Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies
Abstract During the 1984 and 1985 melt seasons, flow velocities and dispersive characteristics of the englacial and subglacial hydraulic system on Storglaciären, a small valley glacier in northern Sweden, were studied with the use of dye-trace tests. Similar tests conducted on one of the two princip...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1988
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000032263 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032263 |
id |
crcambridgeupr:10.1017/s0022143000032263 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000032263 2024-09-15T18:15:38+00:00 Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies Seaberg, Sheliah Z. Seaberg, John Z. Hooke, Roger Leb. Wiberg, Daniel W. 1988 http://dx.doi.org/10.1017/s0022143000032263 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032263 en eng Cambridge University Press (CUP) Journal of Glaciology volume 34, issue 117, page 217-227 ISSN 0022-1430 1727-5652 journal-article 1988 crcambridgeupr https://doi.org/10.1017/s0022143000032263 2024-07-24T04:02:31Z Abstract During the 1984 and 1985 melt seasons, flow velocities and dispersive characteristics of the englacial and subglacial hydraulic system on Storglaciären, a small valley glacier in northern Sweden, were studied with the use of dye-trace tests. Similar tests conducted on one of the two principal pro-glacial streams provided a basis for comparison of the combined englacial-subglacial system with the pro-glacial one. Velocities in the two systems were broadly comparable after compensating for the effect of slope differences. However, velocities in the glacial conduits increased almost linearly with discharge. Analysis suggests that this can be explained by an increase in water pressure in the conduits, combined with a decrease in effective sinuosity, as discharge increases. Dispersivity (the ratio of the dispersion coefficient to the water velocity) in the glacial system is high early in the season but decreases progressively during July. This is believed to reflect a change from an extensively braided to a more integrated drainage system. Dispersivity is only slightly lower in the pro-glacial streams than in the late-season glacial conduits, suggesting similar degrees of braiding. However, retardation of dye due to temporary storage is greater in the glacial conduits. This suggests that the glacial streams have a larger number of stable eddies in which dye can be trapped for extended periods of time. Article in Journal/Newspaper Journal of Glaciology Northern Sweden Cambridge University Press Journal of Glaciology 34 117 217 227 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
Abstract During the 1984 and 1985 melt seasons, flow velocities and dispersive characteristics of the englacial and subglacial hydraulic system on Storglaciären, a small valley glacier in northern Sweden, were studied with the use of dye-trace tests. Similar tests conducted on one of the two principal pro-glacial streams provided a basis for comparison of the combined englacial-subglacial system with the pro-glacial one. Velocities in the two systems were broadly comparable after compensating for the effect of slope differences. However, velocities in the glacial conduits increased almost linearly with discharge. Analysis suggests that this can be explained by an increase in water pressure in the conduits, combined with a decrease in effective sinuosity, as discharge increases. Dispersivity (the ratio of the dispersion coefficient to the water velocity) in the glacial system is high early in the season but decreases progressively during July. This is believed to reflect a change from an extensively braided to a more integrated drainage system. Dispersivity is only slightly lower in the pro-glacial streams than in the late-season glacial conduits, suggesting similar degrees of braiding. However, retardation of dye due to temporary storage is greater in the glacial conduits. This suggests that the glacial streams have a larger number of stable eddies in which dye can be trapped for extended periods of time. |
format |
Article in Journal/Newspaper |
author |
Seaberg, Sheliah Z. Seaberg, John Z. Hooke, Roger Leb. Wiberg, Daniel W. |
spellingShingle |
Seaberg, Sheliah Z. Seaberg, John Z. Hooke, Roger Leb. Wiberg, Daniel W. Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
author_facet |
Seaberg, Sheliah Z. Seaberg, John Z. Hooke, Roger Leb. Wiberg, Daniel W. |
author_sort |
Seaberg, Sheliah Z. |
title |
Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
title_short |
Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
title_full |
Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
title_fullStr |
Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
title_full_unstemmed |
Character of the Englacial and Subglacial Drainage System in the Lower Part of the Ablation Area of Storglaciären, Sweden, as Revealed by Dye-Trace Studies |
title_sort |
character of the englacial and subglacial drainage system in the lower part of the ablation area of storglaciären, sweden, as revealed by dye-trace studies |
publisher |
Cambridge University Press (CUP) |
publishDate |
1988 |
url |
http://dx.doi.org/10.1017/s0022143000032263 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000032263 |
genre |
Journal of Glaciology Northern Sweden |
genre_facet |
Journal of Glaciology Northern Sweden |
op_source |
Journal of Glaciology volume 34, issue 117, page 217-227 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000032263 |
container_title |
Journal of Glaciology |
container_volume |
34 |
container_issue |
117 |
container_start_page |
217 |
op_container_end_page |
227 |
_version_ |
1810453506876768256 |