The problem of coherent reflecton of an acoustic plane wave from a random seabed consisting of a randomly
inhomogeneous sediment layer overlying a uniform elastic sea floor is considered in this analysis.
The random perturbation in the sediment layer is attributable to the sound-speed variations,
resulting in volume scattering due to medium inhomogenieties.
An approach based upon perturbation theory, combining with a derived Green's function for a slab bounded above and
below respectively by a fluid and an elastic half space ,is employed to obtain an analytic solution for the coherent field
in the sediment layer. A linear system is then constructed to facilitate the analysis of the coherent reflection field.
The results of the coherent reflection coefficient for various sediment randomness, frequency , sediment thickness, and
sea floor elasticity have been numerically generated and analyzed. It was found that the higher/larger size of randomness
, frequency, thickness, and shear-wave speed, the lower the coherent reflection. Physical interpretation for the
characteristics of various results were provided.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0809101-132337 |
| Date | 09 August 2001 |
| Creators | Shen, Chien-Ou |
| Contributors | Jin-Yuan Liu, S. S. Leu, R. J. Shyu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809101-132337 |
| Rights | unrestricted, Copyright information available at source archive |
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