Hi Colleagues
I would like to draw your attention to an article my colleague Uwe
Stöber
and I have just published in JASA.
Effect of impact pile driving noise on marine mammals: A comparison of different noise exposure criteria
In this work we compare the results of noise impact assessments when using different noise exposure criteria. We hope we can contribute to the regulatory discussion
on noise issues with this piece.
Link is below. For reprints, please contact me directly.
https://doi.org/10.1121/1.5109387
Abstract:
Regulators in Europe and in the United States have developed sound exposure criteria. Criteria
range from broadband levels to frequency weighted received sound levels. The associated differences
in impact assessment results are, however, not yet understood. This uncertainty makes
environmental management of transboundary anthropogenic noise challenging and causes confusion
for regulators who need to choose appropriate exposure criteria. In the present study, three
established exposure criteria frameworks from Germany, Denmark, and the US were used to analyse
the effect of impact pile driving at a location in the Baltic Sea on harbor porpoise and harbor
seal hearing. The acoustic modeling using MIKE showed that an unmitigated scenario would lead
to auditory injury for all three criteria. Despite readily apparent variances in impact ranges among
the applied approaches, it was also evident that noise mitigation measures could reduce underwater
sound to levels where auditory injuries would be unlikely in most cases. It was concluded that each
of the frameworks has its own advantages and disadvantages. Single noise exposure criteria follow
the precautionary principle and can be enforced relatively easily, whereas criteria that consider
hearing capabilities and animal response movement can improve the accuracy of the assessment if
data are available. VC 2019 Acoustical Society of America. https://doi.org/10.1121/1.5109387
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Frank Thomsen |
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