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Title: Ice and permafrost effects on delta morphology and channel dynamics

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. 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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Duke Univ., Durham, NC (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
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. doi: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. doi:10.1029/2019GL082792.
@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 = {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.},
doi = {10.1029/2019GL082792},
journal = {Geophysical Research Letters},
number = 12,
volume = 46,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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