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Nonlinear frequency-dependent attenuation in sandy sediments.

J D Holmes, W M Carey, S M Dediu

    The Journal of the Acoustical Society of America
    |June 7, 2007
    PubMed
    Summary
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    Sound attenuation in shallow water shows a nonlinear frequency dependence, especially in sandy sediments. This finding aligns with Biot

    Area of Science:

    • Acoustics
    • Geophysics
    • Physical Oceanography

    Background:

    • Investigates compressional wave attenuation in shallow-water waveguides with sandy sediment bottoms.
    • Focuses on the frequency dependence of sound attenuation, a critical factor in underwater acoustics.

    Discussion:

    • Sediment attenuation follows a power law, alpha(f) = alpha(f(o)) x (f/f(o))n, with n approximately 1.8 +/- 0.2 for frequencies below 1 kHz.
    • This empirical result closely matches the theoretical expectation (n=2) proposed by Biot.
    • Sediment layers near the water-sediment interface significantly influence attenuation below 10 kHz.

    Key Insights:

    • Demonstrates a nonlinear frequency dependence of sound attenuation in shallow marine environments.
    • Highlights the crucial role of sandy sediment properties in sound wave propagation.

    Related Experiment Videos

  • Confirms Biot's theory on sediment acoustic attenuation at lower frequencies.

    • Outlook:

    • Accurate sound transmission modeling in shallow water necessitates incorporating depth-dependent sound speed, density, and frequency-dependent attenuation.
    • Further research can explore variations in sediment composition and waveguide geometry.