Hydrodynamics and bed morphology in a double-layered partially vegetated mobile bed channel
Pritam Kumar,
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Abhishek Kumar,
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Anurag Sharma
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et al.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(3)
Published: March 1, 2025
This
study
investigates
the
hydrodynamics
and
sediment
transport
in
a
double-layered
partially
vegetated
mobile
bed
channel,
focusing
on
impact
of
submerged
vegetation
with
submergence
ratio
61.53%
30.77%
flow
dynamics
morphology.
Experiments
were
conducted
straight,
tilting
rectangular
flume
staggered
double
layered
covering
half
channel
width.
The
three
dimensional
time-averaged
velocity
components,
turbulent
intensities,
secondary
current,
kinetic
energy,
Reynolds
shear
stress
are
measured
analyzed
using
contour
plots
along
outcomes
reveal
that
induces
significant
momentum
exchange
between
non-vegetated
sections.
In
section,
dampens
streamwise
intensity
near
bed,
promoting
deposition
enhancing
stability.
Momentum
transfer
at
interface
strengthens
shear,
increasing
turbulence
leading
to
greater
erosion.
Negative
streamwise-vertical
indicates
helical
flow,
while
transverse-vertical
peaks
bed.
Flow
diversion
intensifies
erosion
high-energy
vegetation-induced
drag
decelerates
causing
transition
deeper
section.
Double-layered
rivers
or
canals
is
more
effective
stabilizing
materials.
These
findings
provide
critical
insight
for
river
restoration
management,
emphasizing
necessity
integrated
management
strategies
balance
across
heterogeneous
environments.
Language: Английский
Impact of mixed-height vegetation patches on energy loss in open-channel flow
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: April 1, 2025
Abstract
This
study
investigates
the
influence
of
riparian
vegetation
on
energy
losses
in
open-channel
flow,
focusing
channels
partially
covered
by
mixed-height
patches,
a
common
feature
natural
rivers
and
canals.
While
previous
research
has
primarily
focused
flow
resistance
fully
vegetated
channels,
there
been
limited
attention
to
with
unevenly
distributed
patches.
To
address
this
gap,
we
developed
an
innovative
experimental
approach
evaluate
loss
patches
under
different
submergence
conditions.
The
setup
involved
channel
varying
heights,
mimicking
natural,
uneven
distribution
results
provided
key
insights
into
velocity
turbulence
intensity
these
Furthermore,
introduced
standardized
conceptualization
method
for
ratio,
specifically
concept
effective
height
(
$${h}_{e}$$
),
standardize
calculation
methods
submerged
emergent
vegetation.Using
parameter,
derived
theoretical
formula
calculating
caused
which
closely
matched
data.
offers
reliable
framework
hydraulic
distribution.
Language: Английский
Quasi-three-dimensional calculation modeling to simulate flows and sediment transport in channels partially covered with emergent rigid vegetation
Yogi Sahat Maruli Simanjuntak,
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Tatsuhiko UCHIDA,
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Takuya INOUE
No information about this author
et al.
Physics of Fluids,
Journal Year:
2025,
Volume and Issue:
37(6)
Published: June 1, 2025
Flows
in
channels
partially
covered
with
vegetation
have
attracted
attention
due
to
their
complex
phenomena,
including
formations
of
large
coherent
structures
and
secondary
flows,
enhancing
three-dimensional
flow
characteristics.
In
this
paper,
we
developed
validated
a
quasi-3D
calculation
(quasi-3DC)
model
that
incorporates
vortex
motions
(3DVM)
into
two-dimensional
framework
as
sub-grid
simulate
flows
sediment
transport
strongly
curved
meandering
vegetation.
Before
calculations
under
movable
bed
conditions,
through
comparisons
results
from
experiments,
(2DC),
(3DC)
better
understand
the
impact
3DVM.
The
study
demonstrated
quasi-3DC
accurately
predicted
structures,
velocity
distribution,
maximum
velocity,
patterns,
emphasizing
importance
considering
Afterward,
based
on
account
for
effects
turbulent
kinetic
energy
effective
bottom
shear
stress
simulating
dynamics
vegetated
channels.
showed
promising
results,
especially
capturing
scouring
front
areas.
Language: Английский