Geosciences Journal

The Association of Korean Geoscience Societies (한국지질과학협의회)
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Validation of a new magnetometric survey for mapping 3D subsurface leakage paths

  • Park, DongSoon (K-water Convergence Research Institute) ;
  • Jessop, Mike L. (Willowstick Technologies)
  • Received : 2018.04.11
  • Accepted : 2018.09.22
  • Published : 2018.12.01
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Abstract

Techniques for more reliable detection of 3D subsurface flow paths are highly important for most water-related geotechnical projects. In this case study, a magnetometric resistivity method with a new approach and state-of-the-art technology ("Willowstick survey") was applied to the testbed dam (YD dam) site, and its applicability was validated by geotechnical investigation techniques including borehole drilling and sampling, Lugeon test, flow direction and velocity test, and seismic tomography. In addition to the magnetometric survey, a 3D electrical resistivity survey was performed independently and the results were compared and discussed. The electrical resistivity survey was effective in detecting groundwater levels, but it was limited in mapping leakage paths. On the other hand, the Willowstick magnetometric survey effectively detected geologic weaknesses (e.g., fault fracture) and potential leakage paths of the dam site foundation rocks. The results of this research are expected to be effective for water infrastructures where leakage is an important issue.

Keywords

Acknowledgement

Grant : A study on the integrity assessment of ageing dams for dam performance improvement

Supported by : K-water

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