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TitreEstimating the extent of near-surface permafrost using remote sensing, Mackenzie Delta, Northwest Territories
AuteurNguyen, T -N; Burn, C R; King, D J; Smith, S L
SourcePermafrost and Periglacial Processes vol. 20, 2009 p. 141-153, https://doi.org/10.1002/ppp.637 (Accès ouvert)
Année2009
Séries alt.Secteur des sciences de la Terre, Contribution externe 20070573
ÉditeurWiley-Blackwell
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1002/ppp.637
Mediapapier; en ligne; numérique
Formatspdf
ProvinceTerritoires du Nord-Ouest
SNRC106M/07; 106M/08; 106M/09; 106M/10; 106M/14; 106M/15; 106M/16; 107B/03; 107B/04; 107B/05; 107B/06; 107B/11; 107B/12; 107B/13; 107B/14; 107C/03; 107C/04
Lat/Long OENS-137.0000 -133.5000 69.5000 67.2500
Sujetspergélisol; glace fossile; congélation du sol; télédétection; végétation; sensitivité de terrain; analyse de terrains; géologie des dépôts meubles/géomorphologie; géophysique
Illustrationslocation maps; photographs; tables; flow charts; aerial photographs
ProgrammeSécurité de l'approvisionnement énergétique du Canada
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
Résumé(disponible en anglais seulement)
The extent of near-surface permafrost, or perennially frozen ground within 3m of the surface, was estimated for the Mackenzie River delta by determining its association with riparian vegetation communities in the field, and by subsequently mapping these vegetation communities using SPOT-5 data and the supervised maximum-likelihood classification technique. Near-surface permafrost was absent beneath willow - horsetail (Salix-Equisetum) vegetation communities on point bars and alluvial islands throughout the delta and beneath horsetail (Equisetum) communities in the southern and central delta. Near-surface permafrost was found beneath all other vegetation communities and land surface types. Multispectral SPOT-5 data were classified with overall accuracies greater than 80 per cent. Using the remotely sensed vegetation community data, near-surface permafrost was estimated to occur beneath 93 per cent, 95 per cent and 96 per cent of the land surface within the investigation areas of the southern, central and northern delta, respectively. In contrast to the most recent Permafrost Map of Canada, these results indicate that the Mackenzie Delta is part of the continuous permafrost zone.
GEOSCAN ID224851