Hydrochemistry of urban groundwater in Seoul, South Korea: effects of land-use and pollutant recharge |
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Authors: | Byoung-Young Choi Seong-Taek Yun Soon-Young Yu Pyeong-Koo Lee Seong-Sook Park Gi-Tak Chae Bernhard Mayer |
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Institution: | (1) Department of Earth and Environmental Sciences and the Environmental Geosphere Research Lab (EGRL), Korea University, 136–701 Seoul, South Korea;(2) Department of Mining and Materials, Korea Institute of Geology, 305–350 Taejon, South Korea;(3) Department of Geology and Geophysics, University of Calgary, T2 N 1N4 Alberta, Canada |
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Abstract: | The ionic and isotopic compositions (δD, δ18O, and 3H) of urban groundwaters have been monitored in Seoul to examine the water quality in relation to land-use. High tritium contents
(6.1–12.0 TU) and the absence of spatial/seasonal change of O–H isotope data indicate that groundwaters are well mixed within
aquifers with recently recharged waters of high contamination susceptibility. Statistical analyses show a spatial variation
of major ions in relation to land-use type. The major ion concentrations tend to increase with anthropogenic contamination,
due to the local pollutants recharge. The TDS concentration appears to be a useful contamination indicator, as it generally
increases by the order of forested green zone (average 151 mg/l), agricultural area, residential area, traffic area, and industrialized
area (average 585 mg/l). With the increased anthropogenic contamination, the groundwater chemistry changes from a Ca–HCO3 type toward a Ca–Cl(+NO3) type. The source and behavior of major ions are discussed and the hydrochemical backgrounds are proposed as the basis of
a groundwater management plan. |
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Keywords: | Urban groundwater Hydrochemistry Stable isotopes Land use and contamination Seoul Korea |
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