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Chemical and isotopic compositions of groundwater and stream water in a heavy agricultural basin of Korea |
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| Authors: | Jin-Yong Lee Kwang-Sik Lee Youngyun Park Hyun-Mi Choi Yun-Ju Jo |
| Institution: | 1. Department of Geology, Kangwon National University, Chuncheon, 200 701, Korea 2. Division of Earth and Environmental Science, KBSI, Ochang, 363 883, Korea 3. Research Institute for Earth & Resources, Kangwon National University, Chuncheon, 200 701, Korea 4. National Instrumentation Center for Environmental Management, Seoul National University, Seoul, 151 742, Korea |
| Abstract: | The chemical and isotopic compositions of groundwater and stream water in the Haean basin, Korea, which have been intensively used for agricultural irrigation, were examined. The field parameters and chemical compositions were typical of relatively uncontaminated waters, except for the agricultural impact. The low EC levels indicated that the waters had not experienced any significant geochemical processes such as water-rock interaction and evaporation. The very similar chemical compositions and ionic ratios were also indicative of fast circulation and good hydraulic connection. The oxygen and hydrogen isotopic compositions of most of the samples in wet and dry seasons showed very similar range which indicated a single source for both waters without any significant geochemical alteration. However, in the wet season, evaporation trends were observed in some groundwaters because of inflow of irrigation return flow from a rice paddy field. The isotopes of both waters were affected by the altitude and amount of precipitation. |
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