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Coherent Reflection of Acoustic Plane Wave From a Random Sea floor

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.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0809101-132337
Date09 August 2001
CreatorsShen, Chien-Ou
ContributorsJin-Yuan Liu, S. S. Leu, R. J. Shyu
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0809101-132337
Rightsunrestricted, Copyright information available at source archive

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