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Model-based seafloor characterization employing multi-beam angular backscatter data--a comparative study with

K Haris1, Bishwajit Chakraborty, Chanchal De

  • 1National Institute of Oceanography, Council of Scientific and Industrial Research, Dona Paula, Goa 403 004, India.

The Journal of the Acoustical Society of America
|January 10, 2012
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Summary
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This study uses multi-beam echo-sounding to analyze seafloor sediment characteristics off Goa, India. Results validate geoacoustic inversion models for understanding continental shelf processes.

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Area of Science:

  • Marine Geophysics
  • Acoustic Remote Sensing

Background:

  • Seafloor characterization is crucial for understanding geological processes.
  • Geoacoustic inversion models require accurate seafloor parameter estimation.

Purpose of the Study:

  • To estimate seafloor geoacoustic parameters using multi-beam echo-sounding data.
  • To validate these parameters against ground truth data and multi-frequency analysis.

Main Methods:

  • Acquisition of multi-beam (MB) echo-sounding data at 95 kHz.
  • Collection of grab sediment samples for ground truth.
  • Application of the composite roughness scattering model to MB backscatter data.
  • Estimation of seafloor parameters (mean grain size, roughness, sediment volume).

Main Results:

  • Distinct sediment provinces were identified based on mean grain size and roughness.
  • Estimated seafloor parameters at 95 kHz were consistent with sediment samples.
  • Model results were validated using data from 33 and 210 kHz.

Conclusions:

  • Multi-beam echo-sounding is effective for sediment characterization.
  • Geoacoustic inversion models provide reliable seafloor parameter estimates.
  • This study enhances understanding of western Indian continental shelf processes.