Source and propagation modelling scenarios for environmental impact assessment: Model verification

The Journal of the Acoustical Society of America, Journal Year: 2024, Volume and Issue: 156(3), P. 1489 - 1508

Published: Sept. 1, 2024

Evaluation of possible effects underwater sound on aquatic life requires quantification the field. A marine source and propagation modelling workshop took place in June 2022, whose objectives were to facilitate evaluation models identify relevant metrics for environmental impact assessment. The scope included model verification (model-model comparison) validation (model-measurement multiple sources, including airguns, a low-frequency multi-beam echo sounder, surface vessel. Several scenarios specified workshop; these are described herein.

Language: Английский

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Exploring offshore particle motion soundscapes

The Journal of the Acoustical Society of America, Journal Year: 2025, Volume and Issue: 157(1), P. 149 - 168

Published: Jan. 1, 2025

Fishes and aquatic invertebrates utilize acoustic particle motion for hearing, some additionally detect sound pressure. Yet, few underwater soundscapes studies report motion, which is often assumed to scale predictably with pressure in offshore habitats. This relationship does not always exist low frequencies or near reflective boundaries. study compared from hydrophone arrays the seafloor at six sites on U.S. Mid South Atlantic Outer Continental Shelf assessed predictability of levels by environmental indicators (wind, vessels, temperature, currents). Unidentified fish sounds (100–750 Hz) had magnitudes 4.8–12.6 dB greater than those predicted single (pressure) measurements, indicating that these were received field. Excess attributed hydrodynamic flow noise (<100 was also present all sites. Most (25th–75th percentile) other sources far field (vessels, mammals), measured within ±3 measurements. The results emphasize importance measurement short-time (1 min) signals, sufficient long-term year) predictive modeling.

Language: Английский

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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, Journal Year: 2025, Volume and Issue: 157(2), P. 976 - 979

Published: Feb. 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.

Language: Английский

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Estimation of peak dosage of kinetic acoustic measures from pressure measurements as derived from time-limited signal waveforms

JASA Express Letters, Journal Year: 2024, Volume and Issue: 4(12)

Published: Dec. 1, 2024

This study builds on Dahl, Bonnel, and Dall'Osto [J. Acoust. Soc. Am. 155(5), 3291–3301 (2024)] by empirically demonstrating the equivalence between peak kinematic values (acoustic displacement, velocity, acceleration) dynamic (pressure). Methods for estimating levels from pressure are developed tested signals impulsive sources used in Seabed Characterization Experiment (2022) a towed narrow band sonar source Target Reverberation (2013). The comparison falls within calibration uncertainty of vector sensor. analysis shows that, typical monitoring scenarios, measurements sufficient to monitor dosages.

Language: Английский

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