Physics of Fluids,
Journal Year:
2024,
Volume and Issue:
36(4)
Published: April 1, 2024
Sediment
movements
on
the
riverbeds
are
crucial
in
fluvial
processes.
Therefore,
studying
incipient
sediment
motion
is
valuable
for
predicting
changes
behavior.
In
this
study,
influence
of
aquatic
vegetation
introduced
into
momentum
balance
equation
under
condition
a
bare
bed.
The
presented
model
open
channels
covered
by
derived,
consideration
density
and
relative
submergence.
This
study
simplifies
format.
its
coefficients
demonstrate
good
applicability
to
various
working
conditions
without
requiring
numerous
changes.
predicted
velocity
determined
proposed
validated
against
experimental
data.
Results
show
excellent
agreement
between
two
scenarios,
including
combinations
rigid
or
flexible
submerged
emergent
states.
Additionally,
observed
decrease
with
increasing
density.
However,
further
increase
may
amplify
resistance,
hindering
motion.
Meanwhile,
movement
becomes
challenging
as
water
depth
increases,
assuming
that
flow
discharge
remain
constant.
Earth-Science Reviews,
Journal Year:
2022,
Volume and Issue:
228, P. 104021 - 104021
Published: April 5, 2022
Although
the
study
of
microplastics
in
aquatic
environment
incorporates
a
diversity
research
fields,
it
is
still
its
infancy
many
aspects
while
comparable
topics
have
been
studied
other
disciplines
for
decades.
In
particular,
extensive
sedimentology
can
provide
valuable
insights
to
guide
future
research.
To
advance
our
understanding
comparability
natural
sediments
with
microplastics,
we
take
an
interdisciplinary
look
at
existing
literature
describing
particle
properties,
transport
processes,
sampling
techniques
and
ecotoxicology.
Based
on
analysis,
define
seven
goals
that
are
essential
improve
be
tackled
by
learning
from
sediment
research,
identify
relevant
tasks
achieve
each
goal.
These
address
(1)
description
microplastic
particles,
(2)
interaction
environmental
substances,
(3)
vertical
distribution
(4)
erosion
deposition
behaviour
(5)
impact
biota
transport,
(6)
methods
(7)
toxicity.
When
should
specifically
draw
knowledge
sediments,
example
using
shape
factors
or
applying
determining
principal
dimensions
non-spherical
particles.
Sediment
offers
fundamentals
transferable
could
usefully
applied.
However,
major
gaps
exist
role
modes,
influence
importance
implementation
dynamic
as
result
time-dependent
changes
properties
numerical
models.
We
give
overview
available
discuss
their
suitability
sampling,
which
used
creating
standardised
guidelines
application
microplastics.
order
comprehensively
assess
ecotoxicology
distinction
must
made
between
effects
polymers
themselves,
physical
form,
plastic-associated
chemicals
attached
pollutants.
This
review
highlights
areas
where
rely
-
need
new,
microplastic-specific
synthesize
recommendations
future,
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(12)
Published: June 14, 2024
Abstract
Bedload
sediment
transport
plays
an
important
role
in
the
evolution
of
rivers,
marshes
and
deltas.
In
these
aquatic
environments,
vegetation
is
widespread,
plant
species
have
unique
morphology.
However,
impact
real
morphology
on
flow
has
not
been
quantified.
This
study
used
model
plants
with
morphology,
based
Phragmites
australis
,
Acorus
calamus
Typha
latifolia
.
The
frontal
area
increases
away
from
bed,
which
leads
to
higher
near‐bed
velocity
than
would
be
predicted
depth‐average
area.
A
coefficient
was
defined
quantify
vertically‐varied
Laboratory
experiments
confirmed
that
improved
prediction
velocity,
turbulent
kinetic
energy
bedload
rate
canopies
realistic
Plant
can
alter
rates
by
up
order
magnitude,
relative
assumption
uniform
Water Resources Research,
Journal Year:
2021,
Volume and Issue:
57(3)
Published: Feb. 17, 2021
Abstract
Laboratory
experiments
examined
the
impact
of
model
vegetation
on
turbulence
and
resuspension.
