Averaging underwater noise levels for environmental assessment of shipping

Nathan D. Merchant, Philippe Blondel, D. Tom Dakin, John Dorocicz

Research output: Contribution to journalArticle

36 Citations (Scopus)
161 Downloads (Pure)

Abstract

Rising underwater noise levels from shipping have raised concerns regarding chronic impacts to marine fauna. However, there is a lack of consensus over how to average local shipping noise levels for environmental impact assessment. This paper addresses this issue using 110 days of continuous data recorded in the Strait of Georgia, Canada. Probability densities of ∼ 10 7 1-s samples in selected 1/3 octave bands were approximately stationary across one-month subsamples. Median and mode levels varied with averaging time. Mean sound pressure levels averaged in linear space, though susceptible to strong bias from outliers, are most relevant to cumulative impact assessment metrics. Probability densities of ~ 10^7 1-s samples in selected 1/3 octave bands were approximately stationary across one-month subsamples. Median
and mode levels varied with averaging time. Mean sound pressure levels averaged in linear space, though susceptible to strong bias from outliers, are most relevant to cumulative impact assessment metrics.
Original languageEnglish
Pages (from-to)EL343-EL349
Number of pages8
JournalJournal of the Acoustical Society of America
Volume132
Issue number4
Early online date19 Sep 2012
DOIs
Publication statusPublished - 1 Oct 2012

Keywords

  • underwater acoustics
  • ambient noise
  • shipping
  • Environmental impact

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