국내 서.남해 해안지역 지하수의 전기비저항과 등가 NaCl 염분도와의 관계

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

  • 황세호 (한국지질자원연구원 지하수지열연구부) ;
  • 박권규 (한국지질자원연구원 지하수지열연구부) ;
  • 신제현 (한국지질자원연구원 지하수지열연구부) ;
  • 이상규 (한국지질자원연구원 선임연구부)
  • 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)
  • 발행 : 2007.11.30

초록

본 논문은 지표 및 시추공 전기 전자탐사 결과의 정량적인 해석을 위하여 해안 지하수의 전기비저항과 등가 NaCl 염분도와의 관계식을 제안하였다. 해안에서 10 km 이내에 위치하고 전기전도도가 1,000 ${\mu}S/cm$ 이상인 38개의 지하수 시료에 대한 수리지구화학 분석 결과를 이용하여 전기비저항과 등가 NaCl 염분도와의 관계식을 유도하였다. 수리지구 화학분석 결과의 등가 NaCl 염분도 환산은 Schlumberger 도표 GEN-8을 이용하였으며 전기전도도는 현장에서 휴대용 장비로 측정하였다. 본 논문에서 해안 지하수의 수리지구화학분석 결과를 이용하여 제안한 해안 지하수의 전기비저항$(R_w)$ 과 등가 NaCl 염분도(Eq_NaCl)와의 관계식은 Eq_NaCl=$5935.3551{\times}R_w^{-1.0993}$이며 전기전도도(EC)와 용존고형물총량(TDS)과의 관계식은 TDS=0.721${times}$EC와 같다. 해안대수층 지하수의 전기비저항과 등가 NaCl 염분도 및 TDS와의 관계식은 서 남해 해안지역의 해수침투 평가에 유용하게 이용될 것으로 판단된다.

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.

키워드

참고문헌

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