In situ thermal profiles and laboratory impact experiments on iceberg ice
Abstract A series of 40 impact tests was conducted an large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe...
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Language: | English |
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1017/s0022143000035188 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000035188 |
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crcambridgeupr:10.1017/s0022143000035188 2024-03-03T08:46:09+00:00 In situ thermal profiles and laboratory impact experiments on iceberg ice Gagnon, R. E. Gammon, P. H. 1997 http://dx.doi.org/10.1017/s0022143000035188 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000035188 en eng Cambridge University Press (CUP) Journal of Glaciology volume 43, issue 145, page 569-582 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0022143000035188 2024-02-08T08:36:10Z Abstract A series of 40 impact tests was conducted an large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe location. Temperatures as low as –15°C were measured at penetration depths of about 8 m. The impact specimens were confined at the perimeter and base by a rigid metallic ring and plate. A spherically terminated impactor, with center-mounted pressure transducer, was dropped on to the flat top surface of specimens from various heights and with various added masses. Impact velocity varied from 1.8 to 3.9 m s −1 impactor mass varied from 155 to 510 kg and the ice-specimen temperature varied from –0.5° to –14.5°C. Peak center pressures averaged from about 25 MPa at the highest temperature to about 41 MPa at the lowest temperature, with the highest recorded pressure being 50 M Pa. Crater volume increased with increasing impact energy, as expected; however, the specific energy of the ejected material was found to decrease as the energy of impact and crater volume increased. A mechanism for this observed behaviour is proposed. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Flat Top ENVELOPE(-137.387,-137.387,63.225,63.225) Journal of Glaciology 43 145 569 582 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Gagnon, R. E. Gammon, P. H. In situ thermal profiles and laboratory impact experiments on iceberg ice |
topic_facet |
Earth-Surface Processes |
description |
Abstract A series of 40 impact tests was conducted an large right-circular cylinders (68.5 cm diameter and 25.7 cm thickness) of iceberg ice collected from an iceberg in Labrador. Temperature profiles were also obtained for the iceberg and the profiles exhibited differences associated with the probe location. Temperatures as low as –15°C were measured at penetration depths of about 8 m. The impact specimens were confined at the perimeter and base by a rigid metallic ring and plate. A spherically terminated impactor, with center-mounted pressure transducer, was dropped on to the flat top surface of specimens from various heights and with various added masses. Impact velocity varied from 1.8 to 3.9 m s −1 impactor mass varied from 155 to 510 kg and the ice-specimen temperature varied from –0.5° to –14.5°C. Peak center pressures averaged from about 25 MPa at the highest temperature to about 41 MPa at the lowest temperature, with the highest recorded pressure being 50 M Pa. Crater volume increased with increasing impact energy, as expected; however, the specific energy of the ejected material was found to decrease as the energy of impact and crater volume increased. A mechanism for this observed behaviour is proposed. |
format |
Article in Journal/Newspaper |
author |
Gagnon, R. E. Gammon, P. H. |
author_facet |
Gagnon, R. E. Gammon, P. H. |
author_sort |
Gagnon, R. E. |
title |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_short |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_full |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_fullStr |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_full_unstemmed |
In situ thermal profiles and laboratory impact experiments on iceberg ice |
title_sort |
in situ thermal profiles and laboratory impact experiments on iceberg ice |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0022143000035188 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000035188 |
long_lat |
ENVELOPE(-137.387,-137.387,63.225,63.225) |
geographic |
Flat Top |
geographic_facet |
Flat Top |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 43, issue 145, page 569-582 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000035188 |
container_title |
Journal of Glaciology |
container_volume |
43 |
container_issue |
145 |
container_start_page |
569 |
op_container_end_page |
582 |
_version_ |
1792502134436003840 |