Mapping sedimentation features in an alluvial valley

Sediments of the Rhone river are characterized by strong heterogeneity between clay, sand and gravel units. To map these units, we employed an electromagnetic instrument (DualEM421). This instrument das the advantage that no contact to the ground is required and it can be carried on foot.

With the interpreted data it was possible to map different geologic units to a depth of up to 4.5m.

3D inversions of EM data allow for accurate mapping of terrain conductivity on the top 6 meters below ground level

Location Switzerland
Instrument DualEM 421
Positioning DGPS
Geometry Continuous measures
Area 10 hectares
Personnel 2 people
Duration 1 day