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Simulation of soil-water and heat flow equation to predict the evolution of discontinuous permafrost in northern Québec

Khaled Ben-Miloud
Maurice K. Seguin
KB

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Khaled Ben-Miloud

Résumé du colloque

The hydrological basin is located SE of Ungava Bay. The deposits are of glacial, fluvio glacial and marine origin. Permafrost is discontinuous. Two test sites on cryogenic mounds are instrumented to gather hydrological and thermal parameters. The objectives of this study are two-fold: 1) to investigate the importance of the heat convection mode using numerical models of heat conduction and combined heat conduction-convection equations, 2) to simulate moisture and heat flow for increasing the temperature of ground surface for a long term period. Depending on long term temperature fluctuations, one can predict aggregation or degradation of permafrost. A two-dimensional model of coupled heat and moisture transport is used in this study. This model is based on a Galerkin finite element solution using a linear shape function for triangular elements. Short term temperature prediction using the conduction model was tested; the results are comparable with the measured values. A contribution of the convection mode is negligible for the cold period of the year. An increase of the mean annual ground surface temperature by some 2°C will favour the degradation of unsaturated permafrost zones within a few decades.

Contexte

Section :
Géophysique
news icon Thème du colloque :
Géophysique
host icon Hôte : Université Laval

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