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- W4245717662 abstract "This paper considers an effective depth approximation for an ocean waveguide with a bottom in which a sediment layer overlies a hard rock basement. The primary application of this approximation is to the calculation of three-dimensional propagation over sloping bottoms. It is shown that at low frequencies the resonances in the sediment layer cause the effective depth to oscillate rapidly. At high frequencies, when the attenuation in the sediment layer becomes significant, the effective depth tends to zero and the acoustic propagation is dependent on the modal attenuation. This can be incorporated into the effective depth theory by allowing the effective depth to be a complex number, defined in terms of the impedance of the water/sediment interface. Comparison with exact calculations shows that the effective depth approach gives a good approximation for the lower-order modes, but does not include the effects of the higher-order modes which are shown to make a significant contribution to the fine scale structure of the long range transmission loss. [Work supported by ONR.]" @default.
- W4245717662 created "2022-05-12" @default.
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- W4245717662 date "1992-04-01" @default.
- W4245717662 modified "2023-09-24" @default.
- W4245717662 title "The effective depth approximation for sound propagation in shallow water over a sediment layer and a hard rock basement." @default.
- W4245717662 doi "https://doi.org/10.1121/1.403238" @default.
- W4245717662 hasPublicationYear "1992" @default.
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