THERMAL AND HYDROLOGICAL EFFECTS OF SLOPE DISTURBANCES IN A CONTINUOUS PERMAFROST ENVIRONMENT
In a wntinuous permafrost area near Resolute, N.W.T. a berm, a trench and an impermeable subsurface flow barrier were emplaced across a slope, and compared with two undisturbed segments. These plots enabled the observation of thermal and hydrological effects of these disturbances in a continuous per...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.512.5952 http://pubs.aina.ucalgary.ca/cpc/CPC5-175.pdf |
| Summary: | In a wntinuous permafrost area near Resolute, N.W.T. a berm, a trench and an impermeable subsurface flow barrier were emplaced across a slope, and compared with two undisturbed segments. These plots enabled the observation of thermal and hydrological effects of these disturbances in a continuous permafrost environment, during the course of an Arctic summer. The disturbed slope plots interrupted the downslope movement of water. Where the snow distribution was affected by the presence of a trench or a berm, the pattern of ground thaw was modified also. Additionally, a section of a vehicular track across a wet depression was examined. Compared with the dry road bed, the wet section had a shallower frost table, retained more snow in the ruts and. being fed by the wet depression upslope, maintained a high water table for most of the summer. Resume Dans une zone de pergelis01 continu situ6e prks de Resolute (T.N.-0.). on a mis en place une berme, une tranch6e et une barrikre impermeable aux dcoulements soutenains en travers d'une pente, puis on a comparb cet endroit 21 deux segments intacts. Ces parcelles ont permis d'observer les effets thermiques et hydrologiques de ces perturbations dam un milieu de perg6lisol continu. au cows d'un 6 d arctique. Sur les parcelles B pente perturb&. le mouvement de l'eau vers le bas de la pente a 6t6 interrompu. Aux endroits oh la dpartition de la neige a 6d affect & par la prbence d'une tranch6e ou d'une berme. la configuration du d6gel dans le sol a aussi 6d modifi6e. En outre, un bout de piste pour v6hicules B travemune &pression humide a bd exarnin6. Comparativement 2I la partie skhe du chemin, le tronpn humide possMait un Eront de gel moins profond; retenait plus & neige dans les ornihes et, &ant aliment & par les versants, a maintenu une nappe phrhtique 6lev & pendant la plus grande partie de 1'6t6. |
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