Abstract
In this paper we discuss the intensity fluctuation characteristics of 400-Hz acoustic transmissions made in the Mid-Atlantic Bight during the summer of 1996. The transmissions traversed variable topography, the dynamic shelfbreak front, and strong nonlinear internal waves, all of which affected the acoustic propagation. In studying the intensity fluctuations, we look both at data from the PRIMER vertical line array receiver and at output from a broadband parabolic equation model intended to simulate the experimental conditions with high fidelity. The statistics of the fluctuations, the physical causes of the fluctuations, and the correlation with the oceanographic forcing in different frequency bands (subtidal, tidal, and high frequency) all are examined. [Work supported by ONR.]
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