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Related Experiment Videos

Bed load transport by submerged jets.

J R Francis1, P S McCreath

  • 1Imperial College of Science and Technology, London SW 7, England.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1979
PubMed
Summary

Similarities in bed load transport were found between river systems and jet-induced scour. Empirical relationships governing erosion are comparable despite differing geometries, using the stream-power concept.

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Area of Science:

  • Geology
  • Fluid Dynamics
  • Sediment Transport

Background:

  • Bed load transport is crucial in river systems and local scour phenomena.
  • Understanding erosion dynamics is key for hydraulic engineering and environmental management.
  • Jet-induced scour presents complex fluid-sediment interactions.

Purpose of the Study:

  • To investigate and compare the bed load transport mechanisms in river systems and jet-induced scour.
  • To evaluate the initial erosion rates in a sand bed subjected to a submerged slot nozzle.
  • To determine if a unified concept like stream-power can describe both phenomena.

Main Methods:

  • Experimental setup involving a submerged two-dimensional slot nozzle eroding a deep sand bed.
  • Measurement of erosion rates at the onset of scour.
  • Comparison of experimental data with river data using the stream-power concept.

Main Results:

  • Identified similarities in the bed load transport of noncohesive grains between riverine and local scour environments.
  • Established empirical relationships for erosion that are comparable for both cases.
  • Demonstrated the applicability of the stream-power concept to initial scour rates.

Conclusions:

  • The fundamental principles governing bed load transport and erosion share commonalities across different scales and geometries.
  • Stream-power offers a unifying metric for understanding initial erosion in both riverine and jet-induced scour scenarios.
  • Despite geometric differences, the physics of sediment transport under certain conditions exhibit similar empirical relationships.

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