A COUPLED MODE MODEL FOR ACOUSTIC WAVEGUIDES: ROZZI'S CONTINUOUS SPECTRUM APPROACH

Authors
  1. Brooke, G.H.
  2. Fawcett, J.A.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Coupled-mode propagation models, though computationally demanding, may be used to model acoustic propagation in range-dependent environments for which adiabatic normal mode models are inadequate. In this paper, a coupled-mode analysis of the scattering due to an adrupt discontinuity in an acoustic Pekeris waveguide is considered in an attempt to develop more efficient range-dependent propagation models. Analytical expressions for the model scattering coefficients are derived using an approach due to Rozzi in which depth-dependent field quantities are expanded in terms of Laguerre polynomials. Both discrete and continuous spectrum components are treated using the polynomial expansions. Numerical results are presented for three discontinuity configurations and compare favourably with results obtained using two independent methods. Rozzi's method can be extended to treat the scattering from multiple interacting discontinuities.
Report Number
DREP-TM-93-41 — Technical Memorandum
Date of publication
01 Mar 1993
Number of Pages
41
DSTKIM No
93-03639
CANDIS No
134549
Format(s):
Hardcopy;Originator's fiche received by DSIS

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