A three-dimensional coupled normal mode model for sound propagation in shallow water with irregular bottom bathymetry.
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Authors
Sagos, George A.
Subjects
Ocean acoustics
Coupled Normal Modes
Coupled Normal Modes
Advisors
Chiu, Ching-Sang
Miller, James H.
Date of Issue
1992-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A three-dimensional (3D) coupled normal mode model for studying
sound propagation in a complex coastal environment is developed.
This development corresponds to a significant upgrade of an earlier
version of the model in which a flat, rigid bottom was used. By
imposing the general boundary conditions for an irregular, nonrigid
bottom, the coupling coefficient integrals in the system of
differential equations governing the mode amplitude are reformulated.
The model upgrade entails a numerical implementation of
the revised formulae. With the improved physics, this latest
version is capable of modeling the 3D acoustic wave-field in
shallow water where sound speed, water depth and sediment
properties can vary with horizontal location. To demonstrate this
enhanced capability, the model is used here to simulate the interactions of the normal modes as they propagate up a sloping
bottom.
Type
Thesis
Description
Series/Report No
Department
Electrical Engineering
Engineering Acoustics
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
62 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.