The
turbulent
kinetic
energy
increased
with
increasing
velocity
solid
volume
fraction,
but
did
not
depend
stem
diameter.
vegetation‐generated
dominated
total
inside
canopies.
For
same
sediment
size,
critical
at
which
resuspension
was
initiated
for
both
vegetated
bare
beds,
resulted
in
a
that
decreased
fraction.
Both
had
no
dependence
However,
denser
canopies
and/or
canopy
smaller
greater
slope
is
required
to
initiate
This
study
provides
way
predict
onset
regions
vegetation,
an
important
threshold
transport
landscape
evolution.
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(7)
Published: July 1, 2024
Abstract
River
restoration
projects
often
involve
vegetation
planting
to
retain
sediment
and
stabilize
riverbanks.
Laboratory
experiments
have
explored
the
impact
of
rigid
emergent
canopies
on
bed
morphology.
Inside
canopies,
erosion
is
attributed
vegetation‐induced
turbulent
kinetic
energy
(
TKE
).
Based
in‐canopy
local
criteria
for
movement,
a
method
established
validated
predicting
length
region.
In
bare
channel,
related
ratio
canopy
flow
adjustment
distance,
L
/
I
,
exhibits
two
trends.
At
<
1,
maximum
depth,
d
s
)
length,
region
increase
with
increasing
length.
≥
are
not
influenced
by
remain
constant.
vegetated
regions
same
plant
density,
discontinuous
(streamwise
interval
width
D
yield
weaker
than
continuous
canopies.
The
mutual
influence
between
must
be
considered
if
satisfies
3
.
These
results
provide
insights
designing
river
projects.
Journal of Fluid Mechanics,
Journal Year:
2025,
Volume and Issue:
1006
Published: March 7, 2025
This
study
investigates
how
the
spatial
configuration
of
submerged
three-dimensional
patches
vegetation
impacts
turbulence.
Laboratory
experiments
were
conducted
in
a
channel
with
model
configured
different
patch
area
densities
(
$\phi
_{p}$
),
representing
bed
fraction
occupied
by
patches,
ranging
from
0.13
to
0.78,
and
patterns
transitioning
two
dimensional
(channel-spanning
patches)
three
(laterally
unconfined
patches).
These
configurations
produced
range
flow
regimes
within
canopy,
wake
interference
skimming
flow.
At
low
density
_{p}\lt0.5$
turbulence
canopy
increased
increasing
regardless
configuration,
while
at
high
_{p}\gt0.5$
relationship
between
depended
on
patches.
For
same
density,
smaller
lateral
gaps
generated
stronger
canopy.
The
relative
contributions
shear
production
also
varied
densities,
dominated
over
production,
was
more
dominant
due
an
enhanced
layer
top
reduced
mean
velocity
A
new
predictive
for
channel-averaged
turbulent
kinetic
energy
(TKE)
developed
as
function
velocity,
geometry,
which
showed
good
agreement
measured
TKE.
Water Resources Research,
Journal Year:
2022,
Volume and Issue:
58(8)
Published: Aug. 1, 2022
Abstract
Laboratory
experiments
examined
the
longitudinal
evolution
of
near‐bed
velocity,
turbulent
kinetic
energy
(TKE),
and
net
deposition
in
a
model
Phragmites
australis
canopy
occupying
1/3
channel
width.
The
canopies
were
constructed
from
P
.
with
real
morphology
solid
volume
fraction
between
0.003
0.018.
An
exponential
was
modified
to
predict
velocity
inside
canopy,
which
TKE
can
be
predicted.
By
combining
predicted
probability,
we
proposed
distribution
canopy.
TKE,
good
agreement
measurements.
Relative
an
upstream
reference,
within
enhanced
when
two
conditions
met:
in‐canopy,
smaller
than
critical
value
for
resuspension,
resuspension
took
place
bare
channel.
Above
vegetation
density
(defined
by
ϕ
c
),
spatially‐averaged
surpassed
that
adjacent
provides
way
estimate
always
diminished
over
some
flow
adjustment
distance,
L
d
(distance
leading
edge
fully
developed
flow).
When
length
greater
0.4
,
canopy‐averaged
relative
Finally,
same
length,
differences
plant
morphologies
did
not
have
strong
impact
on
in‐canopy
distribution.
