2019_programme: MEASURING SEABED PROPERTIES OF THE NEW ENGLAND MUD PATCH USING AMBIENT NOISE COHERENCE

• Session: 12. Marine sediment acoustics
  Organiser(s): Ballard Megan , Lee Kevin
• Lecture: MEASURING SEABED PROPERTIES OF THE NEW ENGLAND MUD PATCH USING AMBIENT NOISE COHERENCE [invited]
  Paper ID: 906
  Author(s): Barclay David, Bevans Dieter, Buckingham Michael
  Presenter: Barclay David
  Presentation type: oral
  Abstract: During the Seabed Characterization Experiment, a multi-institutional field effort held at the New England mud patch, the autonomous passive acoustic lander Deep Sound made a series of ambient noise measurements from the seafloor. The instrument platform carried four hydrophones, arranged in an inverted ‘T’ shape with three spaced in the horizontal and two in the vertical, and landed on the seafloor with the bottom phones 30 cm above the interface. Pressure time series, vertical and horizontal noise coherence (directionality), were recorded continuously for periods of 9 hours over the acoustic bandwidth of 5 Hz to 30 kHz, along with the local temperature, conductivity, and depth at five different sites. A full wavenumber integral noise model of the vertical coherence in a shallow-water waveguide bounded by a muddy seabed overlying an infinite sandy bottom half-space was fitted to the data. The best fit model returns the frequency dependent compressional and sheer speeds, compressional and sheer attenuations, mud layer thickness, and densities in the mud and sand layers. (Research supported by ONR)
• Corresponding author: Dr Barclay David
  Affiliation: Dalhousie University
  Country: Canada
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