A practical weighting function for harbor porpoise underwater sound level measurements

Terhune, John M.

doi:10.1121/1.4816556

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…More re cently, alternative weighting curves have been based on the shape of the audiogram (e.g. Terhune 2013, Wensveen et al 2014) and this type of weighting is currently being implemented in US regulation (NMFS 2016). For porpoises there is experimental evidence supporting this type of weighting over Mweighting , both when it comes to predicting levels capable of inflicting TTS and levels causing behavioural deterrence.…”

Section: Introductionmentioning

confidence: 99%

Bubble curtains attenuate noise from offshore wind farm construction and reduce temporary habitat loss for harbour porpoises

Dähne¹,

Tougaard²,

Carstensen³

et al. 2017

Mar. Ecol. Prog. Ser.

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Effects of constructing the DanTysk offshore wind farm (German Bight, 80 turbines, 6 m diameter foundations) were studied by passive acoustic monitoring of pile-driving noise and harbour porpoise Phocoena phocoena echolocation. An acoustic deterrence device (seal scarer) was used to protect porpoises from hearing loss and bubble curtains were used to attenuate the pile-driving noise. Porpoise occurrence, quantified by echolocation signals, decreased when the seal scarer was engaged, during pile driving and up to 5 h after pile driving stopped. This effect extended out to 12 km, less than the 18−25 km reported from other pile drivings performed without bubble curtains. The bubble curtains thus effectively reduced the temporary habitat loss and risk of hearing loss. The 2 bubble curtains each attenuated the noise by between 7 and 10 dB, when used separately, and 12 dB when used together. Attenuation was most pronounced above 1 kHz, where the pile-driving noise at larger distances was comparable to or lower than ambient noise. This suggests that noise regulation should be based on frequency-weighted sound levels in addition to broadband levels, to assure that mitigation measures are effective in reducing impact on animals and not only in fulfilling legal requirements. The strong reaction to the seal scarer raises concern that it may surpass the reactions to the pile-driving noise itself, when operating with bubble curtains, and calls for a re-evaluation of the specifications of seal scarer sounds.

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Section: Introductionmentioning

confidence: 99%

Bubble curtains attenuate noise from offshore wind farm construction and reduce temporary habitat loss for harbour porpoises

Dähne¹,

Tougaard²,

Carstensen³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…From 2013 to 2017, dolphin's hearing sensitivity, hearing threshold, exposure sound pressure level limit standard and weight were systematically studied. [15][16][17][18] It was found that the pile driving noise can affect the vocal behavior of dolphins, hinder the migration of dolphins, and cause damage to their reproduction and hearing. [19][20][21] In order to evaluate the impact of underwater noise induced by construction on marine ecosystem, the pile driving noise 14 during the construction of offshore wind farms was measured, and its spatial distribution under water was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Sound contribution of the low frequency underwater noise radiated from a suspension bridge

Song

Lü

Xiong

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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For river crossing bridges, the vehicle-induced vibration can be transmitted to the bridge tower and foundation system. This vibration induced low frequency underwater noise radiation can cause great harm to aquatic organisms. A river crossing suspension bridge was selected to study the sound contribution and spatial distribution of the underwater noise. A bridge-sediment coupling finite element model was developed, and the vehicle-bridge-sediment interaction analysis was conducted to investigate the dynamic response of the coupling system. An acoustic finite element model was built to predict the underwater noise radiated from the tower and sediment, and the noise contribution of these two sound sources was compared. The research shows that the noise radiated from the bridge tower and the sediment is below 6.3 Hz, and the peak frequency is around 3.15 Hz. The noise radiated from bridge tower only has a larger contribution to the total noise level in its vicinity than the sediment, especially around the water surface. In other space, the noise generated through the sediment vibration plays a dominant role in the total noise. The radiated noise from the tower has lateral directivity, and the directivity of the sediment radiation is similar to the point sound source.

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Cetacean noise criteria revisited in the light of proposed exposure limits for harbour porpoises

Tougaard

Wright

Madsen

2015

Marine Pollution Bulletin

110

109

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The impact of underwater noise on marine life calls for identification of exposure criteria to inform mitigation. Here we review recent experimental evidence with focus on the high-frequency cetaceans and discuss scientifically-based initial exposure criteria. A range of new TTS experiments suggest that harbour and finless porpoises are more sensitive to sound than expected from extrapolations based on results from bottlenose dolphins. Furthermore, the results from TTS experiments and field studies of behavioural reactions to noise, suggest that response thresholds and TTS critically depend on stimulus frequency. Sound exposure levels for pure tones that induce TTS are reasonably consistent at about 100 dB above the hearing threshold for pure tones and sound pressure thresholds for avoidance reactions are in the range of 40-50 dB above the hearing threshold. We propose that frequency weighting with a filter function approximating the inversed audiogram might be appropriate when assessing impact.

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A practical weighting function for harbor porpoise underwater sound level measurements

Cited by 6 publications

References 6 publications

Bubble curtains attenuate noise from offshore wind farm construction and reduce temporary habitat loss for harbour porpoises

Bubble curtains attenuate noise from offshore wind farm construction and reduce temporary habitat loss for harbour porpoises

Sound contribution of the low frequency underwater noise radiated from a suspension bridge

Cetacean noise criteria revisited in the light of proposed exposure limits for harbour porpoises

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