Abstract
The theory of coupled modes with elastic waves from the bottom sediments of a shallow oceanic environment is developed for a source at the water column. The shear and compressional attenuation coefficients have been included as a first- and second-order perturbation to the solution of the purely real eigenequation. Results of these calculations display the importance of the second-order perturbation calculation when radiating modes are included in the transmission loss calculations or when shear waves are included. The perturbed eigenvalues and eigenfunctions were used by an already developed coupled normal-mode computer code to provide the transmission loss in a range-dependent, shallow-ocean environment [Miller et al., J. Acoust. Soc. Am. 79, 562–565 (1986)]. The results obtained are compared to the ones by Miller et al. for upslope and downslope environments. [Work supported in part by the Individual Research Board at the Naval Surface Warfare Cener and by NORDA.]
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