碩士 / 國立中山大學 / 海洋環境工程研究所 / 85 / Traditionally, in treating wave propagation in an ocean waveguide, the density is assume to be a constant in the media. However, geological evidence, e.g., Hamilton [?], suggests that there exists a transition layer in the water-sediemnt interface, in which the density varies continuously and graduately in the layer. The objective of this thesis project is to study the effect of a such transition layer on the wave propagation and noise generation in a waveguide environment.
The theory of this thesis is based upon the formulation developed by Robins [?] for the solution of the Helmholtz equation in the transition layer, and the noise model developed by Kuperman and Ingenito [?]. For simplification, the elasticity of the medium is not included in this study.
The first part of the thesis is to study the reflection coefficient from a transition layer with density variation. The emphases have been placed on the understanding of the reflection mechanisms. Then, the transition layer is added into an ocean waveguide to examine the effect of a such layer on a waveguide propogation.
Many numerical results, including wavenumber spectra, noise intensities, spatial correlation functions, and the energy spectra, are generated and analyzed.
| Identifer | oai:union.ndltd.org:TW/085NSYS3282010 |
| Date | January 1997 |
| Creators | Tsai, Yih-Ching, 蔡亦清 |
| Contributors | 劉金源 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 91 |
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