Spatial observations of low-frequency acoustic propagation near isolated seamounts using an autonomous surface vehicle DOI Creative Commons
Matthew McKinley,

Davis Rider,

Laurent Grare

et al.

JASA Express Letters, Journal Year: 2025, Volume and Issue: 5(4)

Published: April 1, 2025

This work demonstrates the feasibility of using autonomous surface vehicles equipped with a shallow towed acoustic module (TAM) to survey spatial variability low-frequency propagation across complex bathymetry, such as Atlantis II seamounts in Northwest Atlantic. The abrupt seamount topography is found significantly influence TAM's recordings chirp transmissions (500–600 Hz band) from bottom-moored source ∼30 km by notably causing blockage in-plane paths and reverberation arrivals displaying three-dimensional effects, confirmed synthetic aperture beamforming. Ray tracing simulations are compared these observations based on data-assimilated ocean model.

Language: Английский

Physics-informed and machine learning-enabled retrieval of ocean current speed from flow noise DOI
Tsu Wei Tan, Oleg A. Godin,

Matthew W. Walters

et al.

The Journal of the Acoustical Society of America, Journal Year: 2025, Volume and Issue: 157(2), P. 1084 - 1096

Published: Feb. 1, 2025

Episodes of exceptionally strong near-bottom currents were encountered at depths over 2500 m in a 52-day deployment moored autonomous acoustic noise recorders (MANRs) the Atlantis II Seamounts Northwest Atlantic. A correlation is found between current speed and intensity, especially infrasonic frequencies below 20 Hz. Flow ambient sound, including shipping noise, made comparable contributions to measured intensity but had distinct spectral properties. This paper explores way identify quantify differences flow sound pressure fluctuations by hydrophone find statistical characteristics which contain robust information about speed. regression tree machine learning model was developed relate features directly speeds. By training using data from MANR equipped with meter, time series obtained 1-min resolution another MANR, where only available. Accuracy inferred speeds confirmed comparing dependence spectra on two MANRs.

Language: Английский

Citations

0
Spatial observations of low-frequency acoustic propagation near isolated seamounts using an autonomous surface vehicle DOI Creative Commons
Matthew McKinley,

Davis Rider,

Laurent Grare

et al.

JASA Express Letters, Journal Year: 2025, Volume and Issue: 5(4)

Published: April 1, 2025

This work demonstrates the feasibility of using autonomous surface vehicles equipped with a shallow towed acoustic module (TAM) to survey spatial variability low-frequency propagation across complex bathymetry, such as Atlantis II seamounts in Northwest Atlantic. The abrupt seamount topography is found significantly influence TAM's recordings chirp transmissions (500–600 Hz band) from bottom-moored source ∼30 km by notably causing blockage in-plane paths and reverberation arrivals displaying three-dimensional effects, confirmed synthetic aperture beamforming. Ray tracing simulations are compared these observations based on data-assimilated ocean model.

Language: Английский

Citations

0