Hydrogeophysics

Sustainable water supply strategies require detailed insight into subsurface conditions. While drilling provides vertical 1D or 2D information about soil layers at highly specific locations, geophysical methods enable full 3D mapping of the subsurface between boreholes.

By applying hydrogeophysics, we deliver the comprehensive knowledge required for strategic water resources management – including groundwater aquifer mapping and assessment of saltwater intrusion risks. We utilise a wide range of innovative hydrogeophysical methods, such as:

tTEM: Efficient 3D mapping on land

The tTEM-system is a quadbike-towed, transient electromagnetic system, designed for detailed 3D hydrogeological mapping to a depth of 80-130 m in a fast and cost-efficient way. The detailed 3D coverage is obtained by fast data repetition and a small line spacing of typically 25-50 m.

FloaTEM: Efficient 3D mapping on water bodies

FloaTEM is a transient electromagnetic method for data acquisition on water and is a further development of the land based tTEM system but with the system towed behind a boat. With dense survey lines a 3D coverage is obtained down to a depth of ~70-120 m. The method is ideal for both hydrogeological and geotechnical mapping on water, where boreholes are expensive and scarce.

sTEM: A flexible and ultra-portable solution

The sTEM system is an ultra-portable, compact system and lightweight carried by foot, making it ideal for areas that are normally not accessible by, e.g., quadbike. The system offers fast measurements and comes in both a profiler version, where multiple soundings to a depth of up to ~200 m can be made per day, as well as a larger loop version for even greater penetration depth.

SkyTEM: High-resolution deep sub-surface mapping

SkyTEM delivers market-leading sub-surface mapping from 1 to 800 meters in depth, optimised for groundwater management and mineral exploration. The SkyTEM Diamond system offers exceptionally near-surface exploration, covering depths from 1 to 200 meters, making it ideal for geotechnical, engineering, and environmental applications. All SkyTEM airborne systems operate in all-terrains with helicopters and drones, ensuring efficient and reliable data acquisition.

DualEM: High resolution near surface mapping

The DualEM provides a quadbike based towed, electromagnetic system with unmatched resolution in the upper 5-8 meters. Its high acquisition speed enables detailed 3D mapping that can provide essential data regarding, e.g., geotechnics, soil contamination, water infiltration/retention, and soil resistivity.

ERT: A proven method for identifying sub-surface water sources

The Electrical Resistivity Tomography technique (ERT) is a well-known geophysical method operated by two people on foot. The method is very robust when it comes to cultural noise, e.g. power lines, and the acquisition method enables usage in areas where other methods cannot be applied. Typical applications include geotechnics, soil resistivity (earthing/grounding), soil contamination, and natural resources.