Geoacoustic Inversion of surficial gassy sediment
Hay, A. E.
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Geoacoustic parameters of the seafloor in a coastal environment characterized by a surficial gassy sediment layer are estimated using a geoacoustic inversion method. The analysis combines the inversion algorithm called Adaptive Simplex Simulated Annealing (ASSA) with the Fast Gibbs Sampler (FGS) algorithm, which estimates the parameters uncertainty. The propagation model integrated to the algorithms is a parabolic equation model developed by Thomson. The method was tested using simulated data to highlight the advantages and limitations of the technique in isolating the particularly low sound speed and high attenuation of gassy sediment. Results were then obtained from acoustic data recorded in St. Margaret's Bay, N.S., Canada. The underwater acoustic source signature was composed of 5 tones below 500 Hz. It was recorded on a vertical line array of 11 hydrophones located in a range-independent shallow water environment. The seabed in the area of interest was modelled with two sediment layers over a basement, where the geoacoustic parameters of the top sediment layer as well as the thickness of the second layer were estimated through inversion.
Matthews, M-NR, A. E. Hay, F. Desharnais, and J. Osier. "Geoacoustic Inversion of surficial gassy sediment." Canadian Meteorological and Oceanographic Society, McDonald Building 150 Louis Pasteur, Ste 112 Ottawa, ON, K1N 6N5 Canada. [np]. CMOS Congress 2009 - Sea and Sky Come to Life, Halifax, Nova Scotia (Canada), 31 May - 4 June 2009.