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TitleDisequilibrium permafrost conditions on NWT Highway 3
AuthorWolfe, S A; Morse, P D; Hoeve, T E; Sladen, W E; Kokelj, S V; Arenson, L U
SourceProceedings of GeoQuebec 2015, 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference; 2015 p. 1-8
Year2015
Alt SeriesEarth Sciences Sector, Contribution Series 20150103
MeetingGeoQuébec2015, 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference; Québec; CA; September 20-23, 2015
Documentbook
Lang.English
Mediadigital
File formatpdf
ProvinceNorthwest Territories
NTS85J; 85K
AreaBehchoko; Yellowknife; Great Slave Lake
Lat/Long WENS-118.0000 -114.0000 63.0000 62.0000
Lat/Long WENS-118.0000 -114.0000 63.0000 62.0000
Subjectssurficial geology/geomorphology; stratigraphy; sedimentology; environmental geology; engineering geology; geophysics; Nature and Environment; Science and Technology; Transport; permafrost; ground ice; thermal analyses; thermal regimes; ground temperatures; peatlands; sediment stability; geophysical logging; strain analysis; grain size analyses; Great Slave Lowlands; glaciolacustrine sediments; infrastructures; road construction; road networks; permafrost thaw; climate change; anthropogenic impacts; cumulative effects
Illustrationslocation maps; geoscientific sketch maps; tables; profiles; geophysical logs; time series; bar graphs; ternary diagrams; plots
ProgramClimate Change Geoscience, Land-based Infrastructure
AbstractThe thermal and physical states of permafrost in natural and developed settings along NWT Highway 3 are examined and implications of recent realignment between Behchoko and Yellowknife are discussed. Permafrost occurs in natural terrain beneath peatlands and forested fine-grained (glacio) lacustrine sediments. Natural and developed sites indicate surface warming especially beneath the highway embankment, which was straightened and reconstructed between 1999 and 2006. Fine-grained sediments are thaw-sensitive and ice-rich. The terrain could experience up to 1.3 m of settlement with thawing of the top 5 m of permafrost. Permafrost had aggraded into the old highway embankment comprised of fine-grained materials, but is unlikely to be sustained beneath the new highway embankment comprised primarily of blast rock.
Summary(Plain Language Summary, not published)
The thermal and physical states of permafrost in natural and developed settings along NWT Highway 3 are examined and implications of recent realignment between Behchoko and Yellowknife are discussed. Permafrost occurs in natural terrain beneath peatlands and forested fine-grained (glacio) lacustrine sediments. Natural and developed sites indicate surface warming, especially beneath the highway embankment that was straightened and reconstructed between 1999 and 2006. Fine-grained sediments are thaw-sensitive and ice-rich. The terrain could experience up to 1.3 m of settlement if the top 5 m of permafrost were to thaw. Permafrost had aggraded into the old highway embankment comprised of fine-grained materials, though it is unlikely to be sustained beneath the updated highway embankment comprised primarily of blast rock.
GEOSCAN ID296659