자원환경지질 (Economic and Environmental Geology)

  • 제42권3호
  • /
  • Pages.235-246
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  • 2009
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
권호 표지

서천 길산천 소유역의 고염분 지하수 수질과 산출 특성

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

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

서천지역 금강하구둑 부근의 길산천 소유역에서 전기전도도 12,000${\sim}$21,000 $\mu$S/cm 의 고(高)염분 지하수가 산출된다. 이러한 고염분 지하수 대수층은 심도를 달리하는 2개 모래질 퇴적층과 1개 풍화대 및 부정합면으로 구성되어 었으며, 대수층 상호간에는 수리지질 및 수리지화학적으로 단절된 양상을 보인다. 연구지역에서 산출되는 고염분 지하수의 기원에 대하여 고찰해 보기 위해, 대수층의 산출 특성, 지하수의 수질 특성, 지하수위 및 전기전도도의 시계열 관측과 주기 분석이 검토되었다. 국내 서 남해안지역에서 해수의 영향을 받은 지하수 수질은 주로 현재 진행중인 해수침투 개념에 의해 설명되는 경향이었다. 하지만 이번 연구결과 길산천 소유역 하류지역에서 보이는 고(高)염분 지하수의 수질 및 산출 특성은 해수침투라는 역동적인 메카니즘에 의한 것이 아니라, 과거 지질시대의 조간대 퇴적물내 혹은 매립지내에 포켓상으로 고립 포획된 고(古)염분 성분에 의한 것으로 해석되었다.

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.

키워드

참고문헌

  1. Akouvi, A., Dray, M., Violette, S., Marsily, G. de and Zuppi, G. M. (2008) The sedimentary coastal basin of Togo: example of a multilayered aquifer still influenced by a palaeo-seawater intrusion. Hydrogeology Journal, v. 16, p. 419-436 https://doi.org/10.1007/s10040-007-0246-1
  2. Chi, S. J., Chang, H. W., Kim, N. H., Kim, T. G., Yun, W. (2003) Water quality and stable isotope study for the brackish groundwater at Yeongkwang coastal area. Proceedings of Spring Academic Meeting for Presentation of the Korea Society of Economic and Environmental Geology, 103-107p
  3. Freeman, J. T. (2007) The use of bromide and chloride mass ratios to differentiate salt-dissolution and formation brines in shallow groundwaters of the Western Canadian Sedimentary Basin. Hydrogeology Journal, v. 15, p. 1377-1385 https://doi.org/10.1007/s10040-007-0201-1
  4. Freeze, R. A. and Cherry, J. A. (1979) Groundwater. Prentice Hall
  5. Hwang, S. H., Park, G. K., Shin, J. H., Lee, S. H., Kim, G. Y., Park, I. H., Lee, C. W., Yum, B. W., Sung, N. H. and Shim, B. W. (2005) Mitigation of Seawater Intrusion Problems. MOST, OAA2004031-2005(2), 121p
  6. Lee, B.J., Moon, S.H., Cho, B.W., Sung, I.H., and Lee, C.W. (2001) Identification of influences on groundwater fluctuations using spectrum analysis. Journal of Geological Society of Korea, v. 37, No. 2, p. 287-296
  7. Lee, B.J., Cho, B.W., Moon, S.H. and Lim, M.T. (2001) Seawater encroachment into bedrock aquifer in Dongnae, Pusan. Journal of the Geological Society of Korea, v. 37, No. 3, p. 407-420
  8. Lee, B.J., Koh, K.W., Moon, S.H., Park, Y.S. and Lim, M.T. (2004) Identification of seawater encroachment based on the characteristics of tidal fluctuation of groundwater level. Journal of the Geological Society of Korea, v. 40, No. 1, p. 53-64
  9. Lee, B.J. and Moon, S.H. (2008) Integrated approach for evaluating the characteristics of seawater intrusion using factor analysis and time series analysis: Seocheon- Gunsan area. Journal of the Geological Society of Korea, vol. 44, No. 2, p. 219-232
  10. Lee, B.J. and Hwang, S.H. (2008) Evaluation of characteristics of seawater intrusion based on the groundwater fluctuations: Baksu area, Yeonggwang-gun. Journal of the Geological Society of Korea, vol. 44, No. 2, p. 233-240
  11. Lee, S.G., Kim, S.J., Kim, Y.W., Kim, I.G., Kim, T.G., Kim, H.T., Park, I.H., Shin, J.H.,, Shin, H.M., Lee, M.J., Lee, W.S., Lee, T.S., Chi, S.J., Jin, J.H., Huh, D.G., Hwang, S.H., Hwang, I.G., Hwang, H.S. (2003) Development of the techniques for assessment, prediction and prevention of seawater intrusion. MOST, 00-JND-01-B-14, 233p
  12. MAF(Ministry of Agriculture and Forestry), Korea Rural Community and Agricultural Corporation (2006) Report for Saltwater Intrusion Monitoring Network
  13. MOCT(Ministry of Construction and Transportation), KOWACO(Korea Water Resources Development Corporation, KIGAM(Korea Institute of Geoscience and Mineral Resources) (2003) Basic Groundwater Survey Report for Seocheon-Gunsan Area, 267p
  14. Park, K.G. (2008) Personal communication
  15. Park, S.C., Yun, S.T., Chae, G.T. and Lee, S.K. (2002) Hydrogeochemistry of shallow groundwaters in western coastal area of Korea: a study on seawater mixing in coastal aguifers. Journal of KoSSGE, v.7, p.63-77
  16. Smith, S. W. (1997) The scientist and engineer's guide to digital signal processing. California technical publishing, San Diego, California, 98p