A numerical method for solving for normal modes with impedance bottom
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Authors
Cantley, Douglas
Subjects
Normal modes
Fast Field Program
Impedance bottom
Propagation loss
Fast Field Program
Impedance bottom
Propagation loss
Advisors
Coppens, Alan B.
Gabrielson, Thomas B.
Date of Issue
1986-12
Date
December 1986
Publisher
Language
en_US
Abstract
This thesis describes the development of a computer program that calculates the propagation loss for low frequencies in a shallow ocean given the depth of source and receiver, the sound speed profile of the water, the frequency of the source, and the impedance and sound speed in the bottom. The program does this by computing the sum of normal modes for a specified set of boundary conditions. At the surface perfect pressure release is assumed, and the boundary condition at the bottom is one of impedance mismatch. An effort was made to develop a Fast Field Program, which would use a FFT to predict propagation loss at a variety of ranges by solving for a discrete set of wave numbers, but development was not completed.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
98 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
Copyright is reserved by the copyright owner