Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Experiments on the GPR Reposnse of the Organic Hydrocarbons

유류오염물질의 GPR 반응에 대한 모델 실험 연구

  • Published : 2004.04.01
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Abstract

A physical model experiment was conducted using a sand and gravel-filled tank model, to investigate the influence on the GPR response of LNAPL vapor phase effects in the unsaturated zone and of residual phase of LNAPL trapped in the saturated zone. Background measurements of GPR were made with only water in the tank using a fluctuating water table model. Gasoline was, then, injected into the bottom of the model tank to simulate a subsurface discharge from a leaking pipe or tank at depth, obtaining GPR data with rising and lowering of water table. Results from the experiment show the GPR sensitivity to the changes in the moisture content in the vadose zone and its effectiveness for monitoring minor fluctuation of the water table. The results also demonstrate a potential of GPR for monitoring possible vapor phase effects of volatile hydrocarbons in the vadose zone as a function of time, and for detecting the effects of residual phase of hydrocarbons in the water saturated system. In addition, the results provide the basis for a strategy that has the potential to successfully detect and delineate residual LNAPL contamination in the water-saturated system at field sites where the conditions are similar to those simulated in the physcial models described herein.

휘발유와 같은 유기탄화수소계 오염 물질인 유류가 지하 분포 시, 불포화대에 분포하는 가스상(또는 증기상)유류와 지하수 포화대에 포획되어있는 잔류상 유류 오염 물질이 GPR(Ground Penetrating Radar)에 미치는 반응을 조사하기 위하여 모델 실험을 수행하였다. 모델 실험에는 모래와 자갈을 토양 매질로서 채운 탱크를 이용하였고, 유류 수송을 위한 매설 파이프 또는 지하 유류저장탱크로부터 유류의 누출을 모사하기 위하여 모델 탱크 바닥으로부터 물과 휘발유를 주입 또는 배출하여 지하수면의 상승과 하강을 유도하면서 다양한 상의 LNAPL지하분포를 모사하여 GPR 측정을 실시하였다. 본 연구 결과, 불포화대에서 매질의 수분함량 증가에 따른 레이다 파의 속도 감소를 보이는 민감한 GPR 반응이 관측되었으며, 지하수면의 상승과 하강에 따른 지하수면 위치 변화 관측에 있어서 GPR의 유용성이 입증되었다. 본 연구에서 모관대를 형성하고 있는 매질의 대수층에서는 실제 지하수면 대신 모관대의 상부가 지구물리학적 지하수면으로 탐지되었다. 또한 휘발유 주입 이후 형성된 불포화대내 가스상 LNAPL은 매질의 전기적 성질의 변화를 유도하여 레이다 파의 감쇠를 야기하는 GPR 반응을 나타내었다. 포화대 내의 잔류상 LNAPL에 대한 GPR 반응은 레이다 파의 매질내 속도 및 에너지 투과성을 향상시킴으로써 지하수면 상승으로 포화대에 포획된 잔류상 유류오염물질를 포함하는 대수층 지역의 탐지 가능성을 보여 주었다. 이는 유류오염물질이 지하수면 아래의 포화대에 잔류상의 형태로 분포하는 오염지역에서 GPR를 이용하여 유류오염지역을 탐지할 수 있는 새로운 탐사전략의 근거를 제공한다.

