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Report No. 6945 BBN Systems and Technology Corporation Table A. 7. Greene ( 1987) Data 1 /3 Octave Spectra, dB re. 1 uPa at 1 m*. Caisson EXPLORER BEAVER Island I I KULLUK MACKENSIE AQUARIUS 1/3 Oct. Drilling Drilling Drilling Dredging Dredging (Hz) Est. L, Est. Ls Est. Ls Est. L, Est. bs "Source level estimated using BBN TL data.
Report No. 6945 BBN Systems and Technology Corporation APPENDIX B: ANALYSIS OF ICEBREAKING SOUNDS* B.l Introduction The drillship CANMAR EXPLORER I1 was drilling an exploratory well at the Corona drillsite in early September 1986. Corona is in the Alaskan Beaufort Sea, north of Camden ~ a northwest ~ , of Barter Island, about 22 n mi offshore where the water depth is 35 m. As part of a planned, comprehensive sound monitoring effort, recordings were made of the underwater sounds from the support vessel ROBERT LEMEUR while it was icebreaking. In particular, sounds were recorded continuously for 14 minutes at range 0.25 n mi (0.46 km) . A detailed report of the sound monitoring results was published (Greene. 1987), but not every interest in the recorded data was recognized during the original analysis. For instance, although the sound levels vs distance from the icebreaker were analyzed and reported, no extended time series of sound levels from icebreaking were investigated. In assessing the possible impact of such sounds of wildlife, knowledge of the variation in sound levels with time might be important. Hence, additional analysis has been performed on the 14 minute segment of icebreaking sounds, range 0.25 n mi. B.2 Methods The R/V JUDY ANN, a 43-ft fishing boat, had been chartered to serve as a sound boat for underwater acoustical measurements of the drillship and its support vessels. The boat's engines were shut down during recording. Hydrophones made by International Transducer Corporation (model 6050C) were suspended beneath a lightly-tethered sparbuoy at depths 9, 18, and 30 m. the hydrophones included a low-noise preamplifier and had a flat receiving response from below 20 Hz to above 8 kHz. The in-water cables were faired to prevent strumming. Signals from the three hydrophones were further amplified, if necessary, to obtain the best dynamic range on the tape recorder. the p.ostamplifier gains could be set in steps of 10 dB from 0 to 40 dB. The audio cassette tape recorder was a four-channel Fostex model 250. The sound "Charles R. Greene, Jr., Greeneridge Sciences, Inc.
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Report No. 6945 L 1 A. Baird's Beak
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on the ice. The single calves remai
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FIG. 3.2 NOISE SPECTRA IN SHALLOW W
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Adapted From K.H. Jacob (1986) Cali
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FIG. 3.8 ESTIMATED OVERALL SOUND LE
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FIG. 3. Q UNDERWATER NOISE SPECTRA
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FIG- 3.1 1 STATISTICAL ANALYSIS OF
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FIG- 3-12 STATISTICAL ANALYSIS OF C
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-- Alr Gun Array + Vlbrosels -* Ice
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FIG. 3.14 REPRESENTATIVE SHIPS AND
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~ -- -- FIG. 3.1 7 REPRESENTATIVE R
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FIG. 3-18 REPRESENTATIVE CULTURAL S
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FIG. 4.1 CORRECTION TO 300 M REFERE
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FIG. 4.1 1 AIR TO SHALLOW WATER SOU
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