A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses
Abstract A general two-dimensional numerical model for a typical flow line of a glacier or ice cap has been developed which results in periodical surging for certain ranges of the input parameters. The input includes the bedrock and surface-balance profiles along the flow line, some three-dimensiona...
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Language: | English |
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Cambridge University Press (CUP)
1976
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Online Access: | http://dx.doi.org/10.1017/s0022143000031701 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000031701 |
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crcambridgeupr:10.1017/s0022143000031701 2024-03-03T08:37:28+00:00 A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses Budd, W.F. Mcinnes, B.J. 1976 http://dx.doi.org/10.1017/s0022143000031701 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000031701 en eng Cambridge University Press (CUP) Journal of Glaciology volume 16, issue 74, page 304-305 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1976 crcambridgeupr https://doi.org/10.1017/s0022143000031701 2024-02-08T08:39:08Z Abstract A general two-dimensional numerical model for a typical flow line of a glacier or ice cap has been developed which results in periodical surging for certain ranges of the input parameters. The input includes the bedrock and surface-balance profiles along the flow line, some three-dimensional parameterization depending on the cross-section shape and the flow-line patterns, the flow properties of the ice, and a numerical basal lubrication factor. The movie shows how a number of different ice masses grow from zero thickness to either steady state or a periodically surging state depending on the input. Typical examples of real surging ice masses from the small to the large are closely matched by the model in many effects such as the period, duration, and speed of the surges, as well as the length and thickness changes. A preliminary study for the surging potential of a flow line in east Antarctica is also made even though the full temperature modelling is not included. The results indicate that periodic surging of the ice sheet can develop in spite of the expected high viscosity. The resultant surface profile is very similar to the measured profile. For much lower viscosities steady-state, fast-sliding, ice-stream flow develops. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice cap Ice Sheet Journal of Glaciology Cambridge University Press East Antarctica Journal of Glaciology 16 74 304 305 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Budd, W.F. Mcinnes, B.J. A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
topic_facet |
Earth-Surface Processes |
description |
Abstract A general two-dimensional numerical model for a typical flow line of a glacier or ice cap has been developed which results in periodical surging for certain ranges of the input parameters. The input includes the bedrock and surface-balance profiles along the flow line, some three-dimensional parameterization depending on the cross-section shape and the flow-line patterns, the flow properties of the ice, and a numerical basal lubrication factor. The movie shows how a number of different ice masses grow from zero thickness to either steady state or a periodically surging state depending on the input. Typical examples of real surging ice masses from the small to the large are closely matched by the model in many effects such as the period, duration, and speed of the surges, as well as the length and thickness changes. A preliminary study for the surging potential of a flow line in east Antarctica is also made even though the full temperature modelling is not included. The results indicate that periodic surging of the ice sheet can develop in spite of the expected high viscosity. The resultant surface profile is very similar to the measured profile. For much lower viscosities steady-state, fast-sliding, ice-stream flow develops. |
format |
Article in Journal/Newspaper |
author |
Budd, W.F. Mcinnes, B.J. |
author_facet |
Budd, W.F. Mcinnes, B.J. |
author_sort |
Budd, W.F. |
title |
A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
title_short |
A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
title_full |
A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
title_fullStr |
A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
title_full_unstemmed |
A Movie Film Illustrating the Numerical Modelling of Periodically Surging Ice Masses |
title_sort |
movie film illustrating the numerical modelling of periodically surging ice masses |
publisher |
Cambridge University Press (CUP) |
publishDate |
1976 |
url |
http://dx.doi.org/10.1017/s0022143000031701 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000031701 |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica Ice cap Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctica East Antarctica Ice cap Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 16, issue 74, page 304-305 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000031701 |
container_title |
Journal of Glaciology |
container_volume |
16 |
container_issue |
74 |
container_start_page |
304 |
op_container_end_page |
305 |
_version_ |
1792499104096452608 |