Keywords

References

  1. Society of Exploration Geophysicists(Expanded Abstracts), E/G1.4 Water Table Detection with Ground Penetrating Radar: 61st Annual International Meeting Annan,A.P.;Cosway,S.W.;Redman,J.D.
  2. Proc. of the 5th International conference on Ground Penetrating Radar v.1 Radar Detection of Thin Layers of Hydrocarbon Contamination Barber,W.B.;Morey,R.
  3. Journal of Applied Geophysics v.33 Applications of Ground Penetrating Radar in Assessing some Geological Hazards: Examples of Groundwater Contamination, Faults, Cavities Benson,A.K. https://doi.org/10.1016/0926-9851(95)90040-3
  4. Ground Water v.29 no.3 Application of Ground-Penetrating-Radar Methods in Hydrogeologic Studies Beres,M.Jr.;Haeni,F.P. https://doi.org/10.1111/j.1745-6584.1991.tb00528.x
  5. Proc. of the Symposium on the Application of Geophysics to Engineering and Environmental Problems Monitoring of Controlled LNAPL Spill Using Ground-Penetrating Radar Campbell,D.L.;Lucius,J.E.;Ellefsen,K.J.;Deszcz-Pan,M.
  6. Proc. of the Symposium on the Application of Geophysics to Engineering and Environmental Problems Site Studies of Ground Penetrating Radar for Monitoring Petroleum Product Contaminants Daniels,J.J.;Roberts,R.;Vendl,M.A.
  7. Journal of Applied Geophysics v.33 Ground Penetrating Radar for the Detection of Liquid Contaminants Daniels,J.J.;Roberts,R.;Vendl,M.A. https://doi.org/10.1016/0926-9851(95)90041-1
  8. Geophysical Prospecting v.37 Ground-Penetrating Radar for High-Resolution Mapping of Soil and Rock Stratigraphy Davis,J.L.;Annan,A.P. https://doi.org/10.1111/j.1365-2478.1989.tb02221.x
  9. Proc. of the Symposium on the Application of Geophysics to Engineering and Environmental Problems Geophysical Monitoring of a Controlled Kerosene Spill DeRyck,S.M.;Redman;J.D.;Annan,A.P.
  10. USEPA Contact No. 68-03-3409 A Study to determine the Feasibility of Using A Ground Penetrating Radar for More Effective Remediation of Subsurface Contamination Douglas,D.G.;Burns,A.A.;Rino,C.L.;Maresca,J.W.
  11. Contaminant Hydrogeology Fetter,C.W.
  12. Geophysics v.61 no.3 Velocity Variations and Water Content Estimated from Multi-Offset, Ground-Penetrating Radar Greaves,R.J.;Lesmes,D.P.;Lee,J.M.;Toksoz,M.N. https://doi.org/10.1190/1.1443996
  13. Journal of Environmental and Engineering Geophysics v.0 no.1 Experiments on the Detection of Organic Contaminants in the Vadose Zone Grumman,D.J.;Daniels,J.J.
  14. Ph.D. Thesis, The Dept. of Geological Sciences, The Ohio State University A Physical Model Experiment on the Hydrogeologic Application of GPR Kim,C.
  15. Proc. of the Symposium on the Application of Geophysics to Environmental and Engineering Problems Detectability of Crude Oil in the Subsurface near Bemidji, Minnesota, Using Ground Penerating Radar Lucius,J.E.
  16. Proc. of the Symposium on the Application of Geophysics to Engineering and Environmental Problems Detection and Mapping of an LNAPL Plume Using GPR: A case Study Maxwell,M.;Schmock,J.
  17. Journal of Contaminant Hydrogeology v.6 A Review of Immiscible Fluids in the Subsurface: Properties, Models, Characterization and Remediation Mercer,J.W.;Cohen,R.M. https://doi.org/10.1016/0169-7722(90)90043-G
  18. Proc. of the Symposium on the Application of Geophysics to Engineering and Environmental Problems Geophysical Investigation of Anomalous Conductivity at a Hydrocarbon Contaminated Site Nash,M.S.;Atekwana,E.;Sauck,W.A.
  19. Proc. of the NWWA/API Conference on Petroleum Hydrocarbons and Organic Chemicals in Ground Water Prevention, Detection and Restoration Direct Detection of Hydrocarbon and Organic Chemicals with Ground Penetrating Radar and Complex Resistivity Olhoeft,G.R.
  20. Proc. of the IEEE v.82 no.12 Ground Penetrating Radar as a Subsurface Environmental Sensing Tool Peters,L.Jr.;Daniels,J.J.;Young,J.D. https://doi.org/10.1109/5.338072
  21. First Break v.12 no.8 Georadar for Hydrogeology van Overmeeren,R.A.
  22. Proc. of the NWWA/API Conference on Petroleum Hydrocarbons and Organic Chemicals in Ground Water Prevention, Detection and Restoration Is Physical displacement of Residual Hydrocarbons a Realistic Possibility in Aquifer Restoration? Wilson,J.L.;Conrad,S.H.