globalchange  > 气候减缓与适应
DOI: 10.1016/j.quascirev.2017.11.027
Scopus记录号: 2-s2.0-85037064327
论文题名:
Terminal zone glacial sediment transfer at a temperate overdeepened glacier system
作者: Swift D.A.; Cook S.J.; Graham D.J.; Midgley N.G.; Fallick A.E.; Storrar R.; Toubes Rodrigo M.; Evans D.J.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 180
起始页码: 111
结束页码: 131
语种: 英语
英文关键词: Europe ; Geomorphology ; Glacial ; Glacial erosion ; Glacial hydrology ; Glaciation ; Glaciology ; Present ; Quaternary ; Sediment transport
Scopus关键词: Budget control ; Debris ; Deformation ; Erosion ; Geomorphology ; Glacial geology ; Hydrology ; Sediment transport ; Sedimentation ; Sediments ; Europe ; Glacial ; Glacial erosion ; Glacial hydrology ; Glaciation ; Glaciology ; Present ; Quaternary ; Ice ; alluvial deposit ; basal ice ; bedload ; bedrock ; deformation ; geomorphology ; glacial deposit ; glacial erosion ; glacial hydrology ; glaciation ; landscape evolution ; moraine ; Quaternary ; sediment transport ; size distribution ; thrust ; Europe ; Iceland ; Svinafellsjokull
英文摘要: Continuity of sediment transfer through glacial systems is essential to maintain subglacial bedrock erosion, yet transfer at temperate glaciers with overdeepened beds, where subglacial fluvial sediment transport should be greatly limited by adverse slopes, remains poorly understood. Complex multiple transfer processes in temperate overdeepened systems has been indicated by the presence of large frontal moraine systems, supraglacial debris of mixed transport origin, thick basal ice sequences, and englacial thrusts and eskers. At Svínafellsjökull, thrusts comprising decimetre-thick debris-rich bands of stratified facies ice of basal origin, with a coarser size distribution and higher clast content than that observed in basal ice layers, contribute substantially to the transfer of subglacial material in the terminal zone. Entrainment and transfer of material occurs by simple shear along the upper surface of bands and by strain-induced deformation of stratified and firnified glacier ice below. Thrust material includes rounded and well-rounded clasts that are also striated, indicating that fluvial bedload is deposited as subglacial channels approach the overdeepening and then entrained along thrusts. Substantial transfer also occurs within basal ice, with facies type and debris content dependent on the hydrological connectedness of the adverse slope. A process model of transfer at glaciers with terminal overdeepenings is proposed, in which the geometry of the overdeepening influences spatial patterns of ice deformation, hydrology, and basal ice formation. We conclude that the significance of thrusting in maintaining sediment transfer continuity has likely been overlooked by glacier sediment budgets and glacial landscape evolution studies. © 2017 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112337
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作者单位: Department of Geography, University of Sheffield, Winter Street, Sheffield, S10 2TN, United Kingdom; Geography, School of Social Sciences, University of Dundee, Nethergate, Dundee, DD1 4HN, United Kingdom; Polar and Alpine Research Centre, Department of Geography, Loughborough University, Leicestershire, LE11 3TU, United Kingdom; School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Nottinghamshire, NG25 0QF, United Kingdom; Scottish Universities Environmental Research Centre, East Kilbride, Glasgow, G75 OQF, United Kingdom; Department of the Natural and Built Environment, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, United Kingdom; School of Science and the Environment, Manchester Metropolitan University, Manchester, M1 5GD, United Kingdom; Department of Geography, Durham University, South Road, Durham, DH1 3LE, United Kingdom

Recommended Citation:
Swift D.A.,Cook S.J.,Graham D.J.,et al. Terminal zone glacial sediment transfer at a temperate overdeepened glacier system[J]. Quaternary Science Reviews,2018-01-01,180
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