@article{ed59e731aee64c3d902659b7f91d9253,
title = "Bar-top hollows: A new element in the architecture of sandy braided rivers",
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",
author = "Jim Best and John Woodward and Phil Ashworth and {Sambrook Smith}, Greg and Chris Simpson",
note = "Funding Information: This research was funded by UK Natural Environment Research Council Grants GR9/04273 and NER/A/S/2003/00538. We gratefully acknowledge the help and logistic support of Derald Smith, University of Calgary and thank David Ashley, School of Geography, University of Leeds, for his invaluable assistance in the field. Rob Thomas kindly processed some of the aerial photographs presented here. JLB is grateful for award of a Leverhulme Trust Research Fellowship, which was partly conducted at the Ven Te Chow Hydrosystems Laboratory, University of Illinois at Urbana-Champaign, which aided completion of this paper. The Graphics Unit at the University of Birmingham is thanked for producing some of the figures. John Shaw, Andy Russell and Colin Whiteman provided helpful and useful reviews of the manuscript for which we are grateful. John Shaw is thanked for his ideas on the possible role of hanging frazil ice and bed scour. Finally, we are indebted to Octavian Catuneanu for the opportunity to contribute to this volume and Tubby Johnson for his participation in this project. ",
year = "2006",
month = aug,
day = "1",
doi = "10.1016/j.sedgeo.2006.05.022",
language = "English (US)",
volume = "190",
pages = "241--255",
journal = "Sedimentary Geology",
issn = "0037-0738",
publisher = "Elsevier B.V.",
number = "1-4",
}