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Talks and Poster Presentations (without Proceedings-Entry):

P. Borejko:
"An Examination of Acoustic Propagation Effects in a Perfect Wedge";
Talk: 8th International Conference on Theoretical and Computational Acoustics ICTCA 2007, Heraklion, Crete, Greece (invited); 2007-07-02 - 2007-07-05.



English abstract:
The perfect-wedge model, a constant-density isospeed layer of fluid with a pressure-release horizontal surface and a rigid sloping bottom, has offered some insight into the role of sloping ocean bottom in acoustic propagation from an underwater source. This paper discusses some new results for small and large range propagation in this model. A general solution for the acoustic field due to an arbitrary time variation of the pressure at the source point is given. The time records of the pressure and their FFT and time-frequency amplitude spectra are shown and discussed at range and cross-range locations. When the receiver recedes up- or cross-slope from the source, the duration of the record is shortened, but when the receiver recedes down-slope from the source, the duration of the record remains constant. Large range cross-slope propagation, affected by horizontal refraction and backscattering, is highly dispersive, while large range down-slope propagation, exclusively affected by backscattering, seems to be nondispersive for the selected frequency band of the point source.

Keywords:
Wave Propagation, Theoretical and Computational Acoustics


Electronic version of the publication:
http://publik.tuwien.ac.at/files/pub-bi_7880.pdf


Created from the Publication Database of the Vienna University of Technology.