Limnology and Oceanography,
Journal Year:
2017,
Volume and Issue:
63(S1)
Published: Oct. 5, 2017
Abstract
Non‐seagrass
sources
account
for
∼
50%
of
the
sediment
organic
carbon
(SOC)
in
many
seagrass
beds,
a
fraction
that
may
derive
from
external
matter
(OM)
advected
into
meadow
and
trapped
by
canopy
or
produced
situ.
If
allochthonous
fluxes
are
responsible
non‐seagrass
SOC
given
bed,
this
should
decrease
with
distance
perimeter.
Identifying
spatial
origin
is
important
closing
budgets
“blue
carbon”
offset‐credit
accounting,
but
studies
have
yet
to
quantify
map
stocks
source.
We
measured
δ
13
C,
15
N,
34
S
throughout
large
(6
km
2
),
restored
Zostera
marina
(eelgrass)
applied
Bayesian
mixing
models
total
contributions
possible
autotroph
sources,
Z.
,
Spartina
alterniflora
benthic
microalgae
(BMA).
accounted
<
40%
SOC,
we
did
not
find
evidence
outwelling
fringing
S.
salt‐marsh
OM
advection
bare
subtidal
areas.
averaged
10%
at
sites
both
inside
outside
meadow.
The
BMA
51%
was
highest
furthest
subtidal‐meadow
edge,
indicative
situ
production.
210
Pb
profiles
confirmed
meadow‐enhanced
sedimentation
facilitates
burial
BMA.
Deducting
contribution
would
underestimate
fixation
within
Seagrass
meadows
can
enhance
burial,
which
likely
accounts
most
stored
beds.
Frontiers in Marine Science,
Journal Year:
2018,
Volume and Issue:
5
Published: Oct. 26, 2018
Local
effects
of
flow
interaction
with
seagrass
structure
modify
meadow
scale
hydrodynamics,
resulting
in
lower
current
velocities
and
wave
heights
within
a
meadow.
This
attenuation
promotes
the
deposition
suspended
sediment,
increasing
light
available
locally
to
benthic
organisms.
To
elucidate
relationship
between
small-scale
hydrodynamics
that
occur
at
sea
floor
seagrass,
high
resolution
velocity
profiles
were
recorded
adjacent
sediment-water
interface
Zostera
marina
South
Bay,
Virginia.
Additionally,
instrumentation
was
deployed
across
seasonally
monitor
corresponding
changes
height
Results
show
reduced
by
25
–
49%
compared
an
bare
site,
13
38%
analytical
model
over
unvegetated
seafloor
same
bathymetry.
The
greatest
occurred
during
spring
summer
when
biomass
greatest,
while
lowest
winter,
periods
minimal
biomass.
Significant
coefficients,
αw,
calculated
for
ranged
from
αw
=
0.49
0.19
but
highly
dependent
on
conditions,
greater
larger
longer
period
waves.
Within
summer,
highest
measured
bed
shear
stress
t_bed
0.034±0.022
Pa,
which
peak
conditions.
suggests
rarely
exceeds
critical
shear,
t_crit
0.04
Pa
necessary
initiate
sediment
resuspension.
is
contrast
site
showed
elevated
values
above
threshold
all
seasons.
These
findings
suggest
does
exert
significant
control
both
hydrodynamic
conditions
interface,
this
due
motion
drag
induced
expanse
Journal of Geophysical Research Oceans,
Journal Year:
2020,
Volume and Issue:
125(5)
Published: April 6, 2020
Abstract
Seagrass
meadows
can
retain
fine
particles,
improving
water
clarity
and
promoting
carbon
sequestration.
Laboratory
experiments
were
conducted
to
investigate
the
influence
of
velocity
meadow
density
on
retention
particles
within
a
meadow.
Vertical
profiles
turbulent
kinetic
energy
(
TKE
)
measured
along
model
The
net
deposition
was
using
microscope
slides
positioned
inside
outside
correlated
with
evolution
At
leading
edge,
decreased
over
distance
L
r
,
relative
bare
bed,
which
associated
region
vertical
updraft
elevated
.
Net
increased
from
decrease
in
In
some
cases,
distinct
peak
observed
at
p
minimum
Both
increasing
density.
Deposition
fully
developed
decreasing
stem
channel
velocity,
for
lowest
highest
less
than
that
channel.
Diminished
linked
resuspension
driven
by
stem‐generated
turbulence.
