1887

Abstract

Summary

PVC membranes are used as groundwater barriers in infrastructure works in situations with high groundwater levels. When reconstruction works are necessary, the position of the membrane in the subsurface needs to be known. Deltares developed a method based on Electrical Resistivity Tomography (ERT) using the high electrical resistivity of the PVC membrane. Modelling showed that the PVC membrane has a profound effect on the electrical field lines. Classical ERT employed from the surface does not have sufficient spatial resolution to locate the membrane. Electrodes need to be closely spaced and within ca. 1.5 m from the membrane. To this end, a prototype tool was developed that can be pushed in the ground and measure while approaching the membrane. This prototype was tested in the laboratory. Measurements at different distances from the membrane showed that the tool can detect the distortion of field lines. Inversion was used to pinpoint the position of the membrane within 10 cm. The next step is to develop a tool that can be used in the field.

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/content/papers/10.3997/2214-4609.201902537
2019-09-08
2024-03-29
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References

  1. Binley, A., Daily, W., Ramirez, A.
    [1997] Detecting leaks from environmental barriers using electrical current imaging.J Environ Eng Geophys2(1),11–19, https://doi.org/10.4133/JEEG2.1.11
    [Google Scholar]
  2. Revil, A., M.Karaoulis, T.Johnson, A.Kemna
    [2012]. Review: Some low-frequency electrical methods for subsurface characterization and monitoring in hydrogeology.Hydrogeology Journal20, 617–658, https://doi.org/10.1007/s10040-011-0819-x
    [Google Scholar]
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