Abstract
A previously unreported shock feature associated with the scouring
of a horizontal
granular bed by a dam-break wave is discussed. Near the wave centre, the
present
study shows, the free surface breaks backward and a hydraulic jump forms.
This behaviour
is described from the standpoint of shallow-water theory, suitably extended
to deal with non-equilibrium sediment transport. The shock formation involves
a
particularly strong coupling between flow free-surface evolution and bed
morphodynamics.
Support for our conclusions is sought through experimental and numerical
approaches. In order to magnify the observed phenomena, measurements were
performed
for the case of light bed particles moving in sheet and debris flow modes.
A detailed picture of the transient two-phase flow is presented, based
on whole
field acquisition of the grain motions by particle tracking techniques.
Corresponding
shallow-water solutions are constructed numerically using a shock capturing
scheme.
Finally, an interpretation of the jump formation is proposed based on the
theory of
characteristics.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
161 articles.
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