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Discrimination between discrete and continuum scattering from the sub-seafloor.

Charles W Holland1, Gavin Steininger2, Stan E Dosso2

  • 1Applied Research Laboratory, The Pennsylvania State University, State College, Pennsylvania 16804, USA.

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Acoustic remote sensing can distinguish between different types of seabed sediment heterogeneities. This helps scientists better understand the marine benthic environment by identifying volume scattering from discrete particles versus continuum fluctuations.

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Area of Science:

  • Marine geophysics
  • Acoustic remote sensing
  • Sediment characterization

Background:

  • Seabed scattering is primarily influenced by sediment volume heterogeneities, not just seafloor roughness.
  • Sediment heterogeneities are theoretically modeled as either a fluctuation continuum or discrete particles.
  • Experimental data often lacks a priori information, forcing arbitrary model selection.

Purpose of the Study:

  • To demonstrate the acoustic discrimination between continuum and discrete sediment heterogeneities.
  • To provide a method for characterizing marine sediment properties remotely.
  • To improve understanding of the marine benthic environment.

Main Methods:

  • Analysis of acoustic scattering data based on spectral exponent (γ3).
  • Application of theoretical models for continuum and discrete scatterers.
  • Investigation of physical bounds on parameter values for discrimination.

Main Results:

  • Acoustic discrimination is possible when the spectral exponent γ3 > 4 (continuum) or γ3 ≤ 2 (discrete).
  • Discrimination is sometimes feasible in the range 2 < γ3 ≤ 4 using physical parameter bounds.
  • This acoustic method offers a way to measure small-scale sediment heterogeneities over large areas.

Conclusions:

  • Acoustic remote sensing can differentiate between continuum and discrete sediment heterogeneities.
  • This capability addresses a gap in measuring small-scale sediment features across broad regions.
  • Improved characterization of sediment heterogeneities will enhance our understanding of the marine benthic environment.