Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway
A debris flow occurred on 8 May 2004, in Fjǽrland, Western Norway, due to a Glacial Lake Outburst Flood and a natural terminal moraine failure. The site was investigated in 2004 and 2005, using pre- and post-flow aerial photos, airborne laser scanning, and extensive field work investigations, result...
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ftoslouniv:oai:www.duo.uio.no:10852/53725 2023-05-15T16:39:12+02:00 Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik 2011-02-15T10:15:55Z http://hdl.handle.net/10852/53725 http://urn.nb.no/URN:NBN:no-56931 https://doi.org/10.5194/adgeo-14-301-2008 EN eng Copernicus http://urn.nb.no/URN:NBN:no-56931 Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik . Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway. Advances in Geosciences. 2008, 14, 301-307 http://hdl.handle.net/10852/53725 538513 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Advances in Geosciences&rft.volume=14&rft.spage=301&rft.date=2008 Advances in Geosciences 14 301 307 http://dx.doi.org/10.5194/adgeo-14-301-2008 URN:NBN:no-56931 Fulltext https://www.duo.uio.no/bitstream/handle/10852/53725/1/Lecomte_etal.pdf Attribution-NonCommercial-ShareAlike 2.5 Generic https://creativecommons.org/licenses/by-nc-sa/2.5/ CC-BY-NC-SA 1680-7340 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2011 ftoslouniv https://doi.org/10.5194/adgeo-14-301-2008 2020-06-21T08:50:15Z A debris flow occurred on 8 May 2004, in Fjǽrland, Western Norway, due to a Glacial Lake Outburst Flood and a natural terminal moraine failure. The site was investigated in 2004 and 2005, using pre- and post-flow aerial photos, airborne laser scanning, and extensive field work investigations, resulting in a good understanding of the mechanics of the debris flow, with quantification of the entrainment and determination of the final volume involved. However, though the moraine had a clear weak point, with lower elevation and erosion due to overflowing in the melting season, the sudden rupture of the moraine still needs to be explained. As moraines often contain an ice core, a possible cause could be the melting of the ice, inducing a progressive weakening of the structure. Geophysical investigations were therefore carried out in September 2006, including seismic refraction, GPR and resistivity. All methods worked well, but none revealed the presence of ice, though the depth to bedrock was determined. On the contrary, the moraine appeared to be highly saturated in water, especially in one area, away from the actual breach and corresponding to observed water seepage at the foot of the moraine. To estimate future hazard, water circulation through the moraine should be monitored over time. Article in Journal/Newspaper ice core Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Norway Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Advances in Geosciences 14 301 307 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
A debris flow occurred on 8 May 2004, in Fjǽrland, Western Norway, due to a Glacial Lake Outburst Flood and a natural terminal moraine failure. The site was investigated in 2004 and 2005, using pre- and post-flow aerial photos, airborne laser scanning, and extensive field work investigations, resulting in a good understanding of the mechanics of the debris flow, with quantification of the entrainment and determination of the final volume involved. However, though the moraine had a clear weak point, with lower elevation and erosion due to overflowing in the melting season, the sudden rupture of the moraine still needs to be explained. As moraines often contain an ice core, a possible cause could be the melting of the ice, inducing a progressive weakening of the structure. Geophysical investigations were therefore carried out in September 2006, including seismic refraction, GPR and resistivity. All methods worked well, but none revealed the presence of ice, though the depth to bedrock was determined. On the contrary, the moraine appeared to be highly saturated in water, especially in one area, away from the actual breach and corresponding to observed water seepage at the foot of the moraine. To estimate future hazard, water circulation through the moraine should be monitored over time. |
format |
Article in Journal/Newspaper |
author |
Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik |
spellingShingle |
Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
author_facet |
Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik |
author_sort |
Lecomte, Isabelle |
title |
Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
title_short |
Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
title_full |
Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
title_fullStr |
Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
title_full_unstemmed |
Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway |
title_sort |
using geophysics on a terminal moraine damming a glacial lake: the flatbre debris flow case,western norway |
publisher |
Copernicus |
publishDate |
2011 |
url |
http://hdl.handle.net/10852/53725 http://urn.nb.no/URN:NBN:no-56931 https://doi.org/10.5194/adgeo-14-301-2008 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Norway Glacial Lake |
geographic_facet |
Norway Glacial Lake |
genre |
ice core |
genre_facet |
ice core |
op_source |
1680-7340 |
op_relation |
http://urn.nb.no/URN:NBN:no-56931 Lecomte, Isabelle Thollet, Isabelle Juliussen, Håvard Hamran, Svein Erik . Using geophysics on a terminal moraine damming a glacial lake: the Flatbre debris flow case,Western Norway. Advances in Geosciences. 2008, 14, 301-307 http://hdl.handle.net/10852/53725 538513 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Advances in Geosciences&rft.volume=14&rft.spage=301&rft.date=2008 Advances in Geosciences 14 301 307 http://dx.doi.org/10.5194/adgeo-14-301-2008 URN:NBN:no-56931 Fulltext https://www.duo.uio.no/bitstream/handle/10852/53725/1/Lecomte_etal.pdf |
op_rights |
Attribution-NonCommercial-ShareAlike 2.5 Generic https://creativecommons.org/licenses/by-nc-sa/2.5/ |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.5194/adgeo-14-301-2008 |
container_title |
Advances in Geosciences |
container_volume |
14 |
container_start_page |
301 |
op_container_end_page |
307 |
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1766029523907772416 |