Changes in Permafrost Distribution Produced by a Migrating River Meander in the Northern
ABSTRACT. Drill hole data from the Eagle River crossing by the Dempster Highway near the Arctic Circle have been interpreted on the basis of point bars formed by a migrating meander loop and dated by tree core ring counts. In the wake of the migrating meander loop, two waves of changes in the state...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.8262 http://pubs.aina.ucalgary.ca/arctic/arctic32-2-148.pdf |
| Summary: | ABSTRACT. Drill hole data from the Eagle River crossing by the Dempster Highway near the Arctic Circle have been interpreted on the basis of point bars formed by a migrating meander loop and dated by tree core ring counts. In the wake of the migrating meander loop, two waves of changes in the state of permafrost have penetrated downwards into the ground, associated with a downward migrating and thickening interpermafrost talik layer containing water under pressure. RfiSUMfi. Les renseignements de puits dans 1 “Eagle River, ” au passage de la grand’route de Dempster, près du cercle arctiques s’interpretent comme des barres sableuses fluviales, formées par la deplacement d’une boucle de meandre; on les a datées en comptant les anneaux de croissance d’un tronc d’arbre. Au debut de la migration du meandre, il y a eu deux vagues d’approfondissement du permafrost dans le sol, associés avec la migration vers le bas et l’épaississement d’une lentille interne au permafrost, contenant de l’eau sous pression. |
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