A practical weighting function for harbor porpoise underwater sound level measurements
Terhune, J.M. (2013). A practical weighting function for harbor porpoise underwater sound level measurements. J. Acoust. Soc. Am. 134(3): 2405-2408. http://dx.doi.org/10.1121/1.4816556
In: The Journal of the Acoustical Society of America. American Institute of Physics: New York. ISSN 0001-4966; e-ISSN 1520-8524, more
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| Author keywords |
Acoustic noise Agroacoustics Hearing Marine vehicle noise Marine vessels Psychological acoustics Acoustical measurements Environmental impacts Acoustic noise measurement Audiometry |
| Abstract |
Harbor porpoise (Phocoena phocoena) are subject to underwater noise disturbance from anthropogenic sources, especially shipping. The underwater audiograms of harbor porpoise were used to create a frequency weighting function, dBht(Phocoena phocoena), to permit estimation of the broadband perceived amplitudes of ambient and shipping noise. An equation was fit to the 0.02–20?kHz range of unmasked detection thresholds and normalizing to 0?dB at 20?kHz; dB?=?46.4–35.6 log(kHz). The weighting function de-emphasizes the low frequency components of noise. Harbor porpoise hearing is less sensitive to low frequency shipping noise and, except at high amplitudes, estimating potential noise impacts using linear measurements will be misleading. |
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