Abstract
Ocean environmental acoustic experiments were conducted on the Middle Atlantic Bight during the August 1996 Shelf Break Primer Experiment. Broadband acoustic sources, SUS charges, were dropped across and along the shelf in depths ranging from 85 to 350 m. The experimental data were collected at two veritical hydrophone arrays situated at the top of the shelf. The acoustic signal received was analyzed using a Morlet wavelet. This wavelet analysis enabled time and frequency characteristics to be extracted. Scalograms, representations of the energy distribution in the time-frequency plane, were used to assess the modal dispersion. The group speeds for modes 1–4 at frequencies 15–240 Hz were estimated using the wavelet scalogram. The mode dispersion was dependent upon the bathymetry, depth, and range features of the shelf. A normal mode code was used to compare the observed dispersions with theory. In addition, the influence of the bathymetry, depth, and range features were analyzed for their impact on the modal dispersion. [Work supported by ONR.]
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