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• W1991092005 abstract "This paper discusses the main causes and characteristics of jökulhlaup (‘glacier burst’) floods, and explores the extent to which they generate depositional landform and sediment assemblages that are distinct from those of ‘normal’, braided river outwash (‘Type I’ outwash). Two main jökulhlaup outwash environments are identified: Type II outwash, produced by sudden drainage of ice-dammed lakes; and Type III, associated with drainage during subglacial geothermal activity, and distinguished by deposits resulting from high sediment concentrations and hyperconcentrated flows. In fluid flows, especially ones yielding Type II outwash, the most common deposits are large-scale expansion bars (and locally, eddy and pendant bars), and ‘mega-ripples’ or dunes, both forms normally composed of large-scale gravel-cobble cross-bedding, often capped by an imbricated boulder lag (a ‘Type B2’ lithofacies sequence). The armour is absent only where runoff decreased too rapidly to allow surface winnowing. Other jökulhlaup facies include extensive boulder beds (Type C), inverse-normally graded cobble beds (Type DS), ice-proximal debris flow deposits and deformed bedding containing diamicton clasts (Types G and H), and slack-water sediments (Type A). Type III outwash is dominated by massive, homogeneous, flood surge granules, underlain by pre-surge gravels, and capped by post-surge fluid bedforms, reflecting deposition during both the rising and falling limbs of the flood hydrograph (Type E4). The paper demonstrates that jökulhlaups do generate distinctive assemblages of depositional landforms and sediments, and concludes with a model of the dominant lithofacies sequences and associated landforms in proglacial environments subject to jökulhlaup drainage." @default.
• W1991092005 created "2016-06-24" @default.
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• W1991092005 date "1997-01-01" @default.
• W1991092005 modified "2023-10-16" @default.
• W1991092005 title "Jökulhlaup deposits in proglacial areas" @default.
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• W1991092005 doi "https://doi.org/10.1016/s0277-3791(97)00023-1" @default.
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