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Title: Perception of low-frequency acoustic signals by a harbour porpoise (Phocoena phocoena) in the presence of simulated offshore wind turbine noise
Authors: Lucke, Klaus
Lepper, Paul A.
Hoeve, Bert
Everaarts, Eligius
van Elk, Niels
Siebert, Ursula
Keywords: Harbour porpoise
Phocoena phocoena
Acoustic perception
Auditory evoked potentials
North Sea
Offshore wind turbines
Issue Date: 2007
Publisher: © IWA Publishing
Citation: LUCKE, K. ... et al, 2007. Perception of low-frequency acoustic signals by a harbour porpoise (Phocoena phocoena) in the presence of simulated offshore wind turbine noise. Aquatic Mammals, 33 (1), pp. 55-68 [DOI 10.1578/AM.33.1.2007.55]
Abstract: Using auditory evoked potential (AEP) methods, a study was conducted on a harbour porpoise (Phocoena phocoena) at the Dolfinarium Harderwijk in The Netherlands. The study measured the audible range of wind turbine sounds and their potential masking effects on the acoustic perception of the animal. AEPs were evoked with two types of acoustic stimuli: (1) click-type signals and (2) amplitude-modulated signals. The masking noise resembling the underwater sound emissions of an operational wind turbine was simulated. At first, the animal’s hearing threshold was measured at frequencies between 0.7 and 16 kHz. Subsequently, these measurements were repeated at frequencies between 0.7 and 2.8 kHz in the presence of two different levels of masking noise. The resulting data show a masking effect of the simulated wind turbine sound at 128 dB re 1 μPa at 0.7, 1.0, and 2.0 kHz. This masking effect varied between 4.8 and 7.3 dB at those frequencies. No significant masking was measured at a masking level of 115 dB re 1 μPa. The available data indicate that the potential masking effect would be limited to short ranges in the open sea, but limitations exist to this conclusion and all estimates are based on existing turbine types, not taking into account future developments of larger and potentially noisier turbine types.
Description: This aricle was published in the journal, Aquatic Mammals [© European Association for Aquatic Mammals] and is also available at: http://www.aquaticmammalsjournal.org/
URI: https://dspace.lboro.ac.uk/2134/3846
ISSN: 0167-5427
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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