Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea
Abstract 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...
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Cambridge University Press (CUP)
2021
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Online Access: | http://dx.doi.org/10.1017/jog.2020.115 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302000115X |
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crcambridgeupr:10.1017/jog.2020.115 2024-04-28T07:59:40+00:00 Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea Bellwald, B. Planke, S. Polteau, S. Lebedeva-Ivanova, N. Faleide, J.I. Morris, S.M. Morse, S. Castelltort, S. 2021 http://dx.doi.org/10.1017/jog.2020.115 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302000115X en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 67, issue 263, page 404-420 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2021 crcambridgeupr https://doi.org/10.1017/jog.2020.115 2024-04-09T06:55:54Z Abstract 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 m 3 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 Barents Sea Greenland Ice Sheet Journal of Glaciology Sea ice Cambridge University Press Journal of Glaciology 67 263 404 420 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Bellwald, B. Planke, S. Polteau, S. Lebedeva-Ivanova, N. Faleide, J.I. Morris, S.M. Morse, S. Castelltort, S. Characterization of a glacial paleo-outburst flood using high-resolution 3-D seismic data: Bjørnelva River Valley, SW Barents Sea |
topic_facet |
Earth-Surface Processes |
description |
Abstract 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 m 3 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 |
Bellwald, B. Planke, S. Polteau, S. Lebedeva-Ivanova, N. Faleide, J.I. Morris, S.M. Morse, S. Castelltort, S. |
author_facet |
Bellwald, B. Planke, S. Polteau, S. Lebedeva-Ivanova, N. Faleide, J.I. Morris, S.M. Morse, S. Castelltort, S. |
author_sort |
Bellwald, B. |
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 (CUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1017/jog.2020.115 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302000115X |
genre |
Antarc* Antarctic Barents Sea Greenland Ice Sheet Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Barents Sea Greenland Ice Sheet Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 67, issue 263, page 404-420 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
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_ |
1797572263570046976 |