A contribution to the prediction of slush avalanches
Symposium on Snow and Ice Processes at the Earth's Surface. Sapporo 1984 Slush avalanches, primarily known from uninhabited arctic and mountainous regions, every year cause damage to man and property in Norway. Seeking objective criteria to identify their hazard zones, and methods for their pre...
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Online Access: | https://hdl.handle.net/11250/3096575 https://doi.org/10.3189/1985AoG6-1-1-4 |
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ftngi:oai:ngi.brage.unit.no:11250/3096575 2023-11-12T04:01:18+01:00 A contribution to the prediction of slush avalanches Hestnes, Erik 1985 application/pdf https://hdl.handle.net/11250/3096575 https://doi.org/10.3189/1985AoG6-1-1-4 eng eng https://hdl.handle.net/11250/3096575 https://doi.org/10.3189/1985AoG6-1-1-4 International Glaciological Society 68-70 6 Annals of Glaciology Avalanche-RnD Snøskred-FoU Chapter 1985 ftngi https://doi.org/10.3189/1985AoG6-1-1-4 2023-10-18T22:48:44Z Symposium on Snow and Ice Processes at the Earth's Surface. Sapporo 1984 Slush avalanches, primarily known from uninhabited arctic and mountainous regions, every year cause damage to man and property in Norway. Seeking objective criteria to identify their hazard zones, and methods for their prediction and control, the Norwegian Geotechnical In stitute (NGI) has started a research program on these topics. Thirty-four slush avalanches with known loca tions of crown surface have been investigated with regard to geomorphic and climatic characteristics. Starting zones, crown surfaces and tracks were classified according to geomorphic conditions important to avalanche release and motion. Weak cohesionless snowpacks of coarse grain s, and hard la yers or crusts of ice in snow cover or on the ground, are cr itica l conditions for slush avalanche release. Intense rain, falling on cohesionless new snow on these substrata, is the most striking feature of current weather sit uations. The main starting zones were drainage channels, sloping bogs, depressions and open fields. Channel-like, scar-like or bowl-like features appeared in the snow cover due to avalanche release. Three main types of release were identified: I) Sudden release from crown surface, 2) drainage of snow-emba nked , water-satu rated snowfields through narrow outlets and 3) rapid head ward growth from first point of release. En largements and confinements along Ihe avalanche tracks were caused by distinctly defined features in the tracks. Article in Journal/Newspaper Annals of Glaciology Arctic Norwegian Geotechnical Institute (NGI) Digital Archive Arctic Norway Annals of Glaciology 6 1 4 |
institution |
Open Polar |
collection |
Norwegian Geotechnical Institute (NGI) Digital Archive |
op_collection_id |
ftngi |
language |
English |
topic |
Avalanche-RnD Snøskred-FoU |
spellingShingle |
Avalanche-RnD Snøskred-FoU Hestnes, Erik A contribution to the prediction of slush avalanches |
topic_facet |
Avalanche-RnD Snøskred-FoU |
description |
Symposium on Snow and Ice Processes at the Earth's Surface. Sapporo 1984 Slush avalanches, primarily known from uninhabited arctic and mountainous regions, every year cause damage to man and property in Norway. Seeking objective criteria to identify their hazard zones, and methods for their prediction and control, the Norwegian Geotechnical In stitute (NGI) has started a research program on these topics. Thirty-four slush avalanches with known loca tions of crown surface have been investigated with regard to geomorphic and climatic characteristics. Starting zones, crown surfaces and tracks were classified according to geomorphic conditions important to avalanche release and motion. Weak cohesionless snowpacks of coarse grain s, and hard la yers or crusts of ice in snow cover or on the ground, are cr itica l conditions for slush avalanche release. Intense rain, falling on cohesionless new snow on these substrata, is the most striking feature of current weather sit uations. The main starting zones were drainage channels, sloping bogs, depressions and open fields. Channel-like, scar-like or bowl-like features appeared in the snow cover due to avalanche release. Three main types of release were identified: I) Sudden release from crown surface, 2) drainage of snow-emba nked , water-satu rated snowfields through narrow outlets and 3) rapid head ward growth from first point of release. En largements and confinements along Ihe avalanche tracks were caused by distinctly defined features in the tracks. |
format |
Article in Journal/Newspaper |
author |
Hestnes, Erik |
author_facet |
Hestnes, Erik |
author_sort |
Hestnes, Erik |
title |
A contribution to the prediction of slush avalanches |
title_short |
A contribution to the prediction of slush avalanches |
title_full |
A contribution to the prediction of slush avalanches |
title_fullStr |
A contribution to the prediction of slush avalanches |
title_full_unstemmed |
A contribution to the prediction of slush avalanches |
title_sort |
contribution to the prediction of slush avalanches |
publishDate |
1985 |
url |
https://hdl.handle.net/11250/3096575 https://doi.org/10.3189/1985AoG6-1-1-4 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Annals of Glaciology Arctic |
genre_facet |
Annals of Glaciology Arctic |
op_source |
68-70 6 Annals of Glaciology |
op_relation |
https://hdl.handle.net/11250/3096575 https://doi.org/10.3189/1985AoG6-1-1-4 |
op_rights |
International Glaciological Society |
op_doi |
https://doi.org/10.3189/1985AoG6-1-1-4 |
container_title |
Annals of Glaciology |
container_volume |
6 |
container_start_page |
1 |
op_container_end_page |
4 |
_version_ |
1782332257282818048 |