Introduction to the special issue on verification and validation of source and propagation models for underwater sound
The Journal of the Acoustical Society of America,
Год журнала:
2025,
Номер
157(2), С. 976 - 979
Опубликована: Фев. 1, 2025
This
joint
Special
Issue
of
JASA
and
Express
Letters
focuses
on
underwater
sound
source
propagation
modelling,
both
ambient
as
well
sources
relevance
to
possible
effects
aquatic
life,
corresponding
acoustical
metrics.
Combining
information
the
field
with
a
dose-effect
relationship
enables
estimation
potential
effects.
The
presents
collection
eighteen
articles
following
topics:
(1)
verification
models,
(2)
validation
(3)
bioacoustical
metrics
for
assessment
risk
environmental
special
issue
demonstrates
need
clear
protocols.
Язык: Английский
Thresholding Dolphin Whistles Based on Signal Correlation and Impulsive Noise Features Under Stationary Wavelet Transform
Journal of Marine Science and Engineering,
Год журнала:
2025,
Номер
13(2), С. 312 - 312
Опубликована: Фев. 7, 2025
The
time–frequency
characteristics
of
dolphin
whistle
signals
under
diverse
ecological
conditions
and
during
environmental
changes
are
key
research
topics
that
focus
on
the
adaptive
response
mechanisms
dolphins
to
marine
environment.
To
enhance
quality
utilization
passive
acoustic
monitoring
(PAM)
recorded
whistles,
challenges
faced
by
current
wavelet
thresholding
methods
in
achieving
precise
threshold
denoising
low
signal-to-noise
ratio
(SNR)
confronted.
This
paper
presents
a
method
based
stationary
transform
(SWT),
utilizing
suppression
impulsive
autocorrelation
function
(SI-ACF)
select
thresholds.
introduces
metric
ρ,
correlation
signals,
which
facilitates
estimation
SNR
without
requiring
prior
information.
Additionally,
it
exploits
high
amplitude
broadband
noise,
utilizes
multi-resolution
information
domain
remove
noise
through
multi-level
sliding
window
approach.
SI-ACF
was
validated
using
both
simulated
real
datasets.
Simulated
were
employed
evaluate
method’s
performance
three
types
typical
underwater
noise.
Real
whistles
used
confirm
its
applicability
scenarios.
test
results
show
effectively
eliminates
improves
signal
spectrogram
visualization,
enhances
accuracy
automated
detection,
highlighting
potential
for
preprocessing
SNR.
Язык: Английский
Examining the effect of intensive seismic surveys on abundance and behaviour of groundfish species along a continental slope of Newfoundland and Labrador, Canada
Marine Pollution Bulletin,
Год журнала:
2025,
Номер
215, С. 117889 - 117889
Опубликована: Апрель 2, 2025
This
study
investigated
changes
in
the
abundance
and
behaviour
of
groundfish
species
at
a
relatively
deep-water
site
along
eastern
continental
slope
Canada,
when
exposed
to
commercial
seismic
survey
that
lasted
100
consecutive
days.
Baited
cameras
were
deployed
control
impact
sites,
before
after
exposure,
consisting
323,
5-h
long,
videos.
Changes
not
explained
by
surveying
noise
for
any
five
commonly
observed
fish
species.
However,
Atlantic
cod
found
have
significantly
longer
arrival-times
baited
camera
stations
it
took
available
bait
be
consumed
immediately
occurred.
effect
occurred
daily
mean
sound
pressure
level
>120
dB
re
1
μPa2
prior
experimental
measurements.
The
contributes
towards
better
ecological
understating
noise-related
impacts
over
wide
range
conditions
where
occur.
Язык: Английский
Trade-offs and synergies in the management of environmental pressures: a case study on ship noise mitigation
Marine Pollution Bulletin,
Год журнала:
2025,
Номер
218, С. 118073 - 118073
Опубликована: Май 16, 2025
Underwater
noise
from
shipping
is
increasingly
recognized
as
a
significant
pollutant
that
can
have
range
of
detrimental
effects
on
marine
organisms.
However,
ships
impact
life
in
more
than
one
way.
From
management
perspective,
holistic
approach
could
provide
successful
way
to
minimize
the
ship
traffic
sequential,
single-pressure
mitigation.
In
this
paper,
we
assess
how
other
pressures
are
affected
by
six
mitigation
measures:
speed
restriction,
rerouting,
convoying,
frequent
hull/propeller
cleaning,
ship-quieting
technologies,
and
incentivising
fewer,
larger
ships.
Here,
present
apply
framework
evaluate
synergies
trade-offs
implementation
measures
better
consider
cumulative
advance
effective,
management.
Using
expert
judgement
peer-reviewed
literature,
each
proposed
determine
whether
they
likely
synergistic
or
trade-off
impacts
pressures,
scale
effect,
strength
evidence.
Overall,
reduction
has
mostly
with
only
weak
pressures.
Frequent
hull
propeller
cleaning
fewer
synergies,
but
also
very
few
trade-offs,
whereas
convoying
expected
be
measure
most
Re-routing
incentivization
unclear
outcomes,
because
will
depend
circumstances
implementation.
We
conclude
carefully
considered
thoughtfully
implemented
lead
multiple
benefits
across
Язык: Английский
Effects of sediment properties, distance from source, and frequency weighting on sound pressure and sound pressure kurtosis for marine airgun signatures
The Journal of the Acoustical Society of America,
Год журнала:
2024,
Номер
156(6), С. 4242 - 4255
Опубликована: Дек. 1, 2024
Investigation
of
sound
pressure
waveforms
helps
the
selection
appropriate
metrics
to
evaluate
their
effects
on
marine
life
in
relation
noise
thresholds.
As
animals
move
farther
away
from
a
source,
temporal
characteristics
may
be
influenced
by
interactions
with
sediment
and
sea
surface.
Sound
kurtosis
root-mean-square
(rms)
are
quantitative
that
depend
shape
pulse,
related
qualitative
characteristic
“impulsiveness.”
After
verifying
propagation
modeling
approach
using
selected
test
cases
JAM
Workshop
held
Cambridge,
UK,
2022,
time
dispersion
values
signals
produced
an
individual
airgun
shot
across
various
types
analyzed.
The
results
reveal
there
is
significant
pulse
when
seabed
consists
predominantly
sand-type
sediments:
i.e.,
signal
duration
increases
considerably
over
long
distances,
thus
decreasing
sequence
pulses,
whereas
more
limited
for
clay
silt-type
sediments.
range
variations
frequency
weighted
rms
differ
those
unweighted
kurtosis,
depending
corresponding
lower
upper
roll-off
frequencies
different
animal
groups.
Язык: Английский