Meandering Of A Particle-laden Rivulet
Author(s)
P. Vorobieff, A. Mammoli, J. Coonrod, V. Putkaradze
& K. Mertens
Abstract
The behavior of a rivulet flowing down an incline is a fundamental problem in
hydrodynamics, with many important applications in water resources engineering,
largely because of its connection with natural meandering flows (rivers and
streams). Recent advances in the understanding of laboratory rivulet flows reveal
several important features of the rivulet behavior that are directly relevant to this
connection with natural flows. Rivulet meandering is triggered by irregularities in
the flow rate at the origin, and amplified by re-absorption of droplets left on the
inclined surface by the previous meanderings. This leads to a statistically nontrivial
behavior, with the spectrum of an ensemble of rivulet deviations from its
centreline obeying a power law. Some of the statistics of the laboratory rivulets
(e.g., the area swept by the rivulet) closely resemble those of real rivers (Hack’s
law). However, there are many important physical differences between rivulets
and real rivers. Among them is the fact that the flow in real rivers and streams
is often multiphase (sediment-laden). Here we present the results of laboratory
experimentswith rivulets, where the flow down an inclined, partially wetting plane
carries a well-characterized particulate to model sediment flow. The most notable
change produced by the addition of the particles is the formation of a stationary
meandering pattern, which does not occur under the same conditions for the flow
without particles.
Keywords: meandering, free-surface flow, flow with particles, rivulet.
Keywords
meandering, free-surface flow, flow with particles, rivulet
Related Book
Other papers in this volume
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