Model experiments on mobile, paved gravel bed streams

Model experiments on mobile, paved gravel bed streams Laboratory experiments which model streams with poorly sorted gravel beds at reduced scale reveal that pavement is a mobile bed phenomenon. It acts to decrease the inherent difference in mobility between large and small grains by overrepresenting the percentage of large grains exposed to the flow. Pavement can coexist with the motion of all available grain sizes because motion is sporadic, so that at any given time only a small percentage of surface grains are actually in motion. Particles in the immediate subpavement are only occasionally moved, and deeper particles are hardly ever moved. The experiments were conducted at constant discharges. They provide accurate quantitative models of two field streams in that they obey the same bedload law as field data. Both sediment feed and recirculating configurations were utilized. The only systematic difference between the two is in the behavior of the finer grains. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

Model experiments on mobile, paved gravel bed streams

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Publisher
Wiley
Copyright
Copyright © 1982 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
DOI
10.1029/WR018i005p01395
Publisher site
See Article on Publisher Site

Abstract

Laboratory experiments which model streams with poorly sorted gravel beds at reduced scale reveal that pavement is a mobile bed phenomenon. It acts to decrease the inherent difference in mobility between large and small grains by overrepresenting the percentage of large grains exposed to the flow. Pavement can coexist with the motion of all available grain sizes because motion is sporadic, so that at any given time only a small percentage of surface grains are actually in motion. Particles in the immediate subpavement are only occasionally moved, and deeper particles are hardly ever moved. The experiments were conducted at constant discharges. They provide accurate quantitative models of two field streams in that they obey the same bedload law as field data. Both sediment feed and recirculating configurations were utilized. The only systematic difference between the two is in the behavior of the finer grains.

Journal

Water Resources ResearchWiley

Published: Oct 1, 1982

References

  • On why gravel bed streams are paved
    Parker, Parker; Klingeman, Klingeman

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