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- W2048680003 abstract "Abstract The aim of this paper is to discuss the origin of a linear boulder deposit near the Mjolkedalsbreen, Jotunheimen, Norway. Subglacial fluvial deposition is suggested by palaeoflow indicators showing flow directions uphill along the axis of a ridge-like deposit and the close association of this deposit with an ice-contact boulder delta. Peak discharges of repeated jokulhlaups from the former ice-dammed Ovre Mjolkedalsvatn were estimated at 1188 m3 s-1 using evidence derived from the proglacial jokulhlaup routeway. Former ice-tunnel dimensions and flow conditions associated with the ridge-like deposit were derived from a simple pipe-flow equation. Flow velocities of 9.8–11.6 m s-1 and shear stresses of 1440–2018 N m2 were reconstructed for a tunnel less than 3 m in average height and 45 m wide. Such flows would have been capable of transporting boulders of greater than 3 m in diameter as traction load and material of gravel-cobble size in suspension. Material of this size has been deposited downflow as an ice-contact delta. Linear ridges of boulder gravel with up-slope gradients found in association with ice-contact deposits in other formerly glaciated areas may similarly be of jokulhlaup origin." @default.
- W2048680003 created "2016-06-24" @default.
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- W2048680003 date "1994-06-01" @default.
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- W2048680003 title "Subglacial jökulhlaup deposition, Jotunheimen, Norway" @default.
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- W2048680003 doi "https://doi.org/10.1016/0037-0738(94)90126-0" @default.
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