Bar-top hollows: A new element in the architecture of sandy braided rivers

Best, Jim, Woodward, John, Ashworth, Phil, Sambrook Smith, Greg and Simpson, Chris (2006) Bar-top hollows: A new element in the architecture of sandy braided rivers. Sedimentary Geology, 190 (1-4). pp. 241-255. ISSN 00370738

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Official URL: http://dx.doi.org/10.1016/j.sedgeo.2006.05.022

Abstract

Discrete hollows in the bar tops of the South Saskatchewan River are described that form a newly-recognized morphological element of sandy braided rivers. These bar-top hollows, which are up to 1.7 m deep and may extend for 10-30 m down and across flow, have a circular to ovoid planform and are shown, through use of ground penetrating radar, to be filled by a series of distinct, often angle-of-repose, foresets. The hollows form by both erosion and bar-top deposition and may be generated by bar-tail accretion, cross-bar channel cutoff and subsequent fill or lateral accretion at the bar-head. Bar-top hollows occur in the upper part of the bar depositional sequence and may thus prove useful indicators for braid bar reconstruction in ancient sediments, and should not be confused with channel scour. © 2006 Elsevier B.V. All rights reserved.

Item Type: Article
Additional Information: Published online 7-7-2006 ahead of print
Uncontrolled Keywords: Bar-top hollows; Braided rivers; Ground penetrating radar; South Saskatchewan River;
Subjects: F600 Geology
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Becky Skoyles
Date Deposited: 06 Jan 2015 13:14
Last Modified: 10 Aug 2015 11:34
URI: http://nrl.northumbria.ac.uk/id/eprint/20015

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