Computer Modeling of Direct Path, Backscattered Bottom Reverberations for the Acoustic Reverberation Special Research Program (ARSRP)
1990
Kalra, A. K.
The Bottom/Subbottom Special Research Project of the Acoustic Reverberation Special Research Program (ARSRP) is planning to collect, and later interpret the low-frequency (50-500 Hz), low-grazing angle (+ or - 15 deg) backscattered bottom/subbottom reverberation data in the Atlantic natural laboratory. Although the specific location of the nature laboratory has not been decided, it will be located between the Bermuda Rise and the Mid-Atlantic Ridge (MAR). We have modeled the quasi-monostatic, bottom surface reverberation responses for different bathymetric profiles, within the above mentioned general area of the Atlantic natural laboratory, in order to facilitate the design of the reverberation experiment planned in FY93. The study of the reverberation field for the ARSRP objectives has been divided into three distinct ranges: long, intermediate, and short. The intermediate scale is set at a range of approximately 1/2 of a convergence zone distance. The long ranges are of the order of 1000 km, and the short range is close enough to the scattering region (5x5 km squared) to study the scattering process as close to its source as possible. The short range studies correspond to the direct or pure pure path reverberations. The direct path defines the propagation paths that preclude interaction with the sea surface and minimize the effect of bulk variability with in the water column. The modeled reverberation studies described here are for the short range situations. Consequently, the bottom reverberations are simulated for the sensors located close to the reverberation patch (5x5 km area) .
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