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A Study of Low Frequency Sound Propagation in Shallow Water Ducts
NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT
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This paper presents results from a recent investigation of shallow water propagation loss for low frequencies 500-4000 Hz. Shallow water is defined in this context as a location where acoustic energy has numerous boundary interactions. This definition leads to both physically shallow and not- so-shallow sites. The objectives of this investigation are, first, to gain a quantitative understanding of propagation loss as a function of sourcereceiver placement and frequency for numerous shallow water environments, in this case, for 10 geographic areas across all four seasons second, to gain quantitative information of surface duct versus downward refracting propagation by using a statistical approach, and third, to address questions concerning frequencies which are supported in ducting propagation, effects of duct transmission loss in shallow water, and the impact of sourcereceiver placement in shallow water.
APPROVED FOR PUBLIC RELEASE