The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast
A large lake, measuring 600 m × 300 m and with a depth of nearly 5 m, was artificially drained on 13 August 1978. Observations on the formation, width, and depth of thermal contraction cracks for the first 7 years show that the crack profiles and ice wedge growth rates differ markedly from those of...
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Canadian Science Publishing
1986
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Online Access: | http://dx.doi.org/10.1139/e86-164 http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-164 |
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crcansciencepubl:10.1139/e86-164 2024-10-13T14:05:30+00:00 The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast Mackay, J. Ross 1986 http://dx.doi.org/10.1139/e86-164 http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-164 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 23, issue 11, page 1782-1795 ISSN 0008-4077 1480-3313 journal-article 1986 crcansciencepubl https://doi.org/10.1139/e86-164 2024-09-27T04:07:24Z A large lake, measuring 600 m × 300 m and with a depth of nearly 5 m, was artificially drained on 13 August 1978. Observations on the formation, width, and depth of thermal contraction cracks for the first 7 years show that the crack profiles and ice wedge growth rates differ markedly from those of old ice wedges reported in the literature. The first winter's cracks had box-like profiles, with surface widths to 10 cm and depths to 2.5 m. Some cracks continued to widen and deepen, once opened in early winter, and then narrowed or even closed completely in summer. Mean growth rates for the ice wedges for the first few years have been as much as 3.5 cm/year. Temperature gradients at the time of first cracking have been in the range of 10–15 °C/m. The growth rate of young ice wedges is site specific and temperature dependent, varying with factors such as the temperature gradient, vegetation, and snow cover, so an estimate of the age of an ice wedge from its width will usually be impossible. A study of crack widths indicates that the apparent coefficient of linear expansion of frozen ground may be several times that of ice. Upward cracking has been proven. Article in Journal/Newspaper Arctic Canadian Science Publishing Arctic Canadian Journal of Earth Sciences 23 11 1782 1795 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A large lake, measuring 600 m × 300 m and with a depth of nearly 5 m, was artificially drained on 13 August 1978. Observations on the formation, width, and depth of thermal contraction cracks for the first 7 years show that the crack profiles and ice wedge growth rates differ markedly from those of old ice wedges reported in the literature. The first winter's cracks had box-like profiles, with surface widths to 10 cm and depths to 2.5 m. Some cracks continued to widen and deepen, once opened in early winter, and then narrowed or even closed completely in summer. Mean growth rates for the ice wedges for the first few years have been as much as 3.5 cm/year. Temperature gradients at the time of first cracking have been in the range of 10–15 °C/m. The growth rate of young ice wedges is site specific and temperature dependent, varying with factors such as the temperature gradient, vegetation, and snow cover, so an estimate of the age of an ice wedge from its width will usually be impossible. A study of crack widths indicates that the apparent coefficient of linear expansion of frozen ground may be several times that of ice. Upward cracking has been proven. |
format |
Article in Journal/Newspaper |
author |
Mackay, J. Ross |
spellingShingle |
Mackay, J. Ross The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
author_facet |
Mackay, J. Ross |
author_sort |
Mackay, J. Ross |
title |
The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
title_short |
The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
title_full |
The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
title_fullStr |
The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
title_full_unstemmed |
The first 7 years (1978–1985) of ice wedge growth, Illisarvik experimental drained lake site, western Arctic coast |
title_sort |
first 7 years (1978–1985) of ice wedge growth, illisarvik experimental drained lake site, western arctic coast |
publisher |
Canadian Science Publishing |
publishDate |
1986 |
url |
http://dx.doi.org/10.1139/e86-164 http://www.nrcresearchpress.com/doi/pdf/10.1139/e86-164 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Canadian Journal of Earth Sciences volume 23, issue 11, page 1782-1795 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e86-164 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
23 |
container_issue |
11 |
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1782 |
op_container_end_page |
1795 |
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1812811591851180032 |