Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea
Proglacial braided river systems discharge large volumes of meltwater from ice sheets and transport coarse-grained sediments from the glaciated areas to the oceans. Here, we test the hypothesis if high-energy hydrological events can leave distinctive signatures in the sedimentary record of braided r...
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Cambridge University Press
2021
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Online Access: | https://doi.org/10.1017/jog.2020.115 https://doaj.org/article/a70cb099c1224eb396559458aa93bba6 |
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ftdoajarticles:oai:doaj.org/article:a70cb099c1224eb396559458aa93bba6 2023-05-15T13:51:00+02:00 Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea B. Bellwald S. Planke S. Polteau N. Lebedeva-Ivanova J.I. Faleide S.M. Morris S. Morse S. Castelltort 2021-06-01T00:00:00Z https://doi.org/10.1017/jog.2020.115 https://doaj.org/article/a70cb099c1224eb396559458aa93bba6 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S002214302000115X/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.115 0022-1430 1727-5652 https://doaj.org/article/a70cb099c1224eb396559458aa93bba6 Journal of Glaciology, Vol 67, Pp 404-420 (2021) Arctic glaciology climate change fluvial transport glacier hydrology Jökulhlaups (GLOFs) Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2021 ftdoajarticles https://doi.org/10.1017/jog.2020.115 2023-03-12T01:30:57Z Proglacial braided river systems discharge large volumes of meltwater from ice sheets and transport coarse-grained sediments from the glaciated areas to the oceans. Here, we test the hypothesis if high-energy hydrological events can leave distinctive signatures in the sedimentary record of braided river systems. We characterize the morphology and infer a mode of formation of a 25 km long and 1–3 km wide Early Pleistocene incised valley recently imaged in 3-D seismic data in the Hoop area, SW Barents Sea. The fluvial system, named Bjørnelva River Valley, carved 20 m deep channels into Lower Cretaceous bedrock at a glacial paleo-surface and deposited 28 channel bars along a paleo-slope gradient of ~0.64 m km−1. The landform morphologies and position relative to the paleo-surface support that Bjørnelva River Valley was formed in the proglacial domain of the Barents Sea Ice Sheet. Based on valley width and valley depth, we suggest that Bjørnelva River Valley represents a braided river system fed by violent outburst floods from a glacial lake, with estimated outburst discharges of ~160 000 m3 s−1. The morphological configuration of Bjørnelva River Valley can inform geohazard assessments in areas at risk of outburst flooding today and is an analogue for landscapes evolving in areas currently covered by the Greenland and Antarctic ice sheets. Article in Journal/Newspaper Antarc* Antarctic Arctic Barents Sea Climate change glacier Greenland Ice Sheet Journal of Glaciology Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Barents Sea Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Greenland Journal of Glaciology 67 263 404 420 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic glaciology climate change fluvial transport glacier hydrology Jökulhlaups (GLOFs) Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Arctic glaciology climate change fluvial transport glacier hydrology Jökulhlaups (GLOFs) Environmental sciences GE1-350 Meteorology. Climatology QC851-999 B. Bellwald S. Planke S. Polteau N. Lebedeva-Ivanova J.I. Faleide S.M. Morris S. Morse S. Castelltort Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
topic_facet |
Arctic glaciology climate change fluvial transport glacier hydrology Jökulhlaups (GLOFs) Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Proglacial braided river systems discharge large volumes of meltwater from ice sheets and transport coarse-grained sediments from the glaciated areas to the oceans. Here, we test the hypothesis if high-energy hydrological events can leave distinctive signatures in the sedimentary record of braided river systems. We characterize the morphology and infer a mode of formation of a 25 km long and 1–3 km wide Early Pleistocene incised valley recently imaged in 3-D seismic data in the Hoop area, SW Barents Sea. The fluvial system, named Bjørnelva River Valley, carved 20 m deep channels into Lower Cretaceous bedrock at a glacial paleo-surface and deposited 28 channel bars along a paleo-slope gradient of ~0.64 m km−1. The landform morphologies and position relative to the paleo-surface support that Bjørnelva River Valley was formed in the proglacial domain of the Barents Sea Ice Sheet. Based on valley width and valley depth, we suggest that Bjørnelva River Valley represents a braided river system fed by violent outburst floods from a glacial lake, with estimated outburst discharges of ~160 000 m3 s−1. The morphological configuration of Bjørnelva River Valley can inform geohazard assessments in areas at risk of outburst flooding today and is an analogue for landscapes evolving in areas currently covered by the Greenland and Antarctic ice sheets. |
format |
Article in Journal/Newspaper |
author |
B. Bellwald S. Planke S. Polteau N. Lebedeva-Ivanova J.I. Faleide S.M. Morris S. Morse S. Castelltort |
author_facet |
B. Bellwald S. Planke S. Polteau N. Lebedeva-Ivanova J.I. Faleide S.M. Morris S. Morse S. Castelltort |
author_sort |
B. Bellwald |
title |
Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
title_short |
Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
title_full |
Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
title_fullStr |
Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
title_full_unstemmed |
Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
title_sort |
characterization of a glacial paleo-outburst flood using high-resolution 3-d seismic data: bjørnelva river valley, sw barents sea |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
https://doi.org/10.1017/jog.2020.115 https://doaj.org/article/a70cb099c1224eb396559458aa93bba6 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Antarctic Arctic Barents Sea Glacial Lake Greenland |
geographic_facet |
Antarctic Arctic Barents Sea Glacial Lake Greenland |
genre |
Antarc* Antarctic Arctic Barents Sea Climate change glacier Greenland Ice Sheet Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Arctic Barents Sea Climate change glacier Greenland Ice Sheet Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology, Vol 67, Pp 404-420 (2021) |
op_relation |
https://www.cambridge.org/core/product/identifier/S002214302000115X/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2020.115 0022-1430 1727-5652 https://doaj.org/article/a70cb099c1224eb396559458aa93bba6 |
op_doi |
https://doi.org/10.1017/jog.2020.115 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
263 |
container_start_page |
404 |
op_container_end_page |
420 |
_version_ |
1766254561329152000 |