Subglacial bedform morphology controlled by ice speed and sediment thickness.
Subglacial bedforms (drumlins, ribbed moraines, mega-scale glacial lineations) are enigmatic repetitive flow-parallel and flow-transverse landforms common in glaciated landscapes. Their evolution and morphology are a potentially powerful constraint for ice sheet modelling, but there is little consen...
Published in: | Geophysical Research Letters |
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American Geophysical Union
2016
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Online Access: | http://dro.dur.ac.uk/19256/ http://dro.dur.ac.uk/19256/1/19256.pdf http://dro.dur.ac.uk/19256/2/19256.pdf https://doi.org/10.1002/2016GL069558 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:19256 2023-05-15T16:40:49+02:00 Subglacial bedform morphology controlled by ice speed and sediment thickness. Barchyn, T.E. Dowling, T.P.F. Stokes, C.R. Hugenholtz, C.G. 2016-07-30 application/pdf http://dro.dur.ac.uk/19256/ http://dro.dur.ac.uk/19256/1/19256.pdf http://dro.dur.ac.uk/19256/2/19256.pdf https://doi.org/10.1002/2016GL069558 unknown American Geophysical Union dro:19256 issn:0094-8276 issn: 1944-8007 doi:10.1002/2016GL069558 http://dro.dur.ac.uk/19256/ http://dx.doi.org/10.1002/2016GL069558 http://dro.dur.ac.uk/19256/1/19256.pdf http://dro.dur.ac.uk/19256/2/19256.pdf Thomas E. Barchyn, Thomas P. F. Dowling, Chris R. Stokes, Chris H. Hugenholtz (2016), Subglacial bedform morphology controlled by ice speed and sediment thickness, Geophysical research letters, 43(14): 7572-7580, 10.1002/2016GL069558 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI. Geophysical research letters, 2016, Vol.43(14), pp.7572-7580 [Peer Reviewed Journal] Article PeerReviewed 2016 ftunivdurham https://doi.org/10.1002/2016GL069558 2020-06-11T22:23:35Z Subglacial bedforms (drumlins, ribbed moraines, mega-scale glacial lineations) are enigmatic repetitive flow-parallel and flow-transverse landforms common in glaciated landscapes. Their evolution and morphology are a potentially powerful constraint for ice sheet modelling, but there is little consensus on bedform dynamics or formative mechanisms. Here we explore shallow sediment bedform dynamics via a simple model that iterates: (i) down-flow till flux, (ii) pressure gradient driven till flux, and (iii) entrainment and deposition of sediment. Under various boundary conditions, replicas of subglacial bedforms readily emerge. Bedform dynamics mirror those in subaqueous and aeolian domains. Transitions between ribbed moraines and elongate flow-parallel bedforms are associated with increasing ice speeds and declining sediment thickness. These simulations provide quantitative flux estimates and suggest that widely observed transitions in shallow sediment subglacial bedforms (e.g., ribbed moraines to drumlinoids to mega-scale glacial lineations) are manifestations of subtle variations in ice velocity and sediment thickness. Article in Journal/Newspaper Ice Sheet Durham University: Durham Research Online Geophysical Research Letters 43 14 7572 7580 |
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Open Polar |
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Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
description |
Subglacial bedforms (drumlins, ribbed moraines, mega-scale glacial lineations) are enigmatic repetitive flow-parallel and flow-transverse landforms common in glaciated landscapes. Their evolution and morphology are a potentially powerful constraint for ice sheet modelling, but there is little consensus on bedform dynamics or formative mechanisms. Here we explore shallow sediment bedform dynamics via a simple model that iterates: (i) down-flow till flux, (ii) pressure gradient driven till flux, and (iii) entrainment and deposition of sediment. Under various boundary conditions, replicas of subglacial bedforms readily emerge. Bedform dynamics mirror those in subaqueous and aeolian domains. Transitions between ribbed moraines and elongate flow-parallel bedforms are associated with increasing ice speeds and declining sediment thickness. These simulations provide quantitative flux estimates and suggest that widely observed transitions in shallow sediment subglacial bedforms (e.g., ribbed moraines to drumlinoids to mega-scale glacial lineations) are manifestations of subtle variations in ice velocity and sediment thickness. |
format |
Article in Journal/Newspaper |
author |
Barchyn, T.E. Dowling, T.P.F. Stokes, C.R. Hugenholtz, C.G. |
spellingShingle |
Barchyn, T.E. Dowling, T.P.F. Stokes, C.R. Hugenholtz, C.G. Subglacial bedform morphology controlled by ice speed and sediment thickness. |
author_facet |
Barchyn, T.E. Dowling, T.P.F. Stokes, C.R. Hugenholtz, C.G. |
author_sort |
Barchyn, T.E. |
title |
Subglacial bedform morphology controlled by ice speed and sediment thickness. |
title_short |
Subglacial bedform morphology controlled by ice speed and sediment thickness. |
title_full |
Subglacial bedform morphology controlled by ice speed and sediment thickness. |
title_fullStr |
Subglacial bedform morphology controlled by ice speed and sediment thickness. |
title_full_unstemmed |
Subglacial bedform morphology controlled by ice speed and sediment thickness. |
title_sort |
subglacial bedform morphology controlled by ice speed and sediment thickness. |
publisher |
American Geophysical Union |
publishDate |
2016 |
url |
http://dro.dur.ac.uk/19256/ http://dro.dur.ac.uk/19256/1/19256.pdf http://dro.dur.ac.uk/19256/2/19256.pdf https://doi.org/10.1002/2016GL069558 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geophysical research letters, 2016, Vol.43(14), pp.7572-7580 [Peer Reviewed Journal] |
op_relation |
dro:19256 issn:0094-8276 issn: 1944-8007 doi:10.1002/2016GL069558 http://dro.dur.ac.uk/19256/ http://dx.doi.org/10.1002/2016GL069558 http://dro.dur.ac.uk/19256/1/19256.pdf http://dro.dur.ac.uk/19256/2/19256.pdf |
op_rights |
Thomas E. Barchyn, Thomas P. F. Dowling, Chris R. Stokes, Chris H. Hugenholtz (2016), Subglacial bedform morphology controlled by ice speed and sediment thickness, Geophysical research letters, 43(14): 7572-7580, 10.1002/2016GL069558 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI. |
op_doi |
https://doi.org/10.1002/2016GL069558 |
container_title |
Geophysical Research Letters |
container_volume |
43 |
container_issue |
14 |
container_start_page |
7572 |
op_container_end_page |
7580 |
_version_ |
1766031239339311104 |