Remote Sensing,
Journal Year:
2022,
Volume and Issue:
14(21), P. 5499 - 5499
Published: Oct. 31, 2022
Salt
marshes
are
vulnerable
to
sea-level
rise,
sediment
deficits,
and
storm
impacts.
To
remain
vertically
resilient,
salt
must
accrete
at
rates
greater
or
equal
rise.
Ice-rafted
debris
(IRD),
that
has
been
moved
deposited
from
ice
sheets,
is
one
of
many
processes
contribute
marsh
accretion
in
northern
latitudes.
On
4
January
2018,
a
winter
caused
major
mobilization
the
Plum
Island
Estuary
(PIE),
Massachusetts,
USA,
which
led
large
deposits
ice-rafted
sediment.
We
aimed
quantify
volume
mass
sediment,
evaluate
significance
IRD
supply
using
pixel-based
land-cover
classification
aerial
imagery
collected
by
an
Unmanned
Aircraft
System
(UAS)
Digital
Elevation
Model.
Field
measurements
patch
thickness,
area
determined
were
used
estimate
annual
IRD.
Results
show
localized
three
areas,
estimates
contributes
rate
0.57
±
0.14
mm/y
study
site.
New
England
typically
vary
between
2–10
mm/y,
average
PIE
2.5–2.7
mm/y.
Therefore,
this
event
contributed
on
20%
material
accreted
marshes,
although
locally
deposit
thickness
was
8–14
times
rate.
can
be
useful
tool
for
identifying
remote
sensing.
Additionally,
we
suggest
potential
bring
significant
latitudes
accretion.
As
remotely
sensed
UASs
becomes
more
readily
available,
method
efficiently
identify
Water Resources Research,
Journal Year:
2024,
Volume and Issue:
60(6)
Published: June 1, 2024
Abstract
Regular
release
of
sediment
from
reservoir
has
been
increasingly
adopted
as
a
strategy
for
sustainable
management.
Here,
we
use
process‐based
morphodynamic
model
to
simulate
the
estuarine
dynamics
impacted
by
turbidity
current
venting
implemented
Shihmen
Reservoir
during
three
typhoon
events
in
2008.
Upon
validation
with
post‐event
bathymetries,
hindcasts
reveal
that
mud
releasing
can
be
effective
mitigating
siltation,
yet
may
suboptimal
alleviating
coastal
deficit.
A
vast
majority
released
muds
were
delivered
through
estuary
and
exported
offshore
flood
advection,
wave
dispersion,
tidal
flushing.
The
flood‐driven
sands,
sourced
mainly
downstream
tributaries,
instead
major
contributor
budget.
However,
mantling
(covering
immobilizing
sand
deposits
reservoir‐released
muds)
reduced
availability
thus
delivery
coast.
For
present
case,
25%
deposited
along
way,
presence
these
covers
15%,
compared
hypothetical
scenario
clear‐water
releases.
relative
transport
deficit
is
found
increase
linearly
degree
bed
saturation,
1–
D
/
R
,
ratio
single‐event
deposit
release.
Given
broad
relevance
global
reservoirs
encountering
problems
siltation
deficit,
our
findings
highlight
management
needs
look
beyond
just
bulk
amount
sediment,
but
it
critical
consider
how
different
fractions
are
interacting
human
activities.
Journal of Geophysical Research Earth Surface,
Journal Year:
2024,
Volume and Issue:
129(10)
Published: Sept. 27, 2024
Abstract
Longshore
sediment
transport
(LST)
is
essential
for
shaping
sandy
shorelines.
Many
shorelines
are
complex
and
indented,
containing
headlands,
offshore
islands
tombolos.
Tombolos
often
form
between
the
mainland;
however,
conditions
LST
across
tombolos
unclear.
This
question
important
because
reinforced
with
anthropogenic
infrastructure,
potentially
causing
starvation
of
downdrift
beaches.
