title: Coupled perturbed modes over a sloping penetrable bottom.
abstract: The development of coupled perturbed mode theory--the combination of conventional coupled modes and perturbation theory for problems of sound speed range dependence--is extended using a transformation of the normal modes to include a range-dependent penetrable bottom. The result is a fast, direct, and accurate range-dependent modal solution of the acoustic field in the water column. The method is applied to upslope propagation in shallow water wedge waveguides.
authors.affiliation: Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand. cjh@phy.auckland.ac.nz
authors.forename: C J
authors.initials: CJ
authors.lastname: Higham
authors.forename: C T
authors.initials: CT
authors.lastname: Tindle