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...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2022
|
Subjects: | |
Online Access: | https://eprints.whiterose.ac.uk/190088/ https://eprints.whiterose.ac.uk/190088/1/effects-of-basal-topography-and-ice-sheet-surface-slope-in-a-subglacial-glaciofluvial-deposition-model.pdf |
id |
ftleedsuniv:oai:eprints.whiterose.ac.uk:190088 |
---|---|
record_format |
openpolar |
spelling |
ftleedsuniv:oai:eprints.whiterose.ac.uk:190088 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, J.C. Livingstone, S.J. Clark, C.D. Butcher, F.E.G. Hewitt, I. 2022-08-17 text https://eprints.whiterose.ac.uk/190088/ https://eprints.whiterose.ac.uk/190088/1/effects-of-basal-topography-and-ice-sheet-surface-slope-in-a-subglacial-glaciofluvial-deposition-model.pdf en eng Cambridge University Press (CUP) https://eprints.whiterose.ac.uk/190088/1/effects-of-basal-topography-and-ice-sheet-surface-slope-in-a-subglacial-glaciofluvial-deposition-model.pdf Stevens, D., Ely, J.C. orcid.org/0000-0003-4007-1500 , Livingstone, S.J. orcid.org/0000-0002-7240-5037 et al. (3 more authors) (2022) Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model. Journal of Glaciology. ISSN 0022-1430 cc_by_4 CC-BY Article PeerReviewed 2022 ftleedsuniv 2023-01-30T22:48:51Z 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 Journal of Glaciology White Rose Research Online (Universities of Leeds, Sheffield & York) |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
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, J.C. Livingstone, S.J. Clark, C.D. Butcher, F.E.G. Hewitt, I. |
spellingShingle |
Stevens, D. Ely, J.C. Livingstone, S.J. Clark, C.D. Butcher, F.E.G. Hewitt, I. Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model |
author_facet |
Stevens, D. Ely, J.C. Livingstone, S.J. Clark, C.D. Butcher, F.E.G. Hewitt, I. |
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 (CUP) |
publishDate |
2022 |
url |
https://eprints.whiterose.ac.uk/190088/ https://eprints.whiterose.ac.uk/190088/1/effects-of-basal-topography-and-ice-sheet-surface-slope-in-a-subglacial-glaciofluvial-deposition-model.pdf |
genre |
Ice Sheet Journal of Glaciology |
genre_facet |
Ice Sheet Journal of Glaciology |
op_relation |
https://eprints.whiterose.ac.uk/190088/1/effects-of-basal-topography-and-ice-sheet-surface-slope-in-a-subglacial-glaciofluvial-deposition-model.pdf Stevens, D., Ely, J.C. orcid.org/0000-0003-4007-1500 , Livingstone, S.J. orcid.org/0000-0002-7240-5037 et al. (3 more authors) (2022) Effects of basal topography and ice-sheet surface slope in a subglacial glaciofluvial deposition model. Journal of Glaciology. ISSN 0022-1430 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
_version_ |
1766030864783769600 |