Along
many
shorelines,
return
to
a
tombolo's
natural
condition
has
been
proposed
promote
connectivity
counteract
erosion.
Nevertheless,
implications
such
restorations
remain
uncertain.
In
this
study,
we
employ
Delft3D
wave‐current
model
investigate
hydrodynamics
dynamics
tombolo,
examining
its
role
as
connector
adjacent
Contrary
expectations,
our
simulations
show
only
diminutive
longshore
currents
from
updrift
beach
tombolo
unless
wave
heights
exceed
8
m.
Instead,
predominant
crossing
originate
island,
driven
by
storm‐induced
water
level
differences
circulation
cells
on
both
sides
tombolo.
The
island
shelters
domain,
resulting
in
higher
energy
dissipation
Further,
increasing
height
or
approach
angle
not
intensifies
but
also
relocates
cells,
enhancing
total
However,
general,
deposition
side
domain
does
compensate
loss
beach.
We
conclude
that
limited
occurs
under
extreme
conditions.
Journal of Geophysical Research Earth Surface,
Journal Year:
2024,
Volume and Issue:
129(10)
Published: Oct. 1, 2024
Abstract
The
survival
of
salt
marshes,
especially
facing
future
sea‐level
rise,
requires
sediment
supply.
Sediment
can
be
supplied
to
marshes
via
two
routes:
through
marsh
creeks
and
over
edges.
However,
the
conditions
tides
waves
that
facilitate
import
these
routes
remain
unclear.
To
understand
when
how
is
imported
into
2‐month
measurements
were
conducted
monitor
tides,
waves,
suspended
concentration
(SSC)
in
Paulina
Saltmarsh,
a
meso‐macrotidal
system.
results
show
creek
tends
during
neap
with
waves.
A
tidal
cycle
small
range
result
weaker
flow
ebb
reducing
export
sediment.
Waves
enhance
supply
by
eroding
mudflats.
strong
directly
resuspend
spring
water
level
above
canopy,
enhancing
creeks.
Net
edges
opposite
wave
conditions:
weak
Spring
provide
stronger
hydrodynamics,
facilitating
edge.
Increased
SSC
phase
occur
edge,
resulting
net
export.
Therefore,
or
sediment,
depends
on
combination
conditions.
These
vary
between
estuaries
even
individual
marshes.
Understanding
crucial
for
better
management
Applied Sciences,
Journal Year:
2022,
Volume and Issue:
12(21), P. 10884 - 10884
Published: Oct. 27, 2022
The
existence
of
the
Mississippi
River
(MR)
and
Tributaries’
levees
in
coastal
Louisiana
could
block
storm
surge
cause
setup
adjacent
basins.
In
order
to
reduce
amplification
caused
by
these
barriers,
one
possible
solution
is
build
“floodways”
through
mainstem
MR
allow
during
tropical
events
cross.
primary
purpose
this
study
examine
if
floodways/openings
can
help
Using
Hurricane
Isaac
(2012)
as
an
example,
a
pre-validated
Delft3D-based
hydrodynamic
model
was
applied
effect
levee
openings
on
surge.
Model
results
flux
analysis
show
that
were
not
effective
reducing
Barataria
Basin
Breton
Sound
due
complex
interaction
between
cross
flow
from
flow.
During
Isaac,
water
be
diverted
and/or
Breton,
which
resulted
increase
surge,
essentially
defeating
objective
openings.
Overall,
impact
at
selected
locations
reduction
basins
minor
very
limited.
Estuarine Coastal and Shelf Science,
Journal Year:
2023,
Volume and Issue:
295, P. 108573 - 108573
Published: Nov. 23, 2023
Estuarine
salt
marshes
globally
face
numerous
threats,
not
least
of
which
include
changing
hydrological
conditions
from
human
alteration
and
climate
change
impact
to
river
flows,
sea
levels
coastal
processes.
