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TitleShoreline permafrost along the Mackenzie River
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AuthorDyke, L D
SourceThe physical environment of the Mackenzie Valley, Northwest Territories: a base line for the assessment of environmental change; by Dyke, L D (ed.); Brooks, G R (ed.); Geological Survey of Canada, Bulletin 547, 2000 p. 143-151; 1 CD-ROM, (Open Access)
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PublisherNatural Resources Canada
Mediapaper; CD-ROM; digital; on-line
RelatedThis publication is contained in Dyke, L D; Brooks, G R; (2000). The physical environment of the Mackenzie Valley, Northwest Territories: a base line for the assessment of environmental change, Geological Survey of Canada, Bulletin no. 547
File formatbmp; pdf (Adobe Acrobat Reader v.6.0 is included / est fourni); txt; pdf
ProvinceNorthwest Territories
NTS85D; 85E; 95A; 95B; 95G; 95H; 95I; 95J; 95K; 95N; 95O; 96C; 96D; 96E; 96F; 106G; 106H; 106I; 106J; 106K; 106L; 106M; 106N; 106O; 106P; 107B; 107C
AreaMackenzie Valley
Lat/Long WENS-136.0000 -118.0000 70.0000 60.0000
Subjectssedimentology; surficial geology/geomorphology; ground ice; ground temperatures; thermal regimes; permafrost; terrain types; shorelines; vegetation; water temperature; erosion; sedimentation; channels; thickness; freeze-thaw cycles; forests; Quaternary
Illustrationssketch maps; schematic diagrams; cross-sections; profiles
Released2000 12 01
AbstractShorelines mark one of the most abrupt changes in ground temperature in permafrost regions. The ground temperature in the vicinity of shorelines is controlled by the contrast in mean annual temperature between the particular water body and the adjacent land. Erosion or sedimentation along shorelines complicates ground temperatures by moving the boundary between relatively cold land and warmer water. A river channel migrating due to erosion on the outside of a bend introduces the relatively warm water condition to frozen ground, causing thaw to begin. At the same time, sediment is deposited on the opposite shore as the migration progresses. This results in ground temperatures again being determined directly by air temperature. Depending on water temperature and shoreline vegetation, temperature contrasts can range from about 4°C to over 10°C.