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Geoacoustic inversion using multipath pulse shape.

Mark K Prior1, Chris H Harrison, Peter L Nielsen

  • 1NATO Undersea Research Centre, Viale S. Bartolomeo 400, 19138 La Spezia, Italy. prior@nurc.nato.int

The Journal of the Acoustical Society of America
|February 6, 2008
PubMed
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This study validates existing acoustic models for shallow ocean environments. The findings show that seabed properties significantly influence sound intensity decay, enabling accurate seabed characterization using sound propagation data.

Area of Science:

  • Ocean acoustics
  • Underwater sound propagation
  • Seabed acoustic properties

Background:

  • Existing acoustic models accurately describe received sound intensity over time in shallow waters.
  • The influence of the sea-water sound speed profile diminishes after peak intensity arrival.

Purpose of the Study:

  • To demonstrate that a method for determining seabed acoustic properties, previously limited to isovelocity water columns, can be applied in the presence of a sound-speed profile.
  • To characterize average seabed properties and detect changes in seabed type using acoustic propagation measurements.

Main Methods:

  • Utilizing experimental data from a shallow water region in the Mediterranean Sea.
  • Applying expressions that describe received intensity variation with time.

Related Experiment Videos

  • Relating the decay rate of smeared multipath arrivals to the angular derivative of seabed reflection loss.

    • Main Results:

    • Received intensity decay is primarily governed by seabed acoustic properties, similar to an isovelocity water column.
    • The method successfully determined average seabed properties and identified changes in seabed type from two datasets.
    • Predicted received intensity, based on derived seabed properties, closely matched propagation measurements.

    Conclusions:

    • The established method for seabed acoustic property determination is effective even with a sound-speed profile.
    • Accurate seabed characterization is achievable through analysis of sound intensity decay in shallow water.
    • This research enhances the understanding of underwater sound propagation and seabed interaction.