| Titre | Local variability of ground ice occurrence at selected sites in the Mackenzie valley |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Heginbottom, J A; Kurfurst, P J |
| Source | Commission géologique du Canada, Dossier public 476, 1977, 113p., https://doi.org/10.4095/129276  Accès ouvert |
| Image |  |
| Année | 1977 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/129276 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Province | Territoires du Nord-Ouest |
| SNRC | 95G; 95H; 95I; 95J; 95K; 95M; 95N; 95O; 96C; 96D; 96E; 96F; 106H; 106I; 106J; 106M; 106N; 106O; 106P; 107B |
| Lat/Long OENS | -135.0000 -120.0000 69.0000 61.0000 |
| Sujets | trous de mine; glace fossile; lentilles de glace; pergélisol; humidité du sol; études pédologiques; géologie de l'ingénieur |
| Illustrations | coupes transversales |
| Diffusé | 1977 07 01; 2018 02 06 |
| Résumé | (disponible en anglais seulement)
Relatively undisturbed soil and ice samples collected from nine sites between Fort Simpson and Inuvik, N.W. T. formed the basis of this report on investigation
of the local variability of frozen ground and ground ice at shallow depths along the Mackenzie Valley Transportation Corridor. The sites were chosen to cover a range of environmental conditions such as slope, aspect, surficial geology, drainage and a
range of conditions resulting from the activities of man, such as forest fires, bulldozing, land clearing and highway construction. Frozen ground was found to be essentially continuous in the north becoming discontinuous to the south. The amount of
visible ground ice varied similarly, with many large discrete ice lenses in the north and practically none in the south. The greatest changes occur in the area between Inuvik and Fort Good Hope. Five factors were found to be particularly significant
in affecting the distribution and amount of permafrost and ground ice. The factors, and a summary of their effects, are as follows:
- Latitude: frozen ground is more extensive, occurs at shallower depths and includes more visible ice in the north
compared to the south.
- soil texture: fine textured soils contain more moisture and ice than coarse textured soils; there is a clear, positive relationship between the silt content and the natural water content;
-slope aspect: south facing
slopes are drier with less ground ice and north facing slopes wetter with more ground ice than flat areas; surface drainage: significant differences in ice content were seen under poorly and well drained areas, however the cause of the difference
was not consistent;
- surface distuxbance: removal of surface vegetation leads to thawing of permafrost and a thicker active layer, the degree of change is a function of time and the extent of vegetation removed.
The relative importance of
these factors varies from site to site. |
| GEOSCAN ID | 129276 |
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