in background groundwater, increase gradually with the distance from the upper area. This result suggests that the water quality in shallow groundwater deteriorates due to contaminant sources at the surface. The contaminations of the major contaminants in groundwater show a positive linear relationship with electrical conductivity, indicating the deterioration in water quality is related to the effects of the contaminants. The relationships between contaminant concentrations, as inferred from the ternary plots, show the contaminant concentrations in organic fertilizer are positively related to concentrations of NO3, Cl, and SO42− ions in the shallow portable groundwaters, which means the fertilizer is the main contaminant source. The results also show that the deterioration in shallow groundwater quality is caused mainly by NO3 and Cl derived from organic fertilizer with additional SO42− contaminant from livestock wastes. Even though the concentrations of the contaminants within the shallow groundwaters and the contaminant sources are largely variable, it is useful to consider the ratio of contaminant concentrations and the relationship between contaminants in groundwater samples and in the contaminant source when analyzing deterioration in water quality.
drinking groundwater;shallow aquifer;hydrogeochemistry;agricultural area;groundwater quality deterioration;
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