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TitleElectrical and electromagnetic data for permafrost characterization at Iqaluit International Airport, Nunavut
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AuthorOldenborger, G A; LeBlanc, A -M; Sladen, W E
SourceGeological Survey of Canada, Open File 7750, 2015, 43 pages, https://doi.org/10.4095/295978
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNunavut
NTS25N/10; 25N/15
AreaIqaluit; Baffin Island
Lat/Long WENS-69.0000 -68.5000 64.0000 63.5000
Subjectsgeophysics; surficial geology/geomorphology; electrical surveys; electromagnetic mapping; electromagnetic induction; electromagnetic fields; e m surveys; remote sensing; satellite imagery; permafrost; freezing ground; ground ice; displacement; terrain analysis; terrain sensitivity; terrain types; D-InSAR; Cenozoic; Quaternary
Illustrationslocation maps; tables; aerial photographs; graphs; schematic diagrams
ProgramLand-based Infrastructure, Climate Change Geoscience
Released2015 02 24
AbstractIqaluit International Airport presently suffers from instabilities and subsidence along its runway, taxiways and apron. In particular, asphalt surfaces are significantly impacted by settlement and cracking These instabilities may be related to permafrost, permafrost degradation and associated drainage conditions. This Open File reports on electrical and electromagnetic geophysical data collected and processed by the Geological Survey of Canada at the Iqaluit International Airport as part of the Land-Based Infrastructure Project within the Climate Change Geoscience Program. Galvanic and capacitive electrical resistivity surveys, along with low induction number electromagnetic measurements, were performed over selected areas within the airport boundary and in the near vicinity to assist with permafrost characterization and to investigate active permafrost processes. The recovered electrical resistivities suggest distinct electrical signatures for different terrain units and sediment types, and for ice-rich material including ice wedges. Even with continuous permafrost and cold permafrost temperatures, the resistivity models reveal anomalously conductive material at depth that is not obviously correlated to mapped surficial sediments. The anomalous regions are correlated with localized settlement problems and downward multi-season displacement derived from D-InSAR. The geophysical surveys also exhibit features indicative of seasonal freezing of localized groundwater beneath airport infrastructure and variable active layer thickness under infrastructure that is thicker than for undeveloped ground.
Summary(Plain Language Summary, not published)
Iqaluit International Airport presently suffers from instabilities and subsidence along its runway, taxiways and apron. These instabilities may be related to permafrost, permafrost degradation and associated drainage conditions. In particular, asphalt surfaces are significantly impacted by permafrost degradation, thaw settlement and frost cracking. As part of the Climate Change Geoscience Program, several types of geophysical data have been collected over and around airport infrastructure to characterize permafrost conditions and to investigate active permafrost processes. The geophysical surveys reveal anomalies related to multi-season displacement and groundwater influence.
GEOSCAN ID295978