2019_programme: IN SITU MEASUREMENTS OF SEDIMENT SOUND SPEED AND ATTENUATION FROM LOW- TO MID-FREQUENCIES

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  • Session: 12. Marine sediment acoustics
    Organiser(s): Ballard Megan , Lee Kevin
  • Lecture: IN SITU MEASUREMENTS OF SEDIMENT SOUND SPEED AND ATTENUATION FROM LOW- TO MID-FREQUENCIES [invited]
    Paper ID: 1012
    Author(s): Yang Jie, Jackson Darrell R.
    Presenter: Yang Jie
    Presentation type: oral
    Abstract: Sediment sound speed and attenuation are, in many cases, the most important parameters for modeling sound propagation and reverberation in littoral oceans. These parameters, however, are difficult to measure from low- to mid-frequencies. In addition, the variation of these parameters in both space, i.e., depth and range, and frequency needs to be addressed for modeling purposes. In this talk, in situ sediment sound speed and attenuation measured in three major field experiments, Shallow Water 2006 (SW06), Target and Reverberation Experiment 2013 (TREX13), and Seabed Characterization Experiment 2017 (SBCEX17), are presented. Sediment sound speed and attenuation within the surficial 3 m of sediments were obtained, using the Sediment Acoustic-speed Measurement System (SAMS). SAMS consists of ten fixed sources and one receiver which is driven into the seabed. The ten sources combined cover a frequency band of 0.5–10 kHz. The three field experiments include a wide range of sediment types, from soft mud to coarse sand. Sediment sound speed and attenuation were observed to vary considerably in both space and frequency domains. With SAMS data taken from a wide range of sediment types, preliminary sediment acoustic modeling work is presented in the pursuit of a better understanding of the physical mechanisms that control the frequency dependencies of sound speed and attenuation. [Work supported by Office of Naval Research.]
  • Corresponding author: Dr Yang Jie
    Affiliation: Applied Physics Lab, University of Washington
    Country: United States
    e-mail:

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