Abstract
A theory of broadband noise propagation from a point source in shallow water is developed by use of a Pekeris model with a lossy bottom. The broadband interference pattern in the power spectrum is calculated analytically and numerically including both the proper mode and the virtual mode fields. It is shown that the interference maxima of the proper mode spectrum describe straight lines in the range-frequency plane and that the virtual mode fields (branch-line integral) are localized and decay slowly with a range around the cutoff frequencies of the proper modes. It is also shown that bottom attenuation does not influence the form of the power spectrum in any significant way up to ranges of 100 water depths.
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