2025_programme: Acoustic scattering from gassy sediments: Modeling and observations at Lake Kinneret, Israel

• Day: June 19, Thursday
    Location / Time: C. THALIA at 14:50-15:10
• Last minutes changes: -
• Session: 15. Seabed Acoustics
  Organiser(s): Megan Ballard, Kevin Lee, Nick Chotiros
  Chairperson(s): Traci Neilsen
• Lecture: Acoustic scattering from gassy sediments: Modeling and observations at Lake Kinneret, Israel [Invited]
  Paper ID: 2290
  Author(s): Anatoliy Ivakin, Boris Katsnelson, Regina Katsman
  Presenter: Anatoliy Ivakin
  Abstract: Presence of even relatively small volume fraction of gas bubbles can significantly change effective acoustic properties of underwater sediments and, particularly, sound speed and attenuation, reflectivity of interfaces and volume scattering strength. This paper presents a model of scattering that quantifies relationships of these parameters with acoustic response from gassy sediments and discusses results of computer simulations for time- (or range-) series of the backscatter intensity, a usual output of acoustic profiling systems. Along with the system characteristics, such as transmitted signal shape, directivity, and used acoustic frequencies, critical inputs to this model are volume concentration, the equivalent radius of gas bubbles, and their spatial distributions in the sediment (for instance, the bubble layer thickness and depth under the water-sediment interface). Typical values of these inputs and their variations are taken from previous observations at Lake Kinneret (Sea of Galilee), Israel. Computer simulations are used to evaluate the sensitivity of the acoustic system response to various parameters of gassy sediments and to develop the remote sensing methodology and optimal design of future experiments. [Work supported by BSF, United States - Israel Binational Science Foundation].
• Corresponding author: Dr Anatoliy Ivakin
  Affiliation: University of Washington
  Country: United States