The Constitution of Valley Glaciers
Abstract Ice streams composing a compound valley glacier may be juxtaposed, inset or superimposed, and Demorest’s concepts of ice flowage provide a plausible explanation for these relations. If valley floors are accordant, juxtaposition results because the waxing force of gravity and obstructed grav...
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Cambridge University Press (CUP)
1948
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Online Access: | http://dx.doi.org/10.1017/s0022143000008042 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008042 |
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crcambridgeupr:10.1017/s0022143000008042 2024-09-15T18:15:39+00:00 The Constitution of Valley Glaciers Sharp, Robert P. 1948 http://dx.doi.org/10.1017/s0022143000008042 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008042 en eng Cambridge University Press (CUP) Journal of Glaciology volume 1, issue 04, page 182-189 ISSN 0022-1430 1727-5652 journal-article 1948 crcambridgeupr https://doi.org/10.1017/s0022143000008042 2024-07-31T04:04:38Z Abstract Ice streams composing a compound valley glacier may be juxtaposed, inset or superimposed, and Demorest’s concepts of ice flowage provide a plausible explanation for these relations. If valley floors are accordant, juxtaposition results because the waxing force of gravity and obstructed gravity flow in the tributary glacier overcomes the waning force of obstructed extrusion flow from the trunk glacier enabling the tributary to force its way into a juxtaposed position with the trunk glacier in the main valley. If discordance in valley floors is less than the thickness of the trunk glacier, an insert position develops by the same mechanism. If the discordance is greater than the thickness of the trunk glacier, superimposition results. Locally, superimposed or inset relations may be established by exceptionally rapid advances, even with accordant valley floors, but any superimposed ice stream shortly becomes inset by sinking into the underlying ice, at least in temperate glaciers. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 1 04 182 189 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Ice streams composing a compound valley glacier may be juxtaposed, inset or superimposed, and Demorest’s concepts of ice flowage provide a plausible explanation for these relations. If valley floors are accordant, juxtaposition results because the waxing force of gravity and obstructed gravity flow in the tributary glacier overcomes the waning force of obstructed extrusion flow from the trunk glacier enabling the tributary to force its way into a juxtaposed position with the trunk glacier in the main valley. If discordance in valley floors is less than the thickness of the trunk glacier, an insert position develops by the same mechanism. If the discordance is greater than the thickness of the trunk glacier, superimposition results. Locally, superimposed or inset relations may be established by exceptionally rapid advances, even with accordant valley floors, but any superimposed ice stream shortly becomes inset by sinking into the underlying ice, at least in temperate glaciers. |
format |
Article in Journal/Newspaper |
author |
Sharp, Robert P. |
spellingShingle |
Sharp, Robert P. The Constitution of Valley Glaciers |
author_facet |
Sharp, Robert P. |
author_sort |
Sharp, Robert P. |
title |
The Constitution of Valley Glaciers |
title_short |
The Constitution of Valley Glaciers |
title_full |
The Constitution of Valley Glaciers |
title_fullStr |
The Constitution of Valley Glaciers |
title_full_unstemmed |
The Constitution of Valley Glaciers |
title_sort |
constitution of valley glaciers |
publisher |
Cambridge University Press (CUP) |
publishDate |
1948 |
url |
http://dx.doi.org/10.1017/s0022143000008042 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000008042 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 1, issue 04, page 182-189 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000008042 |
container_title |
Journal of Glaciology |
container_volume |
1 |
container_issue |
04 |
container_start_page |
182 |
op_container_end_page |
189 |
_version_ |
1810453569049985024 |