Abstract
Recent broadband (50–500 Hz) matched-field inversions of geoacoustic parameters indicated that sediment attenuation is difficult to estimate especially at short source-receiver distances. On the other hand, geoacoustic inversions become less practical at long source-receiver distances due to the range-dependency of both ocean bottom and water column. Several inversion techniques are investigated to estimate in-situ sediment attenuation from normal incidence reflection data, collected by chirp sonars. Both frequency-shift and attenuation roll-off measurement techniques showed nonlinear frequency dependency of attenuation for sandy sediments at the 2-12-kHz frequency band. Estimated attenuation values are extrapolated to lower frequencies by using the Biot theory. The extrapolated results are consistent with those of the matched-field inversions. Several advantages and limitations of the frequency-shift and attenuation roll-off measurement techniques are also discussed. [Work supported by ONR.]
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