Frost weathering : recent advances and future directions

Recent adavances in permafrost and periglacial research. Special issue

Auteurs :
MATSUOKA, N.
MURTON, J.
LEWKOWICZ, A.G.

Description :
This paper reviews frost-weathering studies in the last five years and proposes key questions to be answered. Field monitoring has highlighted the roles of diurnal and annual frost cycles in controlling the timing and magnitude of frost weathering. In the laboratory, bidirectional freezing in soft, porous rocks has produced fractures containing segregated ice layers near the permafrost table, which imply the development of ice-filled fractures in permafrost bedrock over long time-scales. This finding, combined with numerical modelling of the thermal regime in permafrost rock slopes, contributes to the prediction of large-scale rockfalls and rock avalanches triggered by permafrost degradation.


Type de document :
Congrès

Source :
International Conference on permafrost, 9, Fairbanks, Etats-Unis, 2008-06-29, Permafrost and periglacial processes, issn : 1045-6740, 2008, vol. 19, n°. 2, p. 195-210, nombre de pages : 16, Collation : Illustration, Références bibliographiques : 3 p.

Date :
2008

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley