Relationship Between the Groundwater Resistivity and NaCl Equivalent Salinity in Western and Southern Coastal Areas, Korea

국내 서.남해 해안지역 지하수의 전기비저항과 등가 NaCl 염분도와의 관계

  • Hwang, Se-Ho (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resource) ;
  • Park, Kwon-Gyu (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resource) ;
  • Shin, Je-Hyun (Groundwater & Geothermal Resources Division, Korea Institute of Geoscience and Mineral Resource) ;
  • Lee, Sang-Kyu (Vice presidential office, Korea Institute of Geoscience and Mineral Resource)
  • 황세호 (한국지질자원연구원 지하수지열연구부) ;
  • 박권규 (한국지질자원연구원 지하수지열연구부) ;
  • 신제현 (한국지질자원연구원 지하수지열연구부) ;
  • 이상규 (한국지질자원연구원 선임연구부)
  • Published : 2007.11.30

Abstract

In this paper, we suggested the relationship between resistivity of coastal groundwater and NaCl equivalent salinity for the quantitative interpretation the results of surface/borehole resistivity and electromagnetic data. 38 groundwater samples having electrical conductivity higher than about 1,000 ${\mu}S/cm$ were analyzed to derive the empirical relationship between groundwater resistivity and NaCl equivalent salinity. We used Schlumberger chart GEN-8 to convert ion concentration from hydrochemical analysis to the equivalent NaCl salinity, and the portable meter to measure the in situ electrical conductivity of groundwater samples. From the hydrochemical analysis, relationship between the groundwater resistivity $(R_w)$ and equivalent NaCl salinity (Eq_NaCl) is expressed as Eq_NaCl=$5935.3551{\times}R_w^{-1.0993}$, and relationship between the groundwater electrical conductivity (EC) and total dissolved solids (TDS) is expressed as TDS=0.721*EC. We believe these relationships are very useful to assess the seawater intrusion in western and southern coastal area.

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