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Three-dimensional density spectra of sandy sediments

Tang1, Orsi

  • 1Applied Physics Laboratory, University of Washington, Seattle 98105, USA.

The Journal of the Acoustical Society of America
|May 2, 2000
PubMed
Summary

Density variations in Florida sandy sediments were analyzed using X-ray CT scans. Shells and mud dominate large scales, while sand grain contacts are key at small scales, impacting sound scattering.

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Evaluation of sound propagation models used in bottom volume scattering studies

The Journal of the Acoustical Society of America·2000

Area of Science:

  • Geophysics
  • Sedimentology
  • Acoustics

Background:

  • Understanding sediment density variations is crucial for geophysical and acoustic studies.
  • Previous models often simplify the complex density structure of sandy sediments.

Purpose of the Study:

  • To model the power spectra of density variability in sandy sediments offshore Panama City, Florida.
  • To identify the primary contributors to density variations at different scales.
  • To investigate the implications for high-frequency sound scattering.

Main Methods:

  • Digital X-ray computed tomography (CT) imaging of sediment structure.
  • Spectral analysis of density variations.
  • Development of an analytic model for the sediment power spectrum.

Main Results:

  • Shell pieces and mud mixtures significantly contribute to density variability at large scales.
  • Intrinsic density variability of sand grain contacts dominates at small scales.
  • A two-component power-law model was developed, with a dominant term exhibiting a higher exponent than previously reported.

Conclusions:

  • The developed model accurately represents the density variability of sandy sediments.
  • The findings provide new insights into the acoustic properties of sandy sediments.
  • This research has implications for understanding sound propagation and scattering in marine environments.

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