Hydrogeochemical Characteristics and Occurrences of High-Saline Ground Water at Seocheon Area, Korea

서천 길산천 소유역의 고염분 지하수 수질과 산출 특성

  • 문상호 (한국지질자원연구원 지구환경연구본부 지하수토양연구실) ;
  • 이봉주 (한국지질자원연구원 지구환경연구본부 지하수토양연구실) ;
  • 박권규 (한국지질자원연구원 지구환경연구본부 지하수토양연구실) ;
  • 고경석 (한국지질자원연구원 지구환경연구본부 지하수토양연구실)
  • Published : 2009.06.28

Abstract

High-saline ground water, whose eclectrical conductivity value ranges from 12,000 to 21,000 $\mu$S/cm, occurs at the small catchment of Gilsan stream near Geum-river estuary dike. These high-saline ground water comes form three different aquifers consisting of two horizons of sand sediments and one weathered zone with top part of unconformity. For these three aquifers showing mutual independence in terms of hydrogeological and hydrogeochemical connection, we examined characteristics of aqifer occurrences and their water chemistry, and observed and analyzed the fluctuations of the ground water level and electrical conductivity. Our study results indicate that the high-saline characteristics of ground water in this study area should not come from dynamic recent seawater intrusion, but might be due to the fossil saline water included and isolated within the paleo-sediments or weathered zone and their upper unconformity part. This high-saline water seems to be now partially mixed and affected by freshwater in the higher inland reach of Gilsan stream.

Keywords

Seocheon;Gilsan stream;high-saline ground water;fossil saline water

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