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Dispersion of Sound in Marine Sediments
VICTORIA UNIV (CANADA) VICTORIA Canada
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The research focus is on inverting modal dispersion relationships to extract geoacoustic model parameters. This approach is well known and has been used to extract information about the ocean bottom from broadband signals measured at long ranges e.g. several tens of kms at which the modes are well separated in time. The overall objective here is to investigate the use of time warping as a means to resolve modes at much shorter ranges. Time warping involves transforming the initial time-frequency domain to a new domain in which the modal dispersion relationships are single tones. Previous work indicated that the time-frequency information was robust to imprecise knowledge of the experimental geometry, and inversion of the modal dispersion provided good estimates of the sediment sound speed Bonnel and Chapman, 2011 Bonnel et al., 2013. The primary objective of this work is to investigate the approach to use the information in the extracted mode amplitudes to invert for sound attenuation marine sediment.
APPROVED FOR PUBLIC RELEASE