Abstract
Experimental measurements have been conducted over a laboratory scale model of the Santa Lucia Escarpment for the purpose of analyzing two- and three-dimensional underwater sound propagation. Transmission loss (TL) was measured as a function of depth at a series of ranges in the downslope direction of the model (referred to as depth profile measurements) and TL was also measured over a finite area in the horizontal plane for fixed source and receiver depths (referred to as two-dimensional surveys). The two-dimensional surveys show across slope interference, which may be indicative of bathymetric refraction, and the modal structure of the depth profile measurements appears to change as a function of downslope range (a result which may be caused by mode coupling). In order to investigate the interference observed in the two-dimensional surveys and also determine if the range-dependent variation in the depth profile measurements is being caused by mode coupling, an inversion algorithm was applied to measurements of the complex pressure field for the purpose of extracting the modal amplitudes. Analysis of the experimentally extracted modal amplitudes indicates that mode coupling and bathymetric refraction contributed significantly to the acoustic pressure field. [Work supported by ONR.]
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