TIME EVOLUTION OF THERMAL CONDUCTIVITY AND INTRINSIC PERMEABILITY OF A SNOW COVER

Olivier Lachance, Jean Côté

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Laboratory and Insitu Testing in Cold Regions / Essais en laboratoires et essais in situ pour les régions nordiques

ABSTRACT: This paper presents the experimental results of a study on the time-evolution of the intrinsic permeability, thermal conductivity and porosity of a single snow layer. Undisturbed snow batches were collected at Laval University in the winter of 2014 at weekly intervals. They were later reworked to produce samples of different porosities. The experimental results obtained for the different samples ranged from 3.59 x 10-9 to 8.71 x 10-11 m2 for the permeability and from 0.089 to 0.372 W/mK for conductivity with porosity varying from 0.46 up to 0.80. A temporal evolution of the relation permeability-porosity has been observed and an effective radius corresponding to each snow batch and sample was obtained using an existing permeability model (Calonne et al. (2012)). That radius has allowed the quantification of the temporal evolution process. A structure effect resulting from compaction has also been noticed on the thermal conductivity measurements of fresh snow samples.

RÉSUMÉ: relations entre la perméabilité intrinsèque, orosités y ont été extraits. Les plages de valeurs des résultats expérimentaux obtenus sont de 3.59 x 10-9 à 8.71 x 10-11 m2 pour la perméabilité intrinsèque et de 0.089 à 0.372 W/mK pour la conductivité thermique pour des porosités de 0.46 à 0.80. Une évolution temporelle de la relation perméabilité-porosité a . (2012)). Un effet de structure résultant de la compaction a également été remarqué sur la mesure de la conductivité thermique d'échantillons de neige fraiche.

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