Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model
We use a mathematical model to investigate the effect of basal topography and ice surface slope on transport and deposition of sediment within a water-filled subglacial channel. In our model, three zones of different behaviour occur. In the zone furthest upstream, variations in basal topography lead...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2022
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jog.2022.71 https://ora.ox.ac.uk/objects/uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 |
id |
ftuloxford:oai:ora.ox.ac.uk:uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 |
---|---|
record_format |
openpolar |
spelling |
ftuloxford:oai:ora.ox.ac.uk:uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 2023-05-15T16:40:28+02:00 Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model Stevens, D Ely, JC Livingstone, SJ Clark, CD Butcher, FEG Hewitt, IJ 2022-10-26 https://doi.org/10.1017/jog.2022.71 https://ora.ox.ac.uk/objects/uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 eng eng Cambridge University Press doi:10.1017/jog.2022.71 https://ora.ox.ac.uk/objects/uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 https://doi.org/10.1017/jog.2022.71 info:eu-repo/semantics/openAccess CC Attribution (CC BY) CC-BY Journal article 2022 ftuloxford https://doi.org/10.1017/jog.2022.71 2023-02-23T23:06:07Z We use a mathematical model to investigate the effect of basal topography and ice surface slope on transport and deposition of sediment within a water-filled subglacial channel. In our model, three zones of different behaviour occur. In the zone furthest upstream, variations in basal topography lead to sediment deposition under a wide range of conditions. In this first zone, even very small and gradually varying basal undulations (~5 m amplitude) can lead to the deposition of sediment within a modelled channel. Deposition is concentrated on the downstream gradient of subglacial ridges, and on the upstream gradient of subglacial troughs. The thickness and steepness of the ice sheet has a substantial impact on deposition rates, with shallow ice profiles strongly promoting both the magnitude and extent of sediment deposition. In a second zone, all sediment is transported downstream. Finally, a third zone close to the ice margin is characterised by high rates of sediment deposition. The existence of these zones has implications for esker formation and the dynamics of the subglacial environment. Article in Journal/Newspaper Ice Sheet ORA - Oxford University Research Archive Journal of Glaciology 1 13 |
institution |
Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
description |
We use a mathematical model to investigate the effect of basal topography and ice surface slope on transport and deposition of sediment within a water-filled subglacial channel. In our model, three zones of different behaviour occur. In the zone furthest upstream, variations in basal topography lead to sediment deposition under a wide range of conditions. In this first zone, even very small and gradually varying basal undulations (~5 m amplitude) can lead to the deposition of sediment within a modelled channel. Deposition is concentrated on the downstream gradient of subglacial ridges, and on the upstream gradient of subglacial troughs. The thickness and steepness of the ice sheet has a substantial impact on deposition rates, with shallow ice profiles strongly promoting both the magnitude and extent of sediment deposition. In a second zone, all sediment is transported downstream. Finally, a third zone close to the ice margin is characterised by high rates of sediment deposition. The existence of these zones has implications for esker formation and the dynamics of the subglacial environment. |
format |
Article in Journal/Newspaper |
author |
Stevens, D Ely, JC Livingstone, SJ Clark, CD Butcher, FEG Hewitt, IJ |
spellingShingle |
Stevens, D Ely, JC Livingstone, SJ Clark, CD Butcher, FEG Hewitt, IJ Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
author_facet |
Stevens, D Ely, JC Livingstone, SJ Clark, CD Butcher, FEG Hewitt, IJ |
author_sort |
Stevens, D |
title |
Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
title_short |
Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
title_full |
Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
title_fullStr |
Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
title_full_unstemmed |
Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
title_sort |
effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2022.71 https://ora.ox.ac.uk/objects/uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
doi:10.1017/jog.2022.71 https://ora.ox.ac.uk/objects/uuid:532a24d6-ad3d-4f19-812c-daa0781677f5 https://doi.org/10.1017/jog.2022.71 |
op_rights |
info:eu-repo/semantics/openAccess CC Attribution (CC BY) |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2022.71 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
13 |
_version_ |
1766030866920767488 |