Frequency dependence of sound transmitted from an airborne source into the ocean
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Authors
Helbig, R. A.
Medwin, Herman
Subjects
Sound refraction, rough-surface transmission.
Advisors
Date of Issue
1972-05-15
Date
5/15/1972
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The predicted dependence of sound transmission on the statistics of the randomly-rough interface between dissimilar fluids has been studied by use of the Helmholtz Integral. The predictions have been verified for radiation from a helicopter hovering, and slowly moving, over the sea, for frequencies to 1000 Hz for a wide range of slowly moving, over the sea, for frequencies to 1000 Hz for a wide range of surface acoustical roughnesses. The roughness parameters are the rms height of the surface, propagation constant, speed of propagation and angle with the normal, respectively. The transmission change of sound pressure as a function of frequency is presented for several conditions of an SH3-D helicopter hovering and flying over or near an array of microphone and sonobuoy hydrophones. (Author)
Type
Technical Report
Description
Series/Report No
Department
Ocean Physics Group
Physics
Identifiers
NPS Report Number
NPS-61Md72051A
Sponsors
Funder
Format
59 p. : ill. ; 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.