Ground Penetrating Radar (GPR)

DMT has extensive experience using GPR as part of an integrated solution to solve a variety of technical challenges:

Applications

  • Muskeg mapping
  • Archaeological studies including historic grave locating, graveyard evaluations
  • Water table mapping
  • Alluvial channel and paleo-channel investigation
  • Lithologic mapping
  • Utility/foundation mapping
  • Underground storage tank (UST) locating
  • Sediments beneath rivers and lakes
GPR systems use electromagnetic pulses to create cross-sectional images of the subsurface. These images, called radargrams, can provide valuable information about sedimentary structure, lithologic boundaries and other targets which cannot be obtained through other methods.

GPR data can be collected over land, water, ice or snow. The system can by towed behind an ATV or snow mobile in order to efficiently collect data over large areas.

GPR can be a challenging technique to use correctly, both because of its sensitivity to the conductivity of the ground and because the data itself are notoriously difficult to interpret. DMT has the expertise to advise clients on the applicability of GPR in different environments. In order to combat interpretation difficulties, DMT uses advanced processing techniques including migration to enhance textures in the radargram and extract the maximum information possible.

Even with advanced processing, however, ground truthing of radar data to correlate reflections with lithologic changes is always required. In fact, DMT usually recommends GPR be collected as an adjunct to other geophysical methods such as refraction seismic or capacitively coupled resistivity methods (Ohmmapper). In this way, GPR is often used very effectively by DMT as part of our integrated geo-modelling approach to geophysics, in which multiple geophysical methods and available geologic information are combined to provide the best possible interpretation.

For information on how GPR can be used to help you in your project, please contact us.