Propagation of Sound from a Fluid Wedge into a Fast Fluid Bottom
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Authors
Coppens, Alan B.
Sanders, James V.
Subjects
Advisors
Date of Issue
1980-07
Date
Publisher
Language
Abstract
When sound propagates up the continental shelf towards the shore, there is
a loss of lower frequencies. The distances from the shore at which each
frequency is lost correspond closely to the depth at which normal modes in
the shallow-water channel would be cut off. After cut-off is reached for a
specific frequency, the associated energy in that normal mode is dumped
into the bottom forming a highly collimated beam with a shallow angle of
depression. This problem is modelled by a wedge of fluid overlying a fast
fluid bottom. The method of images is used to calculate the distribution
of pressure and its phase at the interface; the interface is then treated
as a distribution of sources and the radiated field in the bottom is
calculated by the Green's function integral technique. Both calculations
require a high-speed digital computer. The results of these programs
compare well with laboratory experiments performed at the Naval Postgraduate School. The results of these programs are presently in the
process of being analyzed to determine the parametric dependence of the
beam on the angle subtended by the wedge and on the properties of the
fluids in the wedge and bottom.
Type
Abstract
Description
Saclantcen Conference Proceedings No. 27
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
2 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.