음성지역 지하수의 수리화학적 특성에 대한 심도, 모암 및 광화대의 영향 = Effect of well depth, host rocks and meneralization zone on hydrochemical characteristics of groundwater in the Umsung area

다국어 초록 (Multilingual Abstract)

The purpose of this study is to investigate the hydrochemical characteristics of groundwater in the Umsung area, and to elucidate the effect of host rock type, well depth and mineralization zone on the groundwater chemistry. The geology of the study area consists of Jurassic granite and Cretaceous sedimentary rocks, which are bounded by a fault. Most of shallow groundwaters exploited in the Jurassic granite area are used for agricultural purpose, whereas the deep groundwaters in the Cretaceous sedimentary rocks are used for a drinking water. The shallow groundwater shows weak acidic pH, the electrical conductivity ranging from 142 to 903 μS/cm, and the chemical type of Ca-HCO3 to Ca-Cl(SO4, NO3). A few of shallow groundwaters are contaminated by nitrate, and show high concentration of Fe,Mn and Zn, that reflects the effect of a mineralization zone. The deep groundwater shows neutral to weak alkaline pH, higher electrical conductivity than that of shallow groundwater, and the chemical type of Ca-HCO3. The seepage water from the abandoned mines does not have the characteristics such as acidic pH, high concentration of heavy metals and high sulfate content. The hydrogen and oxygen isotopes of groundwater indicates an altitude effect of the recharge area between deep groundwater and shallow groundwater. In conclusion, the chemical composition of groundwater complicately reflects the effects of their host rocks, well depth, agricultural activity and mineralization zone in the study area.

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