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- W2034506544 abstract "Low-frequency reverberation from range-dependent ocean bottoms can be very complex. As in the case of high-frequency reverberation, the impedance contrast between water and ocean bottom is a major determinant in the reverberation. However, unlike the high-frequency reverberation case, the low-frequency acoustic field incident on the ocean-bottom interface can be both scattered from and propagated through the interface into the ocean bottom and subbottom. Additionally, the compressional wave incident from the fluid (water) media can be partially converted to Scholte waves along the interface and shear waves within the ocean bottom. These conversions appear as increased attenuation, thereby reducing the backscattered field. The converted interface and shear waves can also radiate back into the water column, thus adding to the background reverberant field. Simulation modeling of low-frequency reverberation from range-dependent ocean bottoms should include these complex coupled processes. This has been attempted here using the cw range-dependent seismo-acoustic finite-element model, SAFE, coupled to a parabolic equation model. Isolation of the backscattered field (and its components) was accomplished by subtracting selected components from the total two-way full-wave coupled field. Examples will be presented of backscatter simulation from rough penetrable ocean bottoms that include interface waves and shear conversions. [Work supported by ONR/NOARL and by the ONR Acoustic Reverberation SRP.]" @default.
- W2034506544 created "2016-06-24" @default.
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- W2034506544 date "1991-10-01" @default.
- W2034506544 modified "2023-10-18" @default.
- W2034506544 title "Low‐frequency reverberation simulations from range‐dependent shear‐supporting ocean bottoms." @default.
- W2034506544 doi "https://doi.org/10.1121/1.401153" @default.
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