A
canopy‐averaged
validated
used
explore
range
field
conditions
would
be
reduced,
support
accumulation
organic
material
Ocean Dynamics,
Journal Year:
2023,
Volume and Issue:
73(11), P. 699 - 727
Published: Oct. 18, 2023
Abstract
Global
climate
change
increases
the
overall
risks
for
coastal
flooding
and
erosion.
Meanwhile,
nature-based
solutions
(NbS)
are
increasingly
becoming
a
focus
of
protection
measures
to
improve
adaptability.
In
this
study,
present
potential
future
role
seagrass
in
risk
reduction
strategies
were
explored
highly
energetic
Wadden
Sea
area
German
Bight.
The
methodology
study
combined
coverage
data
(
Zostera
marina
noltei
)
obtained
by
field
surveys
what-if
scenario
simulations
using
SCHISM
unstructured
grid
model
framework,
coupling
hydrodynamics,
waves,
sediments,
module.
results
suggest
that
introduction
meadows
locally
can
reduce
both
current
velocities
significant
wave
heights
order
up
30
$$\%$$
%
deeper
areas
above
90
shallow
areas.
Reduction
bottom
shear
stress
similar
relative
magnitude
significantly
reduced
sediment
mobilisation
on
2
g/L
95th
quantile
layer
concentrations.
Effectively
altering
hydromorphodynamic
conditions
favouring
accumulation,
expansion
could
help
tidal
flats
height
growths
keep
with
SLR,
thus
further
maintaining
bathymetry-induced
dampening
lowering
erosion
as
well
amount
energy
at
dike
infrastructure.
accumulated
effect
under
calm
weather
is
considered
more
important
than
increased
attenuation
absolute
values
it
provides
during
extreme
conditions.
conclusion
be
useful
addition
engineered
measures.
Limnology & Oceanography Fluids & Environments,
Journal Year:
2013,
Volume and Issue:
3(1), P. 225 - 239
Published: Feb. 1, 2013
Lay
Abstract
The
Eastern
oyster,
Crassostrea
virginica
,
often
forms
intertidal
reefs
composed
of
dense
assemblages
oysters.
Because
their
suspension
feeding,
oysters
clear
large
quantities
particulate
matter
from
the
water
column,
removing
not
only
phytoplankton
but
also
suspended
sediment.
In
addition,
because
metabolic
requirements,
can
utilize
substantial
oxygen.
An
oyster
reef
was
monitored
to
quantify
processes
affecting
flow,
sediment
deposition
and
erosion,
exchange
oxygen
reef.
At
center
reef,
flux
measured
using
an
eddy‐correlation
technique,
while
uptake
computed
difference
between
upstream
downstream
concentrations
across
While
submerged,
increased
linearly
with
velocity,
ranging
100
600
mmol
m
−
2
d
1
.
Sediment
for
velocities
0
10
cm
s
However,
>15
by
decreased,
at
flows
>25
there
net
erosion
due
resuspension
Overall,
results
show
that
have
a
positive
effect
on
clarity
exert
strong
influence
surface.
Sedimentology,
Journal Year:
2014,
Volume and Issue:
62(4), P. 997 - 1023
Published: Oct. 7, 2014
Abstract
Innovative
flume
experiments
were
conducted
in
a
recirculating
straight
flume.
Zostera
noltei
meadows
sampled
their
natural
bed
sediments
the
field
at
contrasting
stages
of
seasonal
growth.
The
aims
this
study
were:
(i)
to
quantify
combined
effects
leaf
flexibility
and
development
characteristics
canopies
on
interaction
with
hydrodynamics;
(ii)
role
suspended
sediment
trapping
resuspension
related
changes
hydrodynamic
forcing
caused
by
seagrasses.
Velocity
within
canopy
was
significantly
damped.
attenuation
velocity
ranged
from
34
87%
compared
bare
associated
density
threshold
resulting
flow‐induced
reconfiguration.
reduction
flow
higher
dense
velocities
than
less
canopies,
which
greater
low
velocities.
These
contrasted
results
can
be
explained
competition
between
rough‐wall
boundary
layer
shear
canopy.
two
three‐fold
increase
bottom
stress
unvegetated
sediment.
Despite
near‐bed
turbulence,
protection
against
erosion
increased
under
fully
developed
meadow,
while
properties
found
main
factor
controlling
meadow.
Deposition
fluxes
vegetated
sediments,
these
density.
Fewer
freshly
deposited
resuspended
beds,
an
net
deposition
meadow
However,
case
very
high
area
index,
mostly
leaves,
facilitated
subsequent
resulted
efficient
