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Outline

Outline. Preliminary Results James H. Miller and Gopu R. Potty. Glider acoustics Combustive sound source inversions 3D effects of front and internal waves Papers in progress. Hydrophone Mounted on Slocum Glider. Results Initial test worked well ~1/2 hour of data

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Outline

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  1. Outline Preliminary Results James H. Miller and Gopu R. Potty • Glider acoustics • Combustive sound source inversions • 3D effects of front and internal waves • Papers in progress

  2. Hydrophone Mounted on Slocum Glider • Results • Initial test worked well ~1/2 hour of data • Full test glider flew 200km over 14 days! • Undocumented software feature in Bioprobe caused early termination • Another test planned for this winter Towed configuration

  3. Single Phone Data from Glider Glider whine 400 Hz WHOI tomo source 300 Hz NRL FM chirps 224 Hz WHOI tomo source 200 Hz Miami source Collaborators: Jason Holmes, Jim Lynch, Scott Glenn, Josh Kohut, Hugh Roarty Glider ‘Clicks’

  4. Glider Location Acoustic glider location

  5. Measured Phase Stability 224 Hz WHOI source Miami sound machine Glider click Miami sound machine on Glider click Phase of 224 Hz source stable and linear over time

  6. Synthetic Aperture Output Glider click • 224 Hz tomography signal carrier • Beamformer turned on at 50 seconds

  7. Synthetic Aperture Beamformer 224 Hz carrier MSM 200 Hz tomo sideband?

  8. Pulse compressed MSM Interference Glider click Mode 2 Mode 1

  9. Combustive Sound Source (CSS) Data on the SHRUs • Source deployed from R/V Knorr by Preston Wilson/ David Knobles • Source waveform monitored • Source depth ~ 26 m • Inversions using CSS data (using mode travel times) • Collaborators: Lynch, Newhall, Wilson, Knobles, Hodgkiss, Chapman Shru 1; 15.27 km Mode 2 Mode 1

  10. Frontal Reflection Effects on CW TL Source Receiver 10o C 1 km Front Range 15o C Fixed frequency= 200 Hz Varying range Lynch, J.F.; Colosi, J.A.; Gawarkiewicz, G.; Duda, T.F.; Pierce, A.D.; Badiey, M.; Katsnelson, B.G.; Miller, J.H.; Siegmann, W.; Chiu, C.-S.; Newhall, A.,“Consideration of Fine-Scale Coastal Oceanography and 3-D Acoustics Effects for the ESME Sound Exposure Model,” IEEE J. Ocean. Eng., 31, (1), 33 – 48, (2006).

  11. J-15 Tow Parallel to the Shelf Break Front 28.2 km Frequency – 93 Hz Source depth ~ 50 m Source Level – 165 – 168 dB Collaborators: Lynch, Newhall, Badiey, Duda, Gawarkiewicz 30.3 km 34.7 km

  12. Knorr 3D J-15 Run Track Shark This image 16 hours later than transect, Internal wave seen on ship’s radar inshore of Knorr at 11 PM Local (0400 GMT 9/5/06)

  13. J-15 Tow Parallel to the Front: Model Frequency – 93 Hz Source depth ~ 50 m Source Level – 165 – 168 dB Collaborators: Lynch, Newhall Ship track Internal wave packet Front 2 modes WHOI HLA/VLA (Shark)

  14. 28.2 km J-15 Tow Parallel to the Front: Data Frequency – 93 Hz Source depth ~ 50 m Source Level – 165 – 168 dB Collaborators: Lynch, Newhall Data shows 20 dB increase, model only 10 dB. Where is the other 10 dB coming from? Curvature of front? Internal wave structure? Knorr track Internal wave packet Front 34.7 km J-15 on Range km 25 30 35 40 45 50

  15. ASA Meeting - Abstracts • The effect of a rough sea surface on acoustic normal modes (Miller and Lynch -Medwin session, invited) • Observations of phase and travel time variations of normal modes during Tropical Storms Ernesto and Florence (Langer, Miller, Potty, Lynch, Newhall) • Geoacoustic inversion using combustive sound source signals (Potty, Miller, Wilson, Lynch, Newhall) • Acoustic measurements in shallow water using an ocean glider (Georges A. Dossot, James H. Miller, Gopu R. Potty, Kristy A. Moore, Jason D. Holmes, Scott • Glenn, and Jim Lynch) • 5. Investigation of 3D propagation effects at the New Jersey shelf break front (Kristy A. Moore, James H. Miller, Gopu R. Potty, Georges Dossot, James Lynch, Arthur Newhall, and Glen Gawarkiewicz)

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