지구물리와물리탐사 (Geophysics and Geophysical Exploration)

  • 제17권2호
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  • Pages.104-113
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  • 2014
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  • 1229-1064(pISSN)
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  • 2384-051X(eISSN)
한국지구물리·물리탐사학회 (Korean Society of Earth and Exploration Geophysicists)
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전기비저항 모니터링 자료를 이용한 연약지반 평가를 위한 역산기법 적용 연구

Application of Inversion Methods to Evaluate the State of Soft Soil using Electrical Resistivity Monitoring Data

  • 지윤수 (강원대학교 에너지.자원공학과) ;
  • 오석훈 (강원대학교 에너지.자원공학과) ;
  • 임은상 (한국수자원공사 수자원연구원)
  • Ji, Yoonsoo (Department of Energy and Resources Engineering, Kangwon National University) ;
  • Oh, Seokhoon (Department of Energy and Resources Engineering, Kangwon National University) ;
  • Im, Eunsang (Infrastructure Technology Center, K-Water Institute)
  • 투고 : 2014.04.21
  • 심사 : 2014.04.25
  • 발행 : 2014.05.31
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초록

간척지의 연약지반 평가를 위해 전기비저항 모니터링을 실시하여 물리탐사기법의 적용성을 알아보고자 총 3개월에 걸쳐 전기비저항 모니터링 자료를 획득하였고, 이 자료들을 독립역산, 시간경과 역산, 4D 역산법으로 해석을 실시하였다. 본 연구에서는 각 역산 방법들의 비교를 통해 연약지반의 변화 특성을 잘 나타낼 수 있는 역산방법을 파악하고자 하였다. 또한, 시추자료와 콘 관입시험(Cone Penetration Test; CPT) 자료를 이용하여 각 역산방법들이 기반암과 연약지반을 명확히 구분 하는지 알아보았다. 시간경과 역산의 경우 독립역산 보다 역산 잡음이 감소하여 연약지반을 잘 반영한다는 것을 알 수 있었다. 4D 역산은 3개월 데이터 보다 장기의 데이터를 사용하면 시간경과 역산법보다 효율적인 해석방법이 될 수 있음을 파악하였다. 연약지반에서의 전기비저항 모니터링은 지반의 시공간적 전기적 상태를 연속적으로 분석 할 수 있는 유용한 방법임을 확인하였다.

Electric resistivity monitoring was applied to evaluate the soft ground in reclaimed land in order to figure out the applicability of physical prospecting. For this, electrical resistivity monitoring data were acquired for total three months and analyzed those data with independent inversion, time-lapse inversion, and 4D inversion methods. The result was compared for various inversion methods so as to figure out what showed the soft soil most properly. Moreover, drilling and CPT(Cone Penetration Test) data were also used in order to find out if each of those inversion methods could distinguish either bed rock or the soft soil clearly. And according to the result, time-lapse inversion showed less inversion artifacts than independent inversion, so it could indicate the soft soil better. If data gained for a longer period than three months are used, 4D inversion has been found to be a more efficient analysis method than the time-lapse inversion method. Electrical resistivity monitoring on the soft soil has been found to be a useful method that can analyze the spatio-temporal electric state of the ground serially.

