Field measurements of electrical freezing potentials in permafrost areas
Electrical potentials developed during freezing of natural soils have been measured in two permafrost areas: one in a saturated sand in a drained lake (Illisarvik) on Richards Island where permafrost was aggrading downward 5.65 m below ground; the other, in a mud hummock in the active layer at Inuvi...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1983
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| Subjects: | |
| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=ff330ce3-2067-43bb-9fcf-24cc0f4796ae https://nrc-publications.canada.ca/eng/view/object/?id=ff330ce3-2067-43bb-9fcf-24cc0f4796ae https://nrc-publications.canada.ca/fra/voir/objet/?id=ff330ce3-2067-43bb-9fcf-24cc0f4796ae |
| Summary: | Electrical potentials developed during freezing of natural soils have been measured in two permafrost areas: one in a saturated sand in a drained lake (Illisarvik) on Richards Island where permafrost was aggrading downward 5.65 m below ground; the other, in a mud hummock in the active layer at Inuvik. Peak potentials of up to 1350 mV were measured on electrodes located on the advancing freezing front at Illisarvik. At Inuvik, maximum freezing potentials of up to 700 mV were measured as the active layer froze in winter. There was also evidence of downward water migration and freezing as the ground started to thaw at the surface in spring. Les tensions électriques qui apparaissent pendant la congélation des sols naturals ont été mesurées dans deux zones de pergélisol: l'une située dans le sable saturé d'un lac asséché (Illisarvik) sur l'île Richards où il y a épaississement du pergélisol vers le bas à 5,65 m sous la surface du sol et l'autre dans un tertre de vase dans la zone active à Inuvik. On a mesuré, au moyen d'électrodes placées sur le front de congélation à Illisarvik, des tensions de pointe atteignant 1350 mV. A Inuvik, on a mesuré des tensions de congélation maximales atteignant 700 mV pendant la congélation de la zone active en hiver. On a également observé des indices de migration vers le bas et de congélation de l'eau au moment du début du dégel du terrain en surface au printemps. Peer reviewed: Yes NRC publication: Yes |
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