Testing the accuracy of a three-dimensional acoustic coupled mode model

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Authors
Ogawa, Hiroyuki
Subjects
Ocean acoustics
Normal mode
Parabolic equation
Advisors
Chiu, Ching-Sang
Ehret, Laura L.
Date of Issue
1991-12
Date
December 1991
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The three-dimensional coupled mode sound propagation model of Chiu and Ehret (1990) is tested for its accuracy in modeling horizontal sound refraction. The test is achieved by comparing results generated by this model with exact analytic solutions to a parabolic approximation of the Helmholz Equation (Seigman, et al., 1990). Specifically, the acoustic wavefields associated with two cases of horizontally variable sound speed are considered. In Case I the sound speed varies only with azimuth, while in Case II there is radial and azimuth variation. The acoustic quantities used for the comparison included the modal modulation envelopes and transmission loss. Errors in the mode amplitude and phase are quantified and the significance of horizontal refraction is discussed.
Type
Thesis
Description
URI
https://hdl.handle.net/10945/26806
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
45 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner
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