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ORE 654 Applications of Ocean Acoustics Lecture 6b Ocean Noise

ORE 654 Applications of Ocean Acoustics Lecture 6b Ocean Noise. Bruce Howe Ocean and Resources Engineering School of Ocean and Earth Science and Technology University of Hawai’i at Manoa Fall Semester 2011. Noise. Noise spectra NL = 10 log(<I noise >/I ref ) dB re 1 μPa 2 /Hz Classic

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ORE 654 Applications of Ocean Acoustics Lecture 6b Ocean Noise

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  1. ORE 654Applications of Ocean AcousticsLecture 6bOcean Noise Bruce Howe Ocean and Resources Engineering School of Ocean and Earth Science and Technology University of Hawai’i at Manoa Fall Semester 2011 ORE 654 L5

  2. ORE 654 L1

  3. Noise • Noise spectra • NL = 10 log(<Inoise>/Iref) dB re 1 μPa2/Hz • Classic “Urick” curves ORE 654 L5

  4. Ship noise • Radiated sound Gerald D’Spain ORE 654 L1

  5. Low frequency noise - wind Station ALOHA, 20 months ORE 654 L5

  6. Bioacoustic sound ORE 654 L1

  7. Offshore a military training base D’Spain ORE 654 L1

  8. Measuring wind and rain Rain Wind Rain Nystuen ORE 654 L1 Nystuen

  9. Annual average Andrew, Howe, and Mercer Large whales – using SOSUS All – 6 yrs ORE 654 L1

  10. Bowhead and beluga whale and walrus sounds • Spectrogram of under ice • northernBering Sea in May 2007 ORE 654 L1

  11. Comparison Wenz vs APL vs Ross Ross: Mechanics of Underwater Noise (1976) & Acoustics Bulletin (1993) 159th Meeting of the Acoustical Society of America  Spring 2010: Baltimore

  12. Simplified noise spectra • Low frequency flow turbulence/seismics/wave-wave • Shipping • Wind/waves ORE 654 L5

  13. Simplified noise spectra - terms • Turbulence/microseisms • Shipping • Wind/waves • Thermal ORE 654 L5

  14. Noise • Noise spectra • NL = 10 log(<Inoise>/Iref) dB re 1 μPa2/Hz • Bandwidth Δf • BW = 10 log Δf • Total noise level NLtotal = NL + BW ORE 654 L5

  15. SNR Budget ORE 654 L5

  16. Rms precision of peak locations ORE 654 L5

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