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TitleTime-lapse electrical resistivity surveys and unfrozen water content in cold continuous permafrost
AuthorOldenborger, G A; LeBlanc, A M
Alt SeriesNatural Resources Canada, Contribution Series 20170022
PublisherEuropean association of Geoscientists and Engineers
Meeting23rd European Meeting of Environmental and Engineering Geophysics; Malmo; SE; September 3-7, 2017
Lang.English
Mediapaper
File formatpdf
ProvinceNunavut
NTS25N/10
AreaIqaluit
Lat/Long WENS -69.0000 -68.0000 63.9167 63.0000
Subjectspermafrost; modelling; thermal regimes; unfrozen water content; electrical resistivity surveys; active layer
Illustrationsgraphs; plots; location maps
ProgramLand-based Infrastructure, Climate Change Geoscience
LinksOnline - En ligne
AbstractEstimates of material properties such as ice content or unfrozen water content are critical for thermal modelling of the response of permafrost to climate forcing, understanding contaminant flow and transport, or for predicting the behaviour of permafrost as an engineering substrate. We utilize time-lapse electrical resistivity surveys to examine the potential for imaging relative changes in unfrozen water content for cold continuous permafrost in the Canadian Arctic. Electrical resistivity data were collected from 2012/08 to 2015/06 at semi-regular time intervals using a permanent electrode installation at Iqaluit International Airport in Nunavut, Canada. Using post-inversion model differencing, we observe significant changes in electrical resistivity and we infer changes in unfrozen moisture content that appear consistent with temperature records. The most prevalent changes occur below the active layer in the zone of significant temperature fluctuation.
Summary(Plain Language Summary, not published)
Estimates of material properties such as ice content or unfrozen water content are critical for thermal modelling of the response of permafrost to climate forcing, understanding contaminant flow and transport, or for predicting the behaviour of permafrost as an engineering substrate. We utilize time-lapse electrical resistivity surveys to examine the potential for imaging relative changes in unfrozen water content for cold continuous permafrost in the Canadian Arctic. Electrical resistivity data were collected from 2012/08 to 2015/06 at semi-regular time intervals using a permanent electrode installation at Iqaluit International Airport in Nunavut, Canada. Using post-inversion model differencing, we observe significant changes in electrical resistivity and we infer changes in unfrozen moisture content that appear consistent with temperature records. The most prevalent changes occur below the active layer in the zone of significant temperature fluctuation.
GEOSCAN ID300543