Marine Pollution Bulletin,
Journal Year:
2024,
Volume and Issue:
203, P. 116417 - 116417
Published: May 2, 2024
Estuaries
have
been
shown
to
be
potential
hotspots
of
microplastic
accumulation,
but
the
hydrodynamic
conditions
and
particle
properties
that
control
this
process
need
further
investigation.
We
designed
a
series
numerical
particle-tracking
experiments
examine
sensitivity
retention
in
estuaries
size,
density
varying
tides
freshwater
flow.
At
end
simulation,
over
90
%
sinking
particles
are
retained
estuary,
rate
is
increased
by
high
river
runoff.
In
contrast,
discharge
increases
number
marginally-buoyant
(i.e.
close
estuarine
water)
escape
estuary.
Larger
size
tends
limit
downstream
transport
can
facilitate
particles.
Tidal
asymmetry,
vertical
turbulent
mixing
structure
subtidal
circulation
proposed
as
underlying
mechanisms
controlling
fate
Frontiers in Water,
Journal Year:
2022,
Volume and Issue:
3
Published: Jan. 26, 2022
Land-based
plastic
waste,
carried
to
the
sea
through
rivers,
is
considered
a
main
source
of
marine
pollution.
However,
most
plastics
that
leak
into
environment
never
make
it
ocean.
Only
small
fraction
are
found
in
terrestrial
and
aquatic
compartments
river
systems
emitted,
vast
majority
can
be
retained
for
years,
decades,
potentially
centuries.
In
this
perspective
paper
we
introduce
concept
as
reservoirs.
Under
normal
conditions,
hydrometeorological
variables
(such
wind,
runoff
discharge)
mobilize,
transport
deposit
within
different
(e.g.,
riverbanks,
floodplains,
lakes,
estuaries).
The
emptying
these
reservoirs
primarily
occurs
under
extreme
hydrological
conditions
storms,
floods).
specifically
focus
on
retention
mechanisms
compartments,
their
effect
fate
accumulated
various
timescales.
We
aim
rivers
(long-term)
sinks
pollution,
provide
suggestions
future
research
directions.
Water Biology and Security,
Journal Year:
2023,
Volume and Issue:
2(4), P. 100192 - 100192
Published: June 20, 2023
This
paper
outlines
the
nature
of
microplastic
contamination
in
rivers
and
risks
to
freshwater
fishes.
We
discuss
how
input
sources
influence
concentration
composition
microplastics
examine
factors
that
subsequently
their
spatiotemporal
dynamics
a
river
system.
then
distributions
assemblages
microplastics,
fishes
can
impact
risk
interactions,
processes
associated
with
internalisation
into
body
across
organs
tissues.
Finally,
we
physical
toxicological
effects
exposure
fish
species,
special
attention
directed
towards
impacts
at
environmentally
relevant
concentrations.
review
integrates
expertise
fluvial
geomorphological
they
movement
storage
channel
environments
range
scales.
combine
this
knowledge
ecology
biology
set
out
new
integrated
analysis
these
interact
fish.
The
integration
from
fields
allows
us
also
comment
upon
other
biota
environments.
The Science of The Total Environment,
Journal Year:
2022,
Volume and Issue:
838, P. 156354 - 156354
Published: May 29, 2022
Macroplastic
storage
in
mountain
rivers
remains
unexplored
and
it
is
unknown
how
river
morphology
different
surface
types
of
areas
modulate
this
process.
Therefore,
we
sampled
macroplastic
debris
stored
on
the
emergent
with
vegetation
cover
wood
jams
a
channelized,
single-thread
reach
an
unmanaged,
multi-thread
Dunajec
River
Polish
Carpathians.
Total
amounts
retained
these
reaches
were
then
estimated
basis
mean
mass
deposited
unit
area
each
type
given
reach.
Exposed
sediments
covered
herbaceous
significantly
lower
(0.6
0.9
g
per
1
m2
average)
than
wooded
islands
(respectively
6
113
m2).
The
exceeded
19,
129
180
times
those
found
islands,
exposed
sediments.
Wooded
covering
16.7%
1.5%
43.8%
41.1%,
respectively,
total
amount
that
reach,
whereas
practically
absent
channelized
Consequently,
2.4
wider
neighbouring
36
greater
km
length.
Our
study
demonstrated
controlled
by
channel
management
style
resultant
morphology,
which
hydrodynamics
longitudinal
pattern
zones
transport
retention
conveyed
flow.
The Science of The Total Environment,
Journal Year:
2022,
Volume and Issue:
865, P. 161224 - 161224
Published: Dec. 28, 2022
Mountain
rivers
are
typically
seen
as
relatively
pristine
ecosystems,
supporting
numerous
goods
(e.g.,
water
resources)
for
human
populations
living
not
only
in
the
mountain
regions
but
also
downstream
from
them.
However
recent
evidence
suggests
that
river
valleys
populated
areas
can
be
substantially
polluted
by
macroplastic
(plastic
item
>25
mm).
It
is
unknown
how
distinct
characteristics
of
modulate
routes
through
them,
which
makes
planning
effective
mitigation
strategies
difficult.
To
stimulate
future
works
on
this
gap,
we
present
a
conceptual
model
transport
pathways
river.
Based
model,
formulate
four
hypotheses
input,
and
mechanical
degradation
rivers.
Then,
propose
designs
field
experiments
allow
each
hypothesis
to
tested.
We
hypothesize
some
natural
catchments
accelerate
input
improperly
disposed
waste
slope
Further,
specific
hydromorphological
high
flow
velocity)
rate
together
with
presence
shallow
coarse
bed
sediments
it
channels,
accelerating
secondary
microplastic
production.
The
above
act
factories,
able
produce
more
same
amount
inputted
into
them
(in
comparison
lowland
have
different
hydromorphology).
produced
risks
affect
transported
downstream.
challenge
manage
hypothesized
risks,
especially
particularly
exposed
plastic
pollution
due
management
deficiencies,
tourism
pressure,
poor
ecological
awareness
population
lack
uniform
regional
global
regulations
problem.
Aquatic Ecology,
Journal Year:
2023,
Volume and Issue:
57(2), P. 557 - 570
Published: May 12, 2023
Abstract
Microplastics
(MPs)
in
rivers
present
an
ecological
risk.
In
this
paper,
we
review
hydro-geomorphological,
biological,
and
allochthonous
factors
that
may
influence
the
distribution
transport
of
MPs
riverine
systems.
We
also
characteristics
impact
their
transport.
At
reach
scale,
hydraulic
biotopes
key
features
such
as
flow
velocity,
bed
roughness,
depth,
channel
morphology
are
important
shape
systems
should
be
considered
design
studies.
Microbial-MPs
interaction
density,
aggregation
thus
dynamics.
Instream
vegetation
act
a
physical
trap
MPs,
which
horizontal
aggregation.
Lateral
is
impacted
mostly
by
precipitation,
run-off,
point
non-point
discharges.
The
polymer
size
shapes
critical
dynamics
Microplastic
sampling
protocols
designed
to
reflect
hydro-geomorphological
considerations.
unique
creates
differential
exposure
organisms
used
unravel
potential
impacts.
Biomonitoring
studies
integrate
complex
MPs-hydraulic
for
ecologically
meaningful
investigation
into
organismal
preferred
biotopes.
Overall,
our
indicates
influences
on
significance
study
rivers.
