The freezing of peatland
It is estimated that peatland covers more than one million square kilometres of Canada, extending from the southernmost part of the country to the Arctic in the continuous permafrost zone. This terrain has been subjected to increasing scientific and engineering study as northern development progress...
| Main Authors: | , |
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| Format: | Report |
| Language: | English |
| Published: |
National Research Council of Canada
1972
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| Online Access: | https://doi.org/10.4224/20373852 https://nrc-publications.canada.ca/eng/view/ft/?id=59048809-de38-4aa9-a4d5-23800e7d5637 https://nrc-publications.canada.ca/eng/view/object/?id=59048809-de38-4aa9-a4d5-23800e7d5637 https://nrc-publications.canada.ca/fra/voir/objet/?id=59048809-de38-4aa9-a4d5-23800e7d5637 |
| Summary: | It is estimated that peatland covers more than one million square kilometres of Canada, extending from the southernmost part of the country to the Arctic in the continuous permafrost zone. This terrain has been subjected to increasing scientific and engineering study as northern development progresses. Many geotechnical engineering activities in Canada are affected by the freezing of peatland; the operation of off-road vehicles on peat terrain, the construction of oil and gas pipelines, and the erection of temporary structures all require information on the freezing process in peat terrain. The present paper is intended to give engineers and other workers a practical appreciation of the rate of freezing and thawing, depth of frost penetration and thaw, and the influence of climate and terrain on these processes. It is based on information available in the literature and on field observations at two sites, one the Mer Bleue peat bog near Ottawa in the zone of seasonal freezing, the other at Thompson, Manitoba, in the middle of the discontinuous permafrost zone. On évalue à plus d'un million de kilomètres carrés l'étendue de terrain tourbeux qui couvrent le Canada, de son point le plus au sud jusqu'à l'Arctique, dans la zone à pergélisol continu. Le développement rapide du Nord a donné lieu à de nombreuses études de ces terrains par des hommes de sciences et des ingénieurs. Le gel de terrain tourbeux affecte de nombreuses activités géotechniques des ingénieurs au Canada; la manoeuvre de véhicules tout-terrain sur des terrain tourbeux, la constructin d'oléoducs et de gazoducs et l'é rection de structures temporaires exigent une connaissance du mécanisme de congélation dans les terrain tourbeux. Le présent article donne aux ingénieurs et autres ouvriers une é valuation pratique du taux de congélation et de décongé lation, de la profondeur de pénétration du gel et du dégel et de l'influence qu'exercent le climat et le terrain sur ces mécanismes. Les auteurs se basent sur les renseignements disponibles sur ce sujet ... |
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