Conference paper
Surface Geophysical Measurements for Locating and Mapping Ice-Wedges
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.
Language: | English |
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Publisher: | American Society of Civil Engineers |
Year: | 2012 |
Pages: | 634-643 |
Proceedings: | Fifteenth International Specialty Conference on Cold Regions Engineering |
Journal subtitle: | Sustainable Infrastructure Development in a Changing Cold Environment |
ISBN: | 0784412472 , 0784477124 , 1628704497 , 9780784412473 , 9780784477120 and 9781628704495 |
Types: | Conference paper |
DOI: | 10.1061/9780784412473.063 |
ORCIDs: | Ingeman-Nielsen, Thomas and Tomaskovicova, Sonia |