1 Department of Civil Engineering, Technical University of Denmark2 Section for Geotechnics and Geology, Department of Civil Engineering, Technical University of Denmark3 Technical University of Denmark
With the presently observed trend of permafrost warming and degradation, the development and availability of effective tools to locate and map ice-rich soils and massive ground ice is of increasing importance. This paper presents a geophysical study of an area with polygonal landforms in order to test the applicability of DC electrical resistivity tomography (ERT) and Ground Penetrating Radar (GPR) to identifying and mapping ice-wedge occurrences. The site is located in Central West Greenland, and the ice-wedges are found in a permafrozen peat soil with an active layer of about 30 cm. ERT and GPR measurements give a coherent interpretation of possible ice-wedge locations, and active layer probing show a tendency for larger thaw depth in the major trench systems consistent with a significant temperature (at 10 cm depth) increase in these trenches identified by thermal profiling. Three shallow boreholes were drilled during the campaign but did not encounter ice-wedges. As the final interpretation did not predict ice-wedge occurrence at the borehole locations, results not contradictive – but more data is needed for final validation.
Cold Regions Engineering 2012: Sustainable Infrastructure Development in a Changing Cold Environment, 2012, p. 634-643