Ground ice as an initiator of landforms in permafrost regions
The role of ground ice as an initiator of landforms in permafrost regions implies also the formation of landforms which result from the melting of ground ice. Many landforms in permafrost regions owe their origin to the build-up of ice in the ground. Several types of prominent features are formed by...
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1973
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| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=a55b8273-aaec-4fa1-b8ee-4bcd47700244 https://nrc-publications.canada.ca/eng/view/object/?id=a55b8273-aaec-4fa1-b8ee-4bcd47700244 https://nrc-publications.canada.ca/fra/voir/objet/?id=a55b8273-aaec-4fa1-b8ee-4bcd47700244 |
| Summary: | The role of ground ice as an initiator of landforms in permafrost regions implies also the formation of landforms which result from the melting of ground ice. Many landforms in permafrost regions owe their origin to the build-up of ice in the ground. Several types of prominent features are formed by the aggradation of permafrost and the accompanying formation of large masses of ground ice, many metres in size. Such landforms include pingos, palsas and peat plateaux, ice wedge polygons and rock glaciers. A second group of landforms associated with the degradation of permafrost and melting of ground ice includes thermokarst depressions and hollows, thaw lakes, thaw slumps, cemetery mounds and beaded streams. The Mackay classification of ground ice has systematized to a considerable degree the relationship between these landforms and forms of ground ice in permafrost regions. Le rôle de la glace de sol dans la formation du relief des régions de pergélisol comprend également les résultats de la fonte de la glace de sol. Plusieurs formes du relief dans les régions de pergélisol doivent leur origine à l' accumulation de glace dans le sol. De nombreuses formes saillantes résultent de l'alluvionnement du pergélisol et des masses de glace de sol de plusieurs mètres qui l' accompagnent. Ces formes comprennent les pingos, les palses et les plateaux tourbeux, les polygones de coins de glace et les glaciers rocheux. Un deuxième groupe de formes associé es à la dégradation du pergélisol et à la fonte de la glace de sol englobe les dépressions et creux de thermokarst, les lacs et les affaissements dus au dégel, les élévations de terre dites "cemetery mounds" et les cours d'eau en chapelet. La classification de Mackay de la glace de sol a coordonné dans une large mesure le rapport entre ces formes de relief et les formes de glace de sol dans les régions de pergélisol. Peer reviewed: No NRC publication: Yes |
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