Ice and permafrost effects on delta morphology and channel dynamics
Abstract
Abstract 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. Our modeling 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.
- Authors:
-
[1];
[2];
[2]
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Duke Univ., Durham, NC (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1525858
- Alternate Identifier(s):
- OSTI ID: 1560206
- Report Number(s):
- LA-UR-19-22258
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 46; Journal Issue: 12; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Earth Sciences; delta; ice; permafrost; Arctic; modeling
Citation Formats
Lauzon, Rebecca Elizabeth, Piliouras, Anastasia, and Rowland, Joel C. Ice and permafrost effects on delta morphology and channel dynamics. United States: N. p., 2019.
Web. doi:10.1029/2019GL082792.
Lauzon, Rebecca Elizabeth, Piliouras, Anastasia, & Rowland, Joel C. Ice and permafrost effects on delta morphology and channel dynamics. United States. https://doi.org/10.1029/2019GL082792
Lauzon, Rebecca Elizabeth, Piliouras, Anastasia, and Rowland, Joel C. Thu .
"Ice and permafrost effects on delta morphology and channel dynamics". United States. https://doi.org/10.1029/2019GL082792. https://www.osti.gov/servlets/purl/1525858.
@article{osti_1525858,
title = {Ice and permafrost effects on delta morphology and channel dynamics},
author = {Lauzon, Rebecca Elizabeth and Piliouras, Anastasia and Rowland, Joel C.},
abstractNote = {Abstract 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. Our modeling 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.},
doi = {10.1029/2019GL082792},
journal = {Geophysical Research Letters},
number = 12,
volume = 46,
place = {United States},
year = {Thu Jun 06 00:00:00 EDT 2019},
month = {Thu Jun 06 00:00:00 EDT 2019}
}
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