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Detailed Low-Induction-Number EM Sounding to 9-m Depth
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 24rd EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Apr 2011, cp-247-00029
Abstract
Low-induction-number electromagnetic instruments have been used widely since the 1980s to measure apparent conductivity of the near surface. in 2010, an instrument incorporating 6 rigidly mounted arrays between 2-m and 6-m in length was developed to provide 6 simultaneous soundings of apparent conductivity. the depth of exploration of the deepest-sounding array exceeds 9-m. Where there is conductive layering of sufficient contrast and continuity within this depth range, estimates of layer conductivity and thickness can be made from the simultaneous data. A profile of data was acquired across a previously mapped plume of leachate from a landfill at Canadian forces Base Borden. Estimates of vadose-zone conductivity, aquifer conductivity and aquifer depth derived from the EM data are in substantial agreement with well logs and samples.