A STEP-WISE COUPLED MODE MODEL FOR ACOUSTIC WAVEGUIDES

Authors
  1. Brooke, G.H.
  2. Fawcett, J.A.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Step-wise coupled-mode propagation models have been used to model acoustic propagation in range-dependent environments such as those considered for Matched Field Processing applications. The method presented here is being investigated for two reasons, namely (i) it is a proven method which will provide reference solutions for comparison with alternative coupled-mode methods being developed that (ii) it is a potential candidate for Matched Field Processing applications in range-dependent environments where Adiabatic Modes may not be applicable. Scattering due to a single abrupt discontinuity in an acoustic Pekeris waveguide is considered. Discrete mode scattering coefficients are obtained using an approach similar to Evans. Here the waveguide is bounded below by a perfectly-reflecting ridgid boundary. Introduction of the lower reflector effectively discretizes the continuous spectrum of the unbounded Pekeris waveguide and allows its contribution to the scattering to be cast in terms of an infinite set of discrete modes. The presence of the bound introduces a degree of variability into the scattering coefficients; however, by averaging over a well defined range of bound locations it is possible to obtain accurate values. TRUNCATED.
Report Number
DREP-TM-93-40 — Technical Memorandum
Date of publication
01 Mar 1993
Number of Pages
25
DSTKIM No
93-03636
CANDIS No
134548
Format(s):
Hardcopy;Originator's fiche received by DSIS

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