Morphology and geotechnique of active-layer detachment failures in discontinuous and continuous permafrost, northern Canada

Auteurs :
LEWKOWICZ, A.G.
HARRIS, C.

Description :
Fifty active-layer detachment failures triggered after forest fire in the discontinuous permafrost zone (central Mackenzie Valley) are compared to several hundred others caused by summer meteorological triggers in continuous permafrost (Fosheim Peninsula, Ellesmere Island). Most failures fall into compact or elongated morphological categories. The location of the shear planes or zones in relation to the permafrost table and the degree of post-failure secondary movements (including headwall recession and thermokarst development within the failure track) differed between the localities, reflecting dissimilarity in the environmental triggers and in the degree of ground thermal disturbance.


Type de document :
Article de périodique

Source :
Geomorphology (Amsterdam), issn : 0169-555X, 2005, vol. 69, n°. 1-4, p. 275-297, nombre de pages : 23, Collation : Illustration, Références bibliographiques : 50 ref.

Date :
2005

Editeur :
Pays édition : Pays-Bas, Amsterdam, Elsevier