This paper studies is considered the problem of coherent re ection of an acoustic plane
wave from a rough seabed with a randomly inhomogeneous sediment layer overlying a
uniform elastic basement. The randomness of the sound eld is attributable to the rough-
ness of the seabed and the sound-speed perturbation in the sediment layer, resulting in a
joint rough surface and volume scattering problem. An approach based upon perturbation
theory, combined with a derived Green's function for a slab bounded above and below by
a uid and an elastic half space, respectively, is employed to obtain an analytic solution
for the coherent eld in the sediment layer. Furthermore, a boundary perturbation the-
ory developed by Kuperman and Schmidt [22] is applied to treat the problem of rough
surface scattering. A linear system is then established to facilitate the computation of the
coherent re ection eld. The coherent re ection coe cients for various surface roughness,
sediment randomness, frequency, sediment thickness, and basement elasticity have been
generated numerically and analyzed. It was found that the higher/larger size of surface
and/or medium randomness, frequency, thickness, and shear-wave speed, the lower the
coherent re ection. Physical interpretations of the various results are provided.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0802102-111337 |
| Date | 02 August 2002 |
| Creators | Hsueh, Ping-Chang |
| Contributors | Jin-Yuan Liu, Cho-Teng Liu, Chau-Chang Wang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0802102-111337 |
| Rights | unrestricted, Copyright information available at source archive |
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