GROUND PENETRATING RADAR SERVICES
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How Does Ground Penetrating Radar Work?
GPR offers an accurate, non-destructive, non-invasive solution to mapping the Earth’s shallow subsurface. GPR methods measure the changes in the propagation of radar energy in the ground to produce a high-resolution image of the shallow subsurface conditions. GPR uses high-frequency electromagnetic (radar) energy to acquire subsurface information. A GPR system comprises a control unit, a transmitting and receiving antenna, and a power supply. The transmitting antenna emits radar energy downward into the ground. The radar energy is reflected back to a receiving antenna when the electrical properties of the subsurface change. The reflected signals are recorded to produce a continuous image of the shallow subsurface conditions, which can be viewed in real-time. The antennas are mounted on a cart that is pulled or pushed by hand or vehicle. GPR data is collected digitally and processed to produce high-resolution 2D and 3D images of the subsurface, typically within the upper 20 feet; however, deeper depths are reachable under ideal ground conditions. Cordillera Geo-Services operates GPR hardware and software on a variety of engineering and environmental applications.
GPR Applications Include:
Geological problems
Caves, voids, and sinkhole detection
Subsidence, cavity, and karst mapping
Bedrock profiling
Shallow geological mapping
Locating fractures, faults, and other shallow subsurface structures
Archeological and Forensic problems
Archaeological investigations
Excavation planning
Unmarked grave locations
New cemetery plot layouts
Geoarchaeological surveys
Geomorphic investigations
Forensic evidence locating
Engineering problems
Drainage tiles mapping
Clandestine tunnel detection
- Subsurface Utility Engineering (SUE) applications:
- Locating water lines
- Metallic and non-metallic utility mapping
- Construction applications:
- Location of buried foundations and basements
- Void detection
- Locating beams
- Bridge deck surveys
- Floor surveys
- Concrete applications:
- Concrete slab scanning and imaging
- Measure slab thickness
- Find rebar, post-tension cables, conduits, and non-metallic objects
- Void detection
- Clearing of boring locations
Environmental problems
Site assessment
Landfill, waste pits, and trenches delineation
Shallow water table mapping
Mapping groundwater pollution
Locating Underground Storage Tanks (UST) and drums
Mineral exploration problems
Mine safety
Rock quality mapping
Sand and gravel (aggregates) mapping