CGRG Bibliography of Canadian Geomorphology
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Author : Buteau, S.; Fortier, R.; and Allard, M.
Date : 2010.
Title : Permafrost weakening as a potential impact of climatic warming.
Publication : Journal of Cold Regions Engineering
Issue : 24(1):
Page(s) : 1-18.
Abstract
The warming weakening of permafrost strength as a result of different scenarios of climatic warming ranging from 0 to 5°C over the next century has been predicted using a one-dimensional geothermal model. These predictions are based on the results of an intensive geotechnical program carried out in a warm ice-rich silty permafrost in Northern Quebec. The dependency of permafrost strength on temperature was assessed from cone penetration tests performed at regular intervals over a 2-month period during the seasonal warming of the upper permafrost layer in spring 2000. A thermomechanical subroutine taking into account this dependency has been then added to the one-dimensional geothermal model for the simulation of the weakening of permafrost strength as it warms. A warming rate of 0.02°C/year over the next century leads on a slow decrease in permafrost strength corresponding to a relative loss of strength of about 50%. For a warming rate of 0.05°C/year, the strength weakening is much more pronounced and almost reaches the unfrozen state at the end of the warming period corresponding to a relative loss of 98%.
Bibliography of Canadian Geomorphology