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dc.contributor.authorCraig, Melissa J.
dc.contributor.authorBaas, Jaco H.
dc.contributor.authorAmos, Kathryn J.
dc.contributor.authorStrachan, Lorna J.
dc.contributor.authorManning, Andrew J.
dc.contributor.authorPaterson, David M.
dc.contributor.authorHope, Julie A.
dc.contributor.authorNodder, Scott D.
dc.contributor.authorBaker, Megan L.
dc.identifier.citationCraig , M J , Baas , J H , Amos , K J , Strachan , L J , Manning , A J , Paterson , D M , Hope , J A , Nodder , S D & Baker , M L 2020 , ' Biomediation of submarine sediment gravity flow dynamics ' , Geology , vol. 48 , no. 1 , pp. 72-76 .
dc.identifier.otherPURE: 265896730
dc.identifier.otherPURE UUID: 6cb74a5b-5e2c-47b3-9c23-a3f54ddaba6c
dc.identifier.othercrossref: 10.1130/G46837.1
dc.identifier.otherWOS: 000505235200016
dc.identifier.otherORCID: /0000-0003-1174-6476/work/67919515
dc.identifier.otherScopus: 85078699868
dc.descriptionThe Australian Government Research Training Program Scholarship funded Craig’s Ph.D. candidature. An International Association of Sedimentologists Postgraduate Award Grant funded Craig’s visit to Bangor University (Bangor, UK). The UK Natural Environment Research Council grant NE/1027223/1 (COHBED project) enabled this research to be undertaken using the flume facility built by Rob Evans (Bangor University).en
dc.description.abstractSediment gravity flows are the primary process by which sediment and organic carbon are transported from the continental margin to the deep ocean. Up to 40% of the total marine organic carbon pool is represented by cohesive extracellular polymeric substances (EPS) produced by microorganisms. The effect of these polymers on sediment gravity flows has not been investigated, despite the economic and societal importance of these flows. We present the first EPS concentrations measured in deep-sea sediment, combined with novel laboratory data that offer insights into the modulation of the dynamics of clay-laden, physically cohesive sediment gravity flows by biological cohesion. We show that EPS can profoundly affect the character, evolution, and runout of sediment gravity flows and are as prevalent in deep oceans as in shallow seas. Transitional and laminar plug flows are more susceptible to EPS-induced changes in flow properties than turbulent flows. At relatively low concentrations, EPS markedly decrease the head velocity and runout distance of transitional flows. This biological cohesion is greater, per unit weight, than the physical cohesion of cohesive clay and may exert a stronger control on flow behavior. These results significantly improve our understanding of the effects of an unrealized biological component of sediment gravity flows. The implications are wide ranging and may influence predictive models of sediment gravity flows and advance our understanding about the ways in which these flows transport and bury organic carbon globally.
dc.rightsCopyright © 2019 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license.en
dc.subjectQE Geologyen
dc.titleBiomediation of submarine sediment gravity flow dynamicsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Sustainability Instituteen
dc.contributor.institutionUniversity of St Andrews.Coastal Resources Management Groupen
dc.contributor.institutionUniversity of St Andrews.Sediment Ecology Research Groupen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.description.statusPeer revieweden

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