Remote Sensing of Ocean Sediment Volume Reverberation

Abstract

An experimental study was performed to establish a technique for measuring the volume reverberation from ocean sediments. Two types of sediments (aggregate and fine sand) were used in this study. The inhomogeneity within the sediment caused considerable sample to sample fluctuation in the scattered waveform. This fluctuation was removed by spatial averaging to obtain a mean value over the sampling area. An approximate model for volume reverberation from sediments was developed for an acoustic pulse with an exponential decay. The results are promising. Combining the model and experimental results, the volume scattering coefficient obtained for the aggregate is 0.0624 + or - 0.007 m and for fine sand is 0.0413 + or - 0.007 m. The latter result is close to the coefficient obtained from a cloud-of-small spheres model for wavelengths and much greater than the particle size. Keywords: Volume reverberation; Waveform envelope; Transducer; Receiver; Sound speed; Slope; Decay constant; scattering coefficient.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1986
Accession Number
ADA177188

Entities

People

  • Chin-wen Chang

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustics
  • Classification
  • Coefficients
  • Computer Programs
  • Computers
  • Data Acquisition
  • Data Sets
  • Frequency
  • Near Field
  • Remote Sensing
  • Reverberation
  • Scattering
  • Seabed
  • Security
  • Sediments
  • Waveforms
  • Waves

Readers

  • Acoustical Oceanography.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science and Engineering.