mcbem-2014-01-submission-wwf-en

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Amplitude Table A1. The speed of sound (m/s) in various media, from JASCO Applied Sciences (2009). Medium Speed of sound in m/s Air at 20 o C 343 Salt water at 25 o C 1532 Sand 800-2,200 Clay 1,000-2,500 Sandstone 1,400-4,300 Granite 5,500-5,900 Limestone 5,900-6,100 How do we describe sound? Laypeople typically describe a sound by its loudness, and sometimes its pitch. The criteria that determine these characteristics are basically the sound wave’s amplitude (loudness), frequency (pitch), and duration. Waveforms are used to show time vs. amplitude (Figures A1-2), and spectrograms show time vs frequency, much like a musical score (Figure A3). Continuous sounds such as boat noise are described as chronic or non-pulsed whereas sounds that are of short duration, such as an explosion, or of repeated short durations, such as pile driving or airgun firing, are pulsed (or acute, intermittent or transient) sources of noise. In the Atlantic Ocean, airgun firing is such a predominant sound that it is often described as chronic because it is ever-present, but the original signal is a pulsed sound. Sounds such as killer whale whistles or military sonars are generally described as narrowband, whereas sounds that encompass a range of frequencies, such as shipping noise or pile driving, are broadband (Figure A3). 1 0.5 a) Low frequency: 3 cycles/s (Hz) b) higher frequency: 6 cycles/s (Hz) 1 0.5 0 0 -0.5 -0.5 -1 -1 0 1 0 1 Time (s) Figure A1. Waveforms of a low (a) and higher (b) frequency continuous sound wave. 74
Amplitude Frequency (kHz) 1 a) quieter sound 1 b) louder sound 0.5 0.5 0 0 -0.5 -0.5 -1 -1 0 1 0 1 Time (s) Figure A2. Waveforms of a quiet (a) and a louder (b) continuous sound wave of the same frequency. a) b) Time (s) Figure A3. Spectograms of a) the continuous and narrowband sound of a) killer whale whistle, and b) the pulsed and broadband sound of pile driving. At age 10, the typical human hearing range is between 20 Hz and 20,000 Hz (20 kHz). However, we do not hear equally well at all of the frequencies in between. Hearing tests, or audiograms, have shown that human peak hearing frequencies range between 2-4 kHz, and fall off at frequencies above and below this range. You can make your own audiogram at www.myhearingtest.net Audiograms have been undertaken for a number of marine animals, and have been used as a tool to determine noise exposure criteria. In the US, for the purposes of developing noise exposure criteria, marine mammals have been divided into functional groups depending on their best hearing sensitivity (Southall et al., 2007). 75
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Finding Management Solutions for Un
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EXECUTIVE SUMMARY .................
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EXECUTIVE SUMMARY Recognizing that
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ACKNOWLEDGEMENTS WWF Canada is grat
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Acoustic reserves as a strategy to
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Pressure amplitude rms amplitude =
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Rodkin, R.B. and J. A. Reyff. 2008.
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Figure 4. Number of vessel visits b
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extent, the shared vessel traffic 7
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No. of Detection Days whales spread
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III - TOOLS TO MANAGE NOISE: MPAs M
Page 23 and 24: do to the ocean’s biodiversity (o
Page 25 and 26: Figure 8. Summary of the EU Marine
Page 27 and 28: activities are subject to the Act
Page 29 and 30: Hatch, L.T., C.W. Clark, S.M. Van P
Page 31 and 32: At the operations stage, Northern G
Page 34 and 35: Mechanisms for Managing Underwater
Page 36 and 37: The acoustic environment can be a f
Page 38 and 39: Hobday et al., 2011; Lawson & Lesag
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Page 42 and 43: A Compensation and Mitigation Strat
Page 44 and 45: equirements that vessels meet noise
Page 46 and 47: develop a 3 year work plan for envi
Page 48 and 49: For the future, the IMO Energy Effi
Page 50 and 51: The CG prepared a report for DE 56
Page 52 and 53: The IMO and Potential Solutions for
Page 54 and 55: Consider a zoned approach, with a c
Page 56 and 57: There are multiple approaches that
Page 58 and 59: D. What could we achieve within the
Page 60 and 61: Push for administrative actions. Th
Page 62 and 63: Address masking, a significant thre
Page 64 and 65: The Federal government should suppo
Page 66 and 67: speaker) revealed that only 11 of 1
Page 68 and 69: As part of the efforts by the volun
Page 70 and 71: Friday June 7, 2013 Time Activity S
Page 72 and 73: First Name Last Name Affiliation Do
Page 76 and 77: Table A2. The five functional heari
Page 78 and 79: There are a number of ways to descr
Page 80 and 81: Amplitude 1 0.5 Rise time 0 -0.5 .0
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Page 86 and 87: Henderson, D. 2007. Creation of noi
Page 88 and 89: Underwater noise and other forms of
Page 90 and 91: iological diversity, fish populatio
Page 92 and 93: If the impacts cannot be mitigated,
Page 94 and 95: ii PROVISIONS FOR REDUCTION OF NOIS
Page 96: xix xx Fisheries Act,RSC 1985, c F-
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