Theoretical Study on Breaking of Waves on Antidunes

  1. William McCaffrey,
  2. Ben Kneller and
  3. Jeff Peakall
  1. Y. Kubo1,† and
  2. M. Yokokawa2

Published Online: 17 MAR 2009

DOI: 10.1002/9781444304275.ch4

Particulate Gravity Currents

Particulate Gravity Currents

How to Cite

Kubo, Y. and Yokokawa, M. (2001) Theoretical Study on Breaking of Waves on Antidunes, in Particulate Gravity Currents (eds W. McCaffrey, B. Kneller and J. Peakall), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304275.ch4

Editor Information

  1. School of Earth Sciences, University of Leeds, Leeds, LS2 9JT, West Yorkshire, UK

Author Information

  1. 1

    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

  2. 2

    Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan

  1. Deep-Sea Research Department, Japan Marine Science and Technology Centre (JAMSTEC) 2-15 Natsushima-cho, Yokosuka 237-0061 Japan

Publication History

  1. Published Online: 17 MAR 2009
  2. Published Print: 24 APR 2001

ISBN Information

Print ISBN: 9780632059218

Online ISBN: 9781444304275

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Keywords:

  • theoretical study on breaking of waves on antidunes;
  • antidunes - bedforms produced under high flow intensities of upper flow regime and upstream migration against flow;
  • breaking of waves on antidunes;
  • deposition caused by hydraulic jump;
  • application to density currents;
  • sequence of events observed with waves breaking on antidunes

Summary

Breaking of waves on antidunes is modelled by considering the hydraulics of a supercritical flow over an obstacle. A supercritical flow tends to convert an initially flat bed into bedwaves, which in turn prevent smooth passage of the flow. The flow is blocked, and a hydraulic jump is formed over the crest of the bedwaves. A turbulent hydraulic jump moves upstream with a cloud of suspension, resulting in deposition on the upstream side of the antidunes. With enough sediment transport, upstream-dipping laminae or lenticular structures are formed. This cycle of events observed in antidune sedimentation is matched with a hydraulic description of flow over an obstacle.