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Bar-top hollows: A new element in the architecture of sandy braided rivers |
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| Authors: | Jim Best John Woodward Phil Ashworth Greg Sambrook Smith Chris Simpson |
| Institution: | aEarth and Biosphere Institute, School of Earth and Environment, University of Leeds, Leeds, West Yorkshire LS2 9JT, UK bDivision of Geography, School of Applied Sciences, Northumbria University, Ellison Building, Newcastle upon Tyne, NE1 8ST, UK cDivision of Geography, School of Environment, University of Brighton, Lewes Road, Brighton, Sussex BN2 4GJ, UK dSchool of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK eDepartment of Geography, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6 |
| 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. |
| Keywords: | Bar-top hollows Braided rivers Ground penetrating radar South Saskatchewan River |
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