Physics-informed and machine learning-enabled retrieval of ocean current speed from flow noise

The Journal of the Acoustical Society of America, Год журнала: 2025, Номер 157(2), С. 1084 - 1096

Опубликована: Фев. 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.

Язык: Английский

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Observation of exceptionally strong near-bottom flows over the Atlantis II Seamounts in the northwest Atlantic

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Май 5, 2024

Abstract Knowledge of near-bottom ocean current velocities and especially their extreme values is necessary to understand geomorphology the seafloor composition benthic biological communities quantify mechanical energy dissipation by bottom drag. Direct measurements currents in deep remain scarce because logistical challenges. Here, we report results flow velocity pressure fluctuation at three sites with depths 2573–4443 m area where Gulf Stream interacts New England Seamounts. Repeated episodes unexpectedly strong were observed, speed 4443 more than 0.40 m/s. At 2573 m, speeds exceeded 0.20 m/s approximately 5% time throughout entire eight-week measurement period. The maximum over 1.10 recorded this site significantly surpass fastest previously reported directly measured comparable or larger depths. A correlation found between noise intensity infrasonic band speed. characteristic frequency increase increasing Machine-learning tools are employed infer from flow-noise not equipped a meter.

Язык: Английский

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Soundscape and fish passive acoustic monitoring around a North Sea gas-production platform in the Dogger Bank

PLoS ONE, Год журнала: 2025, Номер 20(4), С. e0319536 - e0319536

Опубликована: Апрель 2, 2025

This study provides temporo-spatial characterisation of the underwater soundscape in proximity a relatively newly installed offshore gas-production platform North Sea’s Dogger Bank Special Area Conservation, recorded by Static Acoustic Monitoring at different distances from wellhead (70 m, 5 Km and 10 km). Long-Term Spectrogram Analysis percentile Power Spectral Densities demonstrated strong acoustic similarity between sites; no biophonic acoustic-mass phenomena were present. All locations characterized Underwater Radiated Noise, concentrated < 2 kHz, which dominated soundscape. Fish community analysis was performed to explore occurrence, richness, abundance, diel, seasonal patterns putative fish sounds. Principal Component used infer potential sound-emitting species, on Sea sounds downloaded Global Inventory known ( https://fishsounds.net/ ), analyzed for same features characterize during this study. The low levels diversity (acoustic richness ranging 1 2) abundance (never above min -1 ). sound type ‘Pulse Series’ (PS), emitted 70 m km station September ca. 19:00 23:00, with closest linear combination those typifying Eutrigla gurnardus . ‘Low-frequency Down-Sweep’ (LF-DS) all stations grunts Gadus morhua represents first application context environmental management an operational gas production platform.

Язык: Английский

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Characterising underwater noise and changes in harbour porpoise behaviour during the decommissioning of an oil and gas platform

Marine Pollution Bulletin, Год журнала: 2024, Номер 200, С. 116083 - 116083

Опубликована: Фев. 9, 2024

Many man-made marine structures (MMS) will have to be decommissioned in the coming decades. While studies on impacts of construction MMS mammals exist, no research has been done effects their decommissioning. The complete removal an oil and gas platform Scotland 2021 provided opportunity investigate response harbour porpoises Arrays broadband noise recorders echolocation detectors were used describe characteristics produced by decommissioning activities assess porpoise behaviour. During decommissioning, sound pressure spectral density levels frequency range 100 Hz 48 kHz 30-40 dB higher than baseline, with vessel presence being main source noise. study detected small-scale (< 2 km) short-term displacement during occurrence increasing immediately after this. These findings can inform consenting process for future projects.

Язык: Английский

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Joint Monitoring Program for Ambient Noise in the North Sea

Springer eBooks, Год журнала: 2024, Номер unknown, С. 1967 - 1977

Опубликована: Янв. 1, 2024

Язык: Английский

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Low‐frequency noise affects development and movement patterns of a calanoid copepod

Limnology and Oceanography, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Abstract Anthropogenic stressors are omnipresent in marine environments and interfere with organisms of all sizes, from large whales to small organisms. We investigated potential interactive multistressor effects increased temperature chronic low‐frequency sound on the development movement patterns calanoid copepod Acartia tonsa , a model species for zooplankton. Copepods were reared while exposed around 15 22 dB re 1 μ Pa 2 Hz −1 above control pressure levels at frequencies between 110 120 Hz, 21°C (increased temperature) 18°C (control temperature). For each scenario, we assessed after‐incubation rate, stage distribution, patterns. found that fewer copepods reached developmental stages copepodites IV VI conditions, even though warmer conditions rate. By using high‐speed videography both observed showed more escape behaviors (drops) feeding‐associated (helical swimming) when (~ 42 higher than normal 142 Hz). added did not reverse these trends despite absence their feeding environment. These significant behavioral changes suggest detrimental negative, life‐long, consequences sound.

Язык: Английский

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Joint Monitoring Program for Ambient Noise in the North Sea

Springer eBooks, Год журнала: 2023, Номер unknown, С. 1 - 11

Опубликована: Янв. 1, 2023

Язык: Английский

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