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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Icelandic jökulhlaup impacts: Implications for ice-sheet hydrology, sediment transfer and geomorphology
Geomorphology, Volume 75, No. 1-2 SPEC. ISS., Year 2006
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Description
Glaciers and ice sheets erode, entrain, and deposit massive quantities of debris. Fluxes of subglacial meltwater exert a fundamental control on ice dynamics and sediment transport budgets. Within many glacial systems outburst floods (jökulhlaups) constitute high magnitude, high frequency fluxes of meltwater relative to normal ablation controlled discharge. This paper presents a synthesis of research on recent Icelandic jökulhlaups and their geomorphological and sedimentary impact. We identify jökulhlaup impacts within subglacial, englacial and proglacial settings and discuss their wider significance for ice sheet hydrology, sediment transfer and geomorphology. Because jökulhlaups erode, deposit, and re-work sediment simultaneously, they usually cause significant glaciological and sedimentological impacts. Jökulhlaups that propagate as subglacial flood waves often produce widespread hydromechanical disruption at the glacier base. Recent Icelandic jökulhlaups have been recognised as highly efficient agents of reworking subglacial sediment and glacial sediment entrainment. Models of jökulhlaup impact, therefore, need to encompass the sub- and englacial environment in addition to the proglacial zone where research has traditionally been focussed. Most jökulhlaups transport sediment to proglacial sandar, and often directly to oceans where preservation potential of the impact is greater. Proglacial jökulhlaup deposits form distinctive sedimentary assemblages, coupled with suites of high-energy erosional landforms. This study of modern jökulhlaup processes and sedimentary products may be useful for the interpretation of meltwater processes associated with Quaternary ice sheets. © 2005 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Russell, Andrew J.
United Kingdom, Newcastle
Faculty of Humanities and Social Sciences
Roberts, Matthew J.
Iceland, Reykjavik
Icelandic Meteorological Office
Fay, Helen
United Kingdom, Lancaster
Lancaster University
Marren, Philip M.
South Africa, Johannesburg
University of the Witwatersrand
Cassidy, Nigel J.
United Kingdom, Keele
Keele University
Tweed, Fiona S.
United Kingdom, Stoke-on-trent
Staffordshire University
Harris, Tim D.
United Kingdom, Stoke-on-trent
Staffordshire University
Statistics
Citations: 122
Authors: 7
Affiliations: 6
Identifiers
Doi:
10.1016/j.geomorph.2005.05.018
ISSN:
0169555X