Ground-penetrating radar instruments for high-resolution 3D imaging of the shallow subsurface

Alexandre Novo

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Instrumentation I

ABSTRACT: Geoscientists, engineers and archeologists need clear images of the shallow subsurface in order to detect and map underground features. Ground-penetrating radar (GPR) imaging can noninvasively provide images of the shallow subsurface. Therefore, GPR has been one of the most utilized geophysical tools for engineering and archaeological prospection in the last two decades. However, the lack of a robust data acquisition methodology produced images of poor quality in many cases and this has significantly limited the use of the technology. During the last few years, Ingegneria Dei Sistemi (IDS) has developed modular multichannel 3D GPR array systems which have greatly improved the speed and areal coverage of the ground. As well, these instruments provide precise images of the subsurface targets. This makes 3D GPR imaging a valuable tool for geotechnical engineering. Here we present an approach for fast and accurate utility mapping as an example of forthcoming subsurface utility engineering using GPR. Results from an ongoing pilot project at the city of Montreal is presented as study case.

RÉSUMÉ: Géo scientifiques, les ingénieurs et les archéologues ont besoin d'images claires de la couche souterraine afin de des images de la couche souterraine. Par conséquent, le Géoradar a été l'un des outils les plus utilisés dans la géophysique pour l'ingénierie et la prospection archéologique dans les deux dernières décennies. Toutefois, l'absence d'une méthodologie d'acquisition de données robuste produit des images de qualité médiocre dans de nombreux cas, ce qui a considérablement limité l'utilisation de la technologie. Au cours des dernières années, Ingegneria Dei Sistemi (IDS) a développé des réseaux de systèmes de Géoradars 3D modulaires multicoutil précieux pour la géotechnique. Ici, nous présentons une approche pour la cartographie rapide et précis de la souterrains utilisant le Géoradar. Résultats d'un projet pilote en cours dans la ville de Montréal est présenté comme étude de cas.

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