The presence of a natural pavement consisting of coarse materials
in gravel streams is of great interest with regard to fluvial hydraulics
and stream ecology. Very little information is available on the
mechanics of pavement formation and its characteristics.
In this study, insight into the characteristics of sediment transport
and pavement evolution in gravel streams was gained by means of a
physical model of a gravel stream in the Pacific Northwest. The results
from the geometrically undistorted Froude model (scale 1:8) agreed well
with the field data.
The agreement was further improved when laboratory data and field
data were compared in terms of dimensionless bedload W* and relative
Shields shear stress ¢. The W* - ¢ plots allow for the quantification
of differences in Reynolds number and roughness which were not or
could not be scaled by means of Froude similarity. The study leads to
the conclusions that bedload transport in natural gravel streams can be
simulated in the laboratory and that prototype behavior can be predicted
from laboratory data,
The experiments also illustrate that pavement can form under conditions
of continuous equilibrium transport of all available sizes of
This report was submitted in fulfillment of grant No. EPA R 806632-01.
The report covers a project period from July 5, 1979 to January 4, 1980.
A first draft of this report was submitted in April, 1980.
Corvallis Environmental Research Laboratory
Office Of Research And Development
U.s. Environmental Protection Agency
Dhamotharan, S.; Wood, A.; Parker, Gary; Stefan, Heinz.
Bedload Transport In A Model Gravel Stream.
Saint Anthony Falls Laboratory.
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