Critical discharge for entrainment of poorly sorted gravel

Critical discharge for entrainment of poorly sorted gravel Entrainment criteria for gravel‐sized particles on river beds are usually defined in terms of shear stress, but some workers have proposed that critical‐discharge relationships are more reliable and more convenient. The critical shear stress in poorly sorted gravels is known from recent work to depend much more on relative than absolute grain size. It is shown that this effect can be included in a semi‐theoretical equation for the critical unit discharge to move individual grain sizes in a poorly sorted bed. Comparisons with published data on critical discharges in a variety of rivers show that both the sensitivity of critical discharge to grain size, and the absolute levels of critical discharge, are predicted quite well. However, any prediction of critical discharge is sensitive to the assumptions made, first about flow resistance and secondly about the critical stress to move average‐sized particles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Earth Surface Processes and Landforms Wiley

Critical discharge for entrainment of poorly sorted gravel

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Publisher
Wiley
Copyright
Copyright © 1994 John Wiley & Sons, Ltd
ISSN
0197-9337
eISSN
1096-9837
D.O.I.
10.1002/esp.3290190208
Publisher site
See Article on Publisher Site

Abstract

Entrainment criteria for gravel‐sized particles on river beds are usually defined in terms of shear stress, but some workers have proposed that critical‐discharge relationships are more reliable and more convenient. The critical shear stress in poorly sorted gravels is known from recent work to depend much more on relative than absolute grain size. It is shown that this effect can be included in a semi‐theoretical equation for the critical unit discharge to move individual grain sizes in a poorly sorted bed. Comparisons with published data on critical discharges in a variety of rivers show that both the sensitivity of critical discharge to grain size, and the absolute levels of critical discharge, are predicted quite well. However, any prediction of critical discharge is sensitive to the assumptions made, first about flow resistance and secondly about the critical stress to move average‐sized particles.

Journal

Earth Surface Processes and LandformsWiley

Published: Mar 1, 1994

References

  • Palaeovelocity: a parsimonious proposal
    Church, Church; Wolcott, Wolcott; Maizels, Maizels
  • On why gravel bed streams are paved
    Parker, Parker; Klingeman, Klingeman

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