Water movement in the firn of Storglaciären, Sweden
Abstract The hydraulic properties of the firn on Storglaciären, Sweden, were investigated in firn cores by water-table measurements and pumping tests. The mean density of the firn was 800 850 kg m 3 , giving an effective porosity of 0.073. The lower part of the firn layer was saturated with water, p...
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Language: | English |
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Cambridge University Press (CUP)
1999
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Online Access: | http://dx.doi.org/10.1017/s0022143000001787 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001787 |
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crcambridgeupr:10.1017/s0022143000001787 2024-03-03T08:46:02+00:00 Water movement in the firn of Storglaciären, Sweden Schneider, Thomas 1999 http://dx.doi.org/10.1017/s0022143000001787 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001787 en eng Cambridge University Press (CUP) Journal of Glaciology volume 45, issue 150, page 286-294 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0022143000001787 2024-02-08T08:36:15Z Abstract The hydraulic properties of the firn on Storglaciären, Sweden, were investigated in firn cores by water-table measurements and pumping tests. The mean density of the firn was 800 850 kg m 3 , giving an effective porosity of 0.073. The lower part of the firn layer was saturated with water, producing a maximum saturated layer of 5 m in late July. Hydraulic conductivity of the firn aquifer was determined from pumping tests to be 4.9 × 10 5 m s 1 . Percolation velocity, calculated from the time lag of maximal water input at the glacier surface and the water-level peaks, was 0.25 m h 1 . Percolation velocity increased over the ablation season, indicating a widening of the percolation pathways. A decrease in percolation velocity with percolation depth was found, reflecting decreasing permeability. The firn–water table responded to water input at the glacier surface with a delay of about 3 days. No diurnal variations were found in an area which was not influenced by fast drainage, indicating a diffusion of diurnal variations in meltwater production. One borehole intersected a water-filled cavity. Water level in this cavity showed diurnal variations, which probably were caused by diurnally produced meltwater waves moving fast through englacial conduits. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Storglaciären ENVELOPE(18.560,18.560,67.904,67.904) Journal of Glaciology 45 150 286 294 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Schneider, Thomas Water movement in the firn of Storglaciären, Sweden |
topic_facet |
Earth-Surface Processes |
description |
Abstract The hydraulic properties of the firn on Storglaciären, Sweden, were investigated in firn cores by water-table measurements and pumping tests. The mean density of the firn was 800 850 kg m 3 , giving an effective porosity of 0.073. The lower part of the firn layer was saturated with water, producing a maximum saturated layer of 5 m in late July. Hydraulic conductivity of the firn aquifer was determined from pumping tests to be 4.9 × 10 5 m s 1 . Percolation velocity, calculated from the time lag of maximal water input at the glacier surface and the water-level peaks, was 0.25 m h 1 . Percolation velocity increased over the ablation season, indicating a widening of the percolation pathways. A decrease in percolation velocity with percolation depth was found, reflecting decreasing permeability. The firn–water table responded to water input at the glacier surface with a delay of about 3 days. No diurnal variations were found in an area which was not influenced by fast drainage, indicating a diffusion of diurnal variations in meltwater production. One borehole intersected a water-filled cavity. Water level in this cavity showed diurnal variations, which probably were caused by diurnally produced meltwater waves moving fast through englacial conduits. |
format |
Article in Journal/Newspaper |
author |
Schneider, Thomas |
author_facet |
Schneider, Thomas |
author_sort |
Schneider, Thomas |
title |
Water movement in the firn of Storglaciären, Sweden |
title_short |
Water movement in the firn of Storglaciären, Sweden |
title_full |
Water movement in the firn of Storglaciären, Sweden |
title_fullStr |
Water movement in the firn of Storglaciären, Sweden |
title_full_unstemmed |
Water movement in the firn of Storglaciären, Sweden |
title_sort |
water movement in the firn of storglaciären, sweden |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0022143000001787 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000001787 |
long_lat |
ENVELOPE(18.560,18.560,67.904,67.904) |
geographic |
Storglaciären |
geographic_facet |
Storglaciären |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 45, issue 150, page 286-294 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000001787 |
container_title |
Journal of Glaciology |
container_volume |
45 |
container_issue |
150 |
container_start_page |
286 |
op_container_end_page |
294 |
_version_ |
1792501869202898944 |