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Subglacial swamps

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Show simple item record Kyrke-Smith, T.M. Fowler, Andrew C. 2018-12-04T11:23:19Z 2018-12-04T11:23:19Z 2014
dc.description peer-reviewed en_US
dc.description.abstract The existence of both water and sediment at the bed of ice streams is well documented, but there is a lack of fundamental understanding about the mechanisms of ice, water and sediment interaction. We pose a model to describe subglacial water flow below ice sheets, in the presence of a deformable sediment layer. Water flows in a rough-bedded film; the ice is supported by larger clasts, but there is a millimetric water layer submerging the smaller particles. Partial differential equations describing the water film are derived from a description of the dynamics of ice, water and mobile sediment. We assume that sediment transport is possible, either as fluvial bedload, but more significantly by ice-driven shearing and by internal squeezing. This provides an instability mechanism for rivulet formation; in the model, downstream sediment transport is compensated by lateral squeezing of till towards the incipient streams. We show that the model predicts the formation of shallow, swamp-like streams, with a typical depth of the order of centimetres. The swamps are stable features, typically with a width of the order of tens to hundreds of metres. en_US
dc.language.iso eng en_US
dc.relation 121A1683 en_US
dc.relation.ispartofseries Proceedings of the Royal Society A;470:20140340
dc.subject subglacial hydrology en_US
dc.subject canals en_US
dc.subject Smith-Bretherton instability en_US
dc.subject sediment-floored channels en_US
dc.title Subglacial swamps en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US 2018-12-04T11:17:38Z
dc.description.version PUBLISHED
dc.identifier.doi 10.1098/rspa.2014.0340
dc.identifier.doi 10.1098/rspa.2014.0340
dc.contributor.sponsor Natural Environment Research Council en_US
dc.contributor.sponsor SFI en_US
dc.relation.projectid NE/I528485/1 en_US
dc.relation.projectid 12/1A/1683 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 1573206
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Proceedings Of The Royal Society A-Mathematical Physical And Engineering Sciences
dc.description.status peer-reviewed

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