Title page for etd-0802102-111337


[Back to Results | New Search]

URN etd-0802102-111337
Author Ping-Chang Hsueh
Author's Email Address m8955604@student.nsysu.edu.tw
Statistics This thesis had been viewed 5587 times. Download 1782 times.
Department Undersea Technology
Year 2001
Semester 2
Degree Master
Type of Document
Language English
Title Coherent Reflection of Acoustic Plane Wave From a Rough Seabed With a Random Sediment Layer Overlying an Elastic Basement
Date of Defense 2002-07-29
Page Count 56
Keyword
  • coherent reflection
  • random sediment layer
  • rough seabed
  • acoustic wave scattering
  • elastic basement
  • Abstract 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.
    Advisory Committee
  • Cho-Teng Liu - chair
  • Chau-Chang Wang - co-chair
  • Jin-Yuan Liu - advisor
  • Files
  • etd-0802102-111337.pdf
  • indicate access worldwide
    Date of Submission 2002-08-02

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys