The Movement of Melting Ice Over Rough Surfaces
Laboratory experiments show that pieces of melting ice about one centimetre across, moving under normal loads across roughened glass surfaces, travel much faster than regelation theory predicts. The discrepancy is as much as 40 times for the finest scale surfaces, (prepared by grinding with carborun...
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Language: | English |
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Cambridge University Press (CUP)
1975
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Online Access: | http://dx.doi.org/10.1017/s0022143000021778 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021778 |
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crcambridgeupr:10.1017/s0022143000021778 2024-03-03T08:46:06+00:00 The Movement of Melting Ice Over Rough Surfaces Chadbourne, B. D. Cole, R. M. Tootill, S. Walford, M. E. R. 1975 http://dx.doi.org/10.1017/s0022143000021778 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021778 en eng Cambridge University Press (CUP) Journal of Glaciology volume 14, issue 71, page 287-292 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1975 crcambridgeupr https://doi.org/10.1017/s0022143000021778 2024-02-08T08:47:47Z Laboratory experiments show that pieces of melting ice about one centimetre across, moving under normal loads across roughened glass surfaces, travel much faster than regelation theory predicts. The discrepancy is as much as 40 times for the finest scale surfaces, (prepared by grinding with carborundum particles of 60 μm mean diameter) and increases further if the load is reduced below three bars. On the other hand melting ice moves, under similar conditions, across rough porous glass surfaces at approximately the speed predicted by regelation theory. We suggest the reason is that melt water, produced by the dissipation of frictional energy, accumulates at the interface between ice and ground glass where it promotes sliding, but can easily drain away from a porous surface. Similar effects at the bed of a temperate glacier may cause the contribution of regelation to the bed-slip process to depend sensitively upon the melt-water regime. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 14 71 287 292 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Chadbourne, B. D. Cole, R. M. Tootill, S. Walford, M. E. R. The Movement of Melting Ice Over Rough Surfaces |
topic_facet |
Earth-Surface Processes |
description |
Laboratory experiments show that pieces of melting ice about one centimetre across, moving under normal loads across roughened glass surfaces, travel much faster than regelation theory predicts. The discrepancy is as much as 40 times for the finest scale surfaces, (prepared by grinding with carborundum particles of 60 μm mean diameter) and increases further if the load is reduced below three bars. On the other hand melting ice moves, under similar conditions, across rough porous glass surfaces at approximately the speed predicted by regelation theory. We suggest the reason is that melt water, produced by the dissipation of frictional energy, accumulates at the interface between ice and ground glass where it promotes sliding, but can easily drain away from a porous surface. Similar effects at the bed of a temperate glacier may cause the contribution of regelation to the bed-slip process to depend sensitively upon the melt-water regime. |
format |
Article in Journal/Newspaper |
author |
Chadbourne, B. D. Cole, R. M. Tootill, S. Walford, M. E. R. |
author_facet |
Chadbourne, B. D. Cole, R. M. Tootill, S. Walford, M. E. R. |
author_sort |
Chadbourne, B. D. |
title |
The Movement of Melting Ice Over Rough Surfaces |
title_short |
The Movement of Melting Ice Over Rough Surfaces |
title_full |
The Movement of Melting Ice Over Rough Surfaces |
title_fullStr |
The Movement of Melting Ice Over Rough Surfaces |
title_full_unstemmed |
The Movement of Melting Ice Over Rough Surfaces |
title_sort |
movement of melting ice over rough surfaces |
publisher |
Cambridge University Press (CUP) |
publishDate |
1975 |
url |
http://dx.doi.org/10.1017/s0022143000021778 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021778 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 14, issue 71, page 287-292 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000021778 |
container_title |
Journal of Glaciology |
container_volume |
14 |
container_issue |
71 |
container_start_page |
287 |
op_container_end_page |
292 |
_version_ |
1792502010072793088 |