Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
12
Published: March 10, 2025
This
study
conducted
laboratory
experiments
to
investigate
the
bedload
transport
within
a
patchy
submerged
canopy
across
range
of
patch
area
densities
and
spatial
configurations.
The
(
ϕp
),
defined
as
bed
fraction
covered
by
patches,
ranged
from
0
0.56,
while
configurations
varied
channel-spanning
patches
laterally
unconfined
patches.
At
low
density
id="im2">ϕp<
0.3),
id="im3">ϕp
increased,
more
flow
passed
over
top
canopy,
decreasing
near-bed
velocity.
However,
formation
turbulent
wakes
around
individual
increased
kinetic
energy
(TKE).
These
opposing
trends
led
mild
decrease
in
rate
with
increasing
id="im4">ϕp
.
In
contrast,
at
high
id="im5">ϕp>
both
velocity
TKE
decreased
id="im6">ϕp
,
resulting
sharp
rate.
Furthermore,
same
id="im7">ϕp
were
associated
lower
transport,
compared
A
predictive
model
for
that
incorporated
mean
provided
accurate
predictions
than
models
based
only
on
time-averaged
(bed
stress)
or
TKE.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(4)
Published: April 1, 2024
Abstract
Vegetation
is
an
essential
component
of
natural
rivers
and
has
significant
effects
on
flow
morphodynamic
processes.
Although
progress
been
made
in
characterizing
resistance
vegetated
flows,
the
impact
vegetation
bed
shear
stress,
a
key
driver
sediment
transport,
still
needs
better
characterization
understanding.
This
research,
explores
stress
near‐bed
characteristics
sparse
arrays
rigid
emergent
cylinders
mimicking
over
rough
bed.
For
this
purpose,
novel
adaptation
plate
was
used
to
measure
at
canopy
scale.
These
measurements
were
analyzed
relation
spatially
averaged
quantities
for
different
array
densities.
The
results
show
that,
constant
water
depth,
investigated
cylinder
enhances
ratio
between
bulk
velocity
(i.e.,
Darcy‐Weisbach
friction
factor)
compared
unobstructed
open‐channel
that
increases
with
density.
Moreover,
higher
velocities
observed
On
other
hand,
no
influence
values
turbulent
kinetic
energy
stresses
observed.
Finally,
it
shown
thickness
layer
suitable
parameter
scale
flows.
Journal of Hydrology and Hydromechanics,
Journal Year:
2025,
Volume and Issue:
73(1), P. 84 - 94
Published: March 1, 2025
Abstract
Abstract:
The
discontinuous
instream
plants,
which
have
progressively
emerged
as
potentially
advantageous
ecomorphologic
engineers
capable
of
changing
hydraulics,
enhancing
ecosystem
resilience,
and
influencing
sediment
deposition,
usually
grow
seasonally.
Thus,
understanding
the
feedback
flow
fields
deposition
to
density
length
vegetation
patches
is
essential
in
exploring
geomorphic
role
due
its
seasonal
evolution
natural
rivers.
In
this
study,
we
conducted
flume
experiments
clarify
interaction
mechanisms
between
hydraulics
suspended
emergent
patches.
Results
validated
with
field
data
demonstrate
that
modify
velocity
turbulence,
significantly
along
streamwise
direction.
Within
region,
represented
by
L
i
,
enhanced
turbulence
induced
were
found
reduce
sedimentation,
while
increased
interval
regions.
pattern
different
lengths
(
v
)
reveals
expansive
effects
upstream
patch
on
downstream
regions
densities.
When
/L
>
1,
sufficiently
long
extend
turbulent
eddies
originated
from
dense
patches,
restricts
leads
decreased
compared
scenario
without
vegetation.
However,
effect
recedes
increase
length.
Conversely,
sparse
enhances
total
magnitude
when
zones
small.
<
observed
both
scenarios.
Frontiers in Marine Science,
Journal Year:
2025,
Volume and Issue:
12
Published: March 10, 2025
This
study
conducted
laboratory
experiments
to
investigate
the
bedload
transport
within
a
patchy
submerged
canopy
across
range
of
patch
area
densities
and
spatial
configurations.
The
(
ϕp
),
defined
as
bed
fraction
covered
by
patches,
ranged
from
0
0.56,
while
configurations
varied
channel-spanning
patches
laterally
unconfined
patches.
At
low
density
id="im2">ϕp<
0.3),
id="im3">ϕp
increased,
more
flow
passed
over
top
canopy,
decreasing
near-bed
velocity.
However,
formation
turbulent
wakes
around
individual
increased
kinetic
energy
(TKE).
These
opposing
trends
led
mild
decrease
in
rate
with
increasing
id="im4">ϕp
.
In
contrast,
at
high
id="im5">ϕp>
both
velocity
TKE
decreased
id="im6">ϕp
,
resulting
sharp
rate.
Furthermore,
same
id="im7">ϕp
were
associated
lower
transport,
compared
A
predictive
model
for
that
incorporated
mean
provided
accurate
predictions
than
models
based
only
on
time-averaged
(bed
stress)
or
TKE.