While
inundation
is
evident
in
many
systems,
often,
the
detail
estuarine
processes
are
what
extent
they
contribute
flooding
habitat
distribution
remains
unknown.
Water
microtidal
Swan
River
Estuary
(Derbarl
Yerrigan),
Western
Australia,
has
experienced
significant
drying
since
1970's,
were
disaggregated
assess
contributions
tides,
mean
level,
barometric
effects,
flows
river-tide
interactions.
These
mapped
a
marsh
community.
The
effect
declining
on
tides
further
assessed
by
wavelet
harmonic
analyses.
We
found
that
effects
presently
dominate
events
relevance
Declining
winter
runoff
resulted
an
increase
tidal
amplitude
upper
estuary.
There
was
also
positive
level
pressure
trend,
associated
with
rainfall
decline.
Altogether,
there
zero
net
estuary
these
Therefore,
steady
rise
masked
changes
relative
contribution
mechanisms
have
implications
for
stability
ecosystem.
Disaggregating
process
water
offers
means
better
hydrodynamic
sustaining
communities
inform
how
might
future.
results
show
can
interact
mask
non-stationary
hydrology
supporting
habitat.
Authorea (Authorea),
Journal Year:
2024,
Volume and Issue:
unknown
Published: Feb. 28, 2024
The
survival
of
salt
marshes,
especially
facing
future
sea-level
rise,
requires
the
supply
sediment.
Sediment
can
be
supplied
to
marshes
via
two
routes:
through
marsh
creeks
and
over
edges.
However,
conditions
tides
waves
that
facilitate
sediment
import
these
routes
remain
unclear.
To
better
understand
when
how
towards
occurs,
measurements
spanning
months
were
conducted
in
Paulina
Saltmarsh.
results
show
creek
edge
do
not
simultaneously.
tends
during
neap
with
waves.
A
small
tidal
range
weaker
flow
ebb
tides,
reducing
export
Strong
waves,
particularly
this
period,
enhance
from
mudflats
creek.
Additionally,
directly
affect
re-suspension
spring
water
level
is
above
canopy.
benefits
contrasting
wave
conditions,
imported
weak
Waves
re-suspend
sediment,
impeding
deposition,
thus
leading
edge.
These
highlight
potential
transport
under
varying
shedding
light
on
their
implications
for
long-term
marshes.
Remote Sensing,
Journal Year:
2022,
Volume and Issue:
14(21), P. 5499 - 5499
Published: Oct. 31, 2022
Salt
marshes
are
vulnerable
to
sea-level
rise,
sediment
deficits,
and
storm
impacts.
To
remain
vertically
resilient,
salt
must
accrete
at
rates
greater
or
equal
rise.
Ice-rafted
debris
(IRD),
that
has
been
moved
deposited
from
ice
sheets,
is
one
of
many
processes
contribute
marsh
accretion
in
northern
latitudes.
On
4
January
2018,
a
winter
caused
major
mobilization
the
Plum
Island
Estuary
(PIE),
Massachusetts,
USA,
which
led
large
deposits
ice-rafted
sediment.
We
aimed
quantify
volume
mass
sediment,
evaluate
significance
IRD
supply
using
pixel-based
land-cover
classification
aerial
imagery
collected
by
an
Unmanned
Aircraft
System
(UAS)
Digital
Elevation
Model.
Field
measurements
patch
thickness,
area
determined
were
used
estimate
annual
IRD.
Results
show
localized
three
areas,
estimates
contributes
rate
0.57
±
0.14
mm/y
study
site.
New
England
typically
vary
between
2–10
mm/y,
average
PIE
2.5–2.7
mm/y.
Therefore,
this
event
contributed
on
20%
material
accreted
marshes,
although
locally
deposit
thickness
was
8–14
times
rate.
can
be
useful
tool
for
identifying
remote
sensing.
Additionally,
we
suggest
potential
bring
significant
latitudes
accretion.
As
remotely
sensed
UASs
becomes
more
readily
available,
method
efficiently
identify
