An instability theory for the formation of ribbed moraine, drumlins and mega-scale glacial lineations

dc.contributor.authorFowler, Andrew Cadle, 1953-
dc.contributor.authorChapwanya, Michael
dc.date.accessioned2015-06-24T06:34:22Z
dc.date.available2015-06-24T06:34:22Z
dc.date.issued2014-11
dc.description.abstractWe present a theory for the coupled ow of ice, subglacial water, and sub- glacial sediment, which is designed to represent the processes which occur at the bed of an ice sheet. The ice is assumed to ow as a Newtonian viscous uid, the water can ow between the till and the ice as a thin lm, which may thicken to form streams or cavities, and the till is assumed to be transported, either through shearing by the ice, squeezing by pressure gradients in the till, or by uvial sediment transport processes in streams or cavities. In previous studies, it was shown that the dependence of ice sliding veloc- ity on e ective pressure provided a mechanism for the generation of bedforms resembling ribbed moraine, while the dependence of uvial sediment transport on water lm depth provides a mechanism for the generation of bedforms re- sembling mega-scale glacial lineations (MSGL). Here we combine these two processes in a single model, and show that, depending largely on the granulom- etry of the till, instability can occur in a range of types which range from ribbed moraine through three-dimensional drumlins to mega-scale glacial lineations.en_ZA
dc.description.embargo2015-11-30en_ZA
dc.description.librarianhb2015en_ZA
dc.description.sponsorshipScience Foundation Ireland PI grant 12/1A/1683.en_ZA
dc.description.urihttp://rspa.royalsocietypublishing.orgen_ZA
dc.identifier.citationFowler, AC & Chapwanya, M 2014, 'An instability theory for the formation of ribbed moraine, drumlins and mega-scale glacial lineations', Proceedings of The Royal Society A : Mathematical, Physical and Engineering Science, vol. 470, no. 2171.en_ZA
dc.identifier.issn1364-5021 (print)
dc.identifier.issn1471-2946 (online)
dc.identifier.other10.1098/rspa.2014.0185
dc.identifier.urihttp://hdl.handle.net/2263/45696
dc.language.isoenen_ZA
dc.publisherThe Royal Societyen_ZA
dc.rights© 2014 The Author(s) Published by the Royal Society. All rights reserved.en_ZA
dc.subjectDrumlinsen_ZA
dc.subjectRibbed moraineen_ZA
dc.subjectInstabilityen_ZA
dc.subjectMega-scale glacial lineations (MSGL)en_ZA
dc.titleAn instability theory for the formation of ribbed moraine, drumlins and mega-scale glacial lineationsen_ZA
dc.typePostprint Articleen_ZA

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Fowler_Instability_2014.pdf
Size:
3.33 MB
Format:
Adobe Portable Document Format
Description:
Postprint Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: