Subglacial Water Pressures and the Shape of Subglacial Conduits
Abstract Measured subglacial water pressures are frequently higher than theoretical values calculated by assuming that subglacial conduits are straight and either circular or semi-circular in shape. While this may be attributed to errors in the estimates of conduit roughness or ice viscosity, we sug...
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Cambridge University Press (CUP)
1990
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Online Access: | http://dx.doi.org/10.1017/s0022143000005566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005566 |
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crcambridgeupr:10.1017/s0022143000005566 2023-06-11T04:13:26+02:00 Subglacial Water Pressures and the Shape of Subglacial Conduits Hooke, Roger LeB. Laumann, Tron Kohler, Jack 1990 http://dx.doi.org/10.1017/s0022143000005566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005566 en eng Cambridge University Press (CUP) Journal of Glaciology volume 36, issue 122, page 67-71 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1990 crcambridgeupr https://doi.org/10.1017/s0022143000005566 2023-05-01T18:21:50Z Abstract Measured subglacial water pressures are frequently higher than theoretical values calculated by assuming that subglacial conduits are straight and either circular or semi-circular in shape. While this may be attributed to errors in the estimates of conduit roughness or ice viscosity, we suggest here an alternative explanation: namely, that the conduits are actually broad and low rather than semi-circular. Good agreement between measured and calculated pressures can be obtained by assuming that the cross-sectional shape of conduits resembles the space between the arc of a circle and its chord. The angle subtended by the arc, θ, is treated as an adjustable parameter. In four cases studied, θ ranged from 2° to 36°. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press (via Crossref) Journal of Glaciology 36 122 67 71 |
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Open Polar |
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Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Hooke, Roger LeB. Laumann, Tron Kohler, Jack Subglacial Water Pressures and the Shape of Subglacial Conduits |
topic_facet |
Earth-Surface Processes |
description |
Abstract Measured subglacial water pressures are frequently higher than theoretical values calculated by assuming that subglacial conduits are straight and either circular or semi-circular in shape. While this may be attributed to errors in the estimates of conduit roughness or ice viscosity, we suggest here an alternative explanation: namely, that the conduits are actually broad and low rather than semi-circular. Good agreement between measured and calculated pressures can be obtained by assuming that the cross-sectional shape of conduits resembles the space between the arc of a circle and its chord. The angle subtended by the arc, θ, is treated as an adjustable parameter. In four cases studied, θ ranged from 2° to 36°. |
format |
Article in Journal/Newspaper |
author |
Hooke, Roger LeB. Laumann, Tron Kohler, Jack |
author_facet |
Hooke, Roger LeB. Laumann, Tron Kohler, Jack |
author_sort |
Hooke, Roger LeB. |
title |
Subglacial Water Pressures and the Shape of Subglacial Conduits |
title_short |
Subglacial Water Pressures and the Shape of Subglacial Conduits |
title_full |
Subglacial Water Pressures and the Shape of Subglacial Conduits |
title_fullStr |
Subglacial Water Pressures and the Shape of Subglacial Conduits |
title_full_unstemmed |
Subglacial Water Pressures and the Shape of Subglacial Conduits |
title_sort |
subglacial water pressures and the shape of subglacial conduits |
publisher |
Cambridge University Press (CUP) |
publishDate |
1990 |
url |
http://dx.doi.org/10.1017/s0022143000005566 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005566 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 36, issue 122, page 67-71 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000005566 |
container_title |
Journal of Glaciology |
container_volume |
36 |
container_issue |
122 |
container_start_page |
67 |
op_container_end_page |
71 |
_version_ |
1768390478428897280 |