Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T.
A long-term sediment budget (1947−1985) for northern Richards Island shows that, when ground ice and offshore erosion are accounted for, there is a near balance between headland erosion and coastal deposition. Excess ice constitutes about 20% of the total volume of eroded material from the headlands...
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Canadian Science Publishing
1996
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crcansciencepubl:10.1139/e96-050 2024-06-23T07:51:40+00:00 Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. Dallimore, Scott R. Wolfe, Stephen A. Solomon, Steven M. 1996 http://dx.doi.org/10.1139/e96-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-050 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 33, issue 5, page 664-675 ISSN 0008-4077 1480-3313 journal-article 1996 crcansciencepubl https://doi.org/10.1139/e96-050 2024-06-13T04:10:50Z A long-term sediment budget (1947−1985) for northern Richards Island shows that, when ground ice and offshore erosion are accounted for, there is a near balance between headland erosion and coastal deposition. Excess ice constitutes about 20% of the total volume of eroded material from the headlands, with massive ground ice contributing nearly 9% and segregated ice lenses and ice wedges making up the remainder. Coastal response to major storms in 1987 and 1993 suggests that erosion is episodic, with short periods of intense disruption followed by readjustment of cliff profiles. Processes characteristic of this environment include mechanical erosion of ice-bonded sediments creating unstable erosional niches, mechanical failure of niches along ice-wedge planes, and longer term thermal erosion of ice-bonded sediments. Where ice contents are high, localized thaw slumps initiated by coastal erosion may retreat at rates substantially higher than those observed at other sections of the coast. Cliff-top retreat rates may be out of phase with storm-event chronology. Article in Journal/Newspaper Beaufort Sea Ice permafrost Richards Island wedge* Canadian Science Publishing Canadian Journal of Earth Sciences 33 5 664 675 |
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Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
A long-term sediment budget (1947−1985) for northern Richards Island shows that, when ground ice and offshore erosion are accounted for, there is a near balance between headland erosion and coastal deposition. Excess ice constitutes about 20% of the total volume of eroded material from the headlands, with massive ground ice contributing nearly 9% and segregated ice lenses and ice wedges making up the remainder. Coastal response to major storms in 1987 and 1993 suggests that erosion is episodic, with short periods of intense disruption followed by readjustment of cliff profiles. Processes characteristic of this environment include mechanical erosion of ice-bonded sediments creating unstable erosional niches, mechanical failure of niches along ice-wedge planes, and longer term thermal erosion of ice-bonded sediments. Where ice contents are high, localized thaw slumps initiated by coastal erosion may retreat at rates substantially higher than those observed at other sections of the coast. Cliff-top retreat rates may be out of phase with storm-event chronology. |
format |
Article in Journal/Newspaper |
author |
Dallimore, Scott R. Wolfe, Stephen A. Solomon, Steven M. |
spellingShingle |
Dallimore, Scott R. Wolfe, Stephen A. Solomon, Steven M. Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
author_facet |
Dallimore, Scott R. Wolfe, Stephen A. Solomon, Steven M. |
author_sort |
Dallimore, Scott R. |
title |
Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
title_short |
Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
title_full |
Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
title_fullStr |
Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
title_full_unstemmed |
Influence of ground ice and permafrost on coastal evolution, Richards Island, Beaufort Sea coast, N.W.T. |
title_sort |
influence of ground ice and permafrost on coastal evolution, richards island, beaufort sea coast, n.w.t. |
publisher |
Canadian Science Publishing |
publishDate |
1996 |
url |
http://dx.doi.org/10.1139/e96-050 http://www.nrcresearchpress.com/doi/pdf/10.1139/e96-050 |
genre |
Beaufort Sea Ice permafrost Richards Island wedge* |
genre_facet |
Beaufort Sea Ice permafrost Richards Island wedge* |
op_source |
Canadian Journal of Earth Sciences volume 33, issue 5, page 664-675 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e96-050 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
33 |
container_issue |
5 |
container_start_page |
664 |
op_container_end_page |
675 |
_version_ |
1802642792195817472 |