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TitreElectrical resistivity surveys for permafrost terrain characterization along the Highway 3 corridor, Yellowknife, Northwest Territories
AuteurOldenborger, G A
SourceCommission géologique du Canada, Dossier public 7062, 2012, 39 pages; 1 CD-ROM,
Documentdossier public
MediaCD-ROM; en ligne; numérique
Formatspdf; rtf; shp; txt
ProvinceTerritoires du Nord-Ouest
SNRC85J/07; 85J/10; 85J/11
Lat/Long OENS-115.5000 -114.5000 62.7500 62.2500
Sujetspergélisol; congélation du sol; glace fossile; températures au sol; climat; climat arctique; fluctuations climatiques; regimes thermiques; analyses thermiques; neige; précipitation; résistivité électrique; interprétations géophysiques; levés géophysiques; sensitivité de terrain; analyse de terrains; Changement climatique; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique
Illustrationslocation maps; photographs; aerial photographs; schematic diagrams; profiles
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
Bibliothèque de Ressources naturelles Canada - Calgary (Sciences de la Terre)
Bibliothèque de Ressources naturelles Canada - Vancouver (Sciences de la Terre)
Commission géologique du Canada (Atlantique)
Bibliothèque de Ressources naturelles Canada - Québec (Sciences de la Terre)
ProgrammeRenforcement de la résilience des communautées canadiennes face aux changements climatiques, Géosciences de changements climatiques
Diffusé2012 04 19
Résumé(disponible en anglais seulement)
This open file reports on recent geophysical data collected and processed by the Geological Survey of Canada as part of the Great Slave Transportation Risk in the Arctic to Climatic Sensitivity activity within the Climate Change Geoscience Program. In late August of 2011, electrical resistivity surveys were performed at selected sites along the Highway 3 corridor, west of Yellowknife. Highway 3 presently suffers from road instabilities including settlement, heave and rotations related to transitions between differing terrain and drainage conditions within discontinuous permafrost. Electrical resistivity data were collected over identified terrain types, and across potential terrain transitions and thaw fronts based on the hypothesis that permafrost distribution and conditions vary with terrain type. Processed resistivity models suggest distinct electrical signatures for most of the terrain types which would allow for extensive geophysical characterization complimentary to landscape mapping, temperature data and shallow boreholes. The resistivity models also exhibit features indicative of the base of ice-bonded permafrost, ice-rich sediment and thaw zones, which can be correlated with terrain features. Observed resistivity anomalies indicate thaw zones related to existing and past road infrastructure, which may help in understanding conditions causing highway subsidence.