Remote sensing of ocean sediment volume reverberation

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Author
Chang, Chin-wen
Date
1986-12Advisor
Sanders, James V.
Coppens, Alan B.
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Show full item recordAbstract
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. A
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 the experimental results, the volume scattering coefficient obtained for the
aggregate is 0.0624 ± 0.007 m" 3 and for fine sand is 0.0413 ± 0.007 m" 3
. The latter
result is close to the coefficient obtained from a cloud-of-small-spheres model for
wavelengths much greater than the particle size.
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