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

J.L. Best, Philip Ashworth, J. Woodward, G.H. Sambrook-Smith, C.J. Simpson

Research output: Contribution to journalArticle

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.
Original languageEnglish
Pages (from-to)241-255
Number of pages15
JournalSedimentary Geology
Volume190
Publication statusPublished - 1 Aug 2006

Keywords

  • Bar-top hollows
  • Braided rivers
  • Ground penetrating radar
  • South Saskatchewan River

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    Best, J. L., Ashworth, P., Woodward, J., Sambrook-Smith, G. H., & Simpson, C. J. (2006). Bar-top hollows: a new element in the architecture of sandy braided rivers. Sedimentary Geology, 190, 241-255.