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http://dx.doi.org/10.5467/JKESS.2020.41.6.630

Chemical Characteristics of Shallow Groundwater in an Agricultural District of Hyogyo-ri Area, Chungnam Province  

Jeon, Hang-Tak (Department of Geological Sciences, Pusan National University)
Hamm, Se-Yeong (Department of Geological Sciences, Pusan National University)
Choi, Eun-Gyeong (GI Co.)
Kim, HyunKoo (Soil and Groundwater Research Division, National Institute of Environmental Research)
Kim, MoonSu (Soil and Groundwater Research Division, National Institute of Environmental Research)
Park, Ki-Hoon (Geogreen 21 Co.)
Lim, Woo-Ri (Department of Geological Sciences, Pusan National University)
Publication Information
Journal of the Korean earth science society / v.41, no.6, 2020 , pp. 630-646 More about this Journal
Abstract
In rural areas, nitrate-nitrogen (NO3-N) pollution caused by agricultural activities is a major obstacle to the use of shallow groundwater as domestic water or drinking water. In this study, the water quality characteristics of shallow groundwater in Hyogyo-ri agricultural area of Yesan-gun, Chungcheongnam-do province was studied in connection with land use and chemical composition of soil layer. The average NO3-N concentration in groundwater exceeds the domestic and agricultural standard water qualities of Korea and is caused by anthropogenic sources such as fertilizer, livestock wastewater, and domestic sewage. The groundwater type mainly belongs to Ca(Na)-Cl type, unlike Ca-HCO3 type, a general type of shallow groundwater. The average NO3-N concentration (7.7 mg L-1) in groundwater in rice paddy/other (upstream, ranch, and residential) area is lower than the average concentration (22.8 mg L-1) in farm field area, due to a lower permeability in paddy area than that in farm field area. According to the trend analysis by the Mann-Kendall and Sen tests, the NO3-N concentration in the shallow groundwater shows a very weak decreasing trend with ~0.011 mg L-1yr-1 with indicating almost equilibrium state. Meanwhile, SO42- and HCO3- concentrations display annual decreasing trend by 15.48 and 13.15%, respectively. At a zone of 0 to 5 m below the surface, the average hydraulic conductivity is 1.86×10-5 cm s-1, with a greater value (1.03×10-4cm s-1) in sand layer and a smaller value (2.50×10-8 cm s-1) in silt layer.
Keywords
Shallow groudnwater; agricultural area; characteristics of water quality; nitrate-nitrogen; permeability;
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Times Cited By KSCI : 2  (Citation Analysis)
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