키워드

참고문헌

  1. Cassiani, G., Binley A. M., and T. P. A. Ferre, 2007, Unsaturated zone processes, Applied Hydrogeophysics, 71, 75-116.
  2. Constable, S., C., Parjer, R. L., and Constable, C. G., 1987, Occam's inversion: a practical algorithm for generating smooth models from EM sounding data, Geophysics, 52, 289-300. https://doi.org/10.1190/1.1442303
  3. de Franco, R., Biella, G., Tosi, L., Teatini, P., Lozej, A., Chiozzotto, B., Giada, M., Rizzetto, F., Claude, C., Mayer, A., Bassan, V., Gasparetto-Stori, G., December 2009. Monitoring the saltwater intrusion by time lapse electrical resistivity tomography, The Chioggia test site (Venice Lagoon, Italy). Journal of Applied Geophysics, Volume 69 (Issues 3-4), 117-130. https://doi.org/10.1016/j.jappgeo.2009.08.004
  4. Golden Software Inc., 2013, Surface Mapping System, Surfer Version 11.0.642, Golden Software Inc, Golden Colorado 80401-1866.
  5. Kim, J.-H., and Yi, M. J., 2006, 4-D Inversion of Geophysical Data Acquired over Dynamically Changing Subsurface Model, Conference by KSEG and KGES, 188-193.
  6. Kim, J.-H., Myeong-Jong, Yi., Sam-Gyu, Park, and Jae Gon, Kim, 2009, 4-D inversion of DC resistivity monitoring data acquired over a dynamically changing earth model. Journal of Applied Geophysics, 68, 522-532. https://doi.org/10.1016/j.jappgeo.2009.03.002
  7. Kim, K. J., Cho, I. K., and Chung, J. H., 2008, Time-lapse Inversion of 2D Resistivity Monitoring Data, Geophysics and Geophysical Exploration, 11, 326-334.
  8. Kemna, A., Binley, A. M., Ramirez, A., and Daily, W., 2000, Complex resistivity tomography for environmental applications, Chemical Engineering Journal, 77, 11-18. https://doi.org/10.1016/S1385-8947(99)00135-7
  9. LaBrecque, D. J., and Yang, X., 2001, Difference inversion of ERT data, A fast inversion method for 3-D in-situ monitoring, Journal of Environmental and Engineering Geophysics, 6, 83-89. https://doi.org/10.4133/JEEG6.2.83
  10. Leroux, V., and Dahlin, T., 2006, Time-lapse resistivity investigations for imaging saltwater transport in glaciofluvial deposits, Environmental Geology, 49, 347-358. https://doi.org/10.1007/s00254-005-0070-7
  11. Loke, M. H., 1999, Time-lapse resistivity imaging inversions, Environmental and Engineering Geophysical Society European Section, Meeting, Proceedings, Em1.
  12. Miller, C. R., Routh, P. S., Brosten, T. R., and Mcnamara, J. P., 2008, Application of time-lapse ERT imaging to watershed characterization, Geophysics, 73, G7-G17. https://doi.org/10.1190/1.2907156
  13. Karaoulis, M., Revil, A., Tsourlos, P., Werkema, D. D., and Minsley, B. J. 2013, IP4DI: A software for time-lapse 2D/3D DC-resistivity and induced polarization tomography, Computers and Geosciences, 54, 164-170. https://doi.org/10.1016/j.cageo.2013.01.008
  14. Ogilvy, R. D., Kuras, O., Meldrum, P. I., Wilkinson, P. B., Chambers, J. E., Sen, M., Gisbert, J., Jorreto, S., Frances, I., Pulido Bosch, A., and Tsourlos, P., 2009, Automated time-Lapse Electrical Resistivity Tomography (ALERT) for monitoring coastal aquifers, Near Surface Geophysics issue Vol 7, 367-375 Special issue on hydrogeophysics.
  15. Oldenborger, G. A., Knoll, M. D., Routh, P. S., and Labrecque, D. J., 2007, Time-lapse ERT monitoring of an injection/withdrawal experiment in a shallow unconfined aquifer, Geophysics, 72, F177-F187. https://doi.org/10.1190/1.2734365
  16. Tsourlos, et al., 2008. ERT Monitoring of Recycled Water Injection in a Confined Acquirer, 21st SAGEEP, Philadelphia, USA.
  17. Yi, M. J., Kim, J.-H., and Chung, S. H., 2003, Enhancing the resolving power of least-squares inversion with active constraint balancing, Geophysics, 68, 931-941. https://doi.org/10.1190/1.1581045