Ice and permafrost effects on delta morphology and channel dynamics
Arctic regions are changing rapidly as permafrost thaws and sea ice retreats. These changes directly affect Arctic river deltas, but how permafrost and ice alter delta hydrology and sediment transport are not well researched. This knowledge gap limits our ability to forecast how these systems will r...
Published in: | Geophysical Research Letters |
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Online Access: | http://www.osti.gov/servlets/purl/1525858 https://www.osti.gov/biblio/1525858 https://doi.org/10.1029/2019GL082792 |
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ftosti:oai:osti.gov:1525858 2023-07-30T04:00:58+02:00 Ice and permafrost effects on delta morphology and channel dynamics Lauzon, Rebecca Elizabeth Piliouras, Anastasia Rowland, Joel C. 2021-10-26 application/pdf http://www.osti.gov/servlets/purl/1525858 https://www.osti.gov/biblio/1525858 https://doi.org/10.1029/2019GL082792 unknown http://www.osti.gov/servlets/purl/1525858 https://www.osti.gov/biblio/1525858 https://doi.org/10.1029/2019GL082792 doi:10.1029/2019GL082792 58 GEOSCIENCES 2021 ftosti https://doi.org/10.1029/2019GL082792 2023-07-11T09:34:03Z Arctic regions are changing rapidly as permafrost thaws and sea ice retreats. These changes directly affect Arctic river deltas, but how permafrost and ice alter delta hydrology and sediment transport are not well researched. This knowledge gap limits our ability to forecast how these systems will respond to continued warming. We adapt the reduced complexity model of delta morphodynamics DeltaRCM to investigate the influences of permafrost and landfast ice on delta morphology and channel dynamics. We find that ice cover and permafrost decrease channel mobility, increase shoreline roughness, and route and deposit more sediment offshore. Ice cover also enhances overbank deposition, increasing subaerial delta elevations. Furthermore, our modelling suggests that permafrost and ice loss in a warming climate could lead to less overbank and offshore deposition and more dynamic and spatially distributed fluxes of water and sediment across Arctic river deltas. Other/Unknown Material Arctic Ice permafrost Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Geophysical Research Letters 46 12 6574 6582 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
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58 GEOSCIENCES |
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58 GEOSCIENCES Lauzon, Rebecca Elizabeth Piliouras, Anastasia Rowland, Joel C. Ice and permafrost effects on delta morphology and channel dynamics |
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58 GEOSCIENCES |
description |
Arctic regions are changing rapidly as permafrost thaws and sea ice retreats. These changes directly affect Arctic river deltas, but how permafrost and ice alter delta hydrology and sediment transport are not well researched. This knowledge gap limits our ability to forecast how these systems will respond to continued warming. We adapt the reduced complexity model of delta morphodynamics DeltaRCM to investigate the influences of permafrost and landfast ice on delta morphology and channel dynamics. We find that ice cover and permafrost decrease channel mobility, increase shoreline roughness, and route and deposit more sediment offshore. Ice cover also enhances overbank deposition, increasing subaerial delta elevations. Furthermore, our modelling suggests that permafrost and ice loss in a warming climate could lead to less overbank and offshore deposition and more dynamic and spatially distributed fluxes of water and sediment across Arctic river deltas. |
author |
Lauzon, Rebecca Elizabeth Piliouras, Anastasia Rowland, Joel C. |
author_facet |
Lauzon, Rebecca Elizabeth Piliouras, Anastasia Rowland, Joel C. |
author_sort |
Lauzon, Rebecca Elizabeth |
title |
Ice and permafrost effects on delta morphology and channel dynamics |
title_short |
Ice and permafrost effects on delta morphology and channel dynamics |
title_full |
Ice and permafrost effects on delta morphology and channel dynamics |
title_fullStr |
Ice and permafrost effects on delta morphology and channel dynamics |
title_full_unstemmed |
Ice and permafrost effects on delta morphology and channel dynamics |
title_sort |
ice and permafrost effects on delta morphology and channel dynamics |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1525858 https://www.osti.gov/biblio/1525858 https://doi.org/10.1029/2019GL082792 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Sea ice |
genre_facet |
Arctic Ice permafrost Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1525858 https://www.osti.gov/biblio/1525858 https://doi.org/10.1029/2019GL082792 doi:10.1029/2019GL082792 |
op_doi |
https://doi.org/10.1029/2019GL082792 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
12 |
container_start_page |
6574 |
op_container_end_page |
6582 |
_version_ |
1772811678994399232 |