Scattering and Propagation of Acoustic Waves in the Presence of Rough, Penetrable Boundaries
Final rept. 1 Apr 1970-31 Mar 1971
TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
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In this report, the reflection and scattering models and the propagation model including the effects of realistic ocean boundaries are further developed. A brief introduction which includes a short history of the scattering and propagation work performed at Applied Research Laboratories ARL , and the considerations which motivated the research represented in this report are given. The theoretical foundations of the scattering by acoustically penetrable surfaces are presented. The formulas developed are used to investigate the effects of various realistic ocean bottoms on the performance of bottom bounce sonars. Once the effect of a known bottom on the signal can be predicted, the problem of predicting the physical properties of the bottom from the signals it returns becomes manageable. Certain relevant aspects of this problem are discussed, specifically, the prediction of the forward reflected signal from measurements of the backscattered signal. Propagation in a surface duct with realistic boundaries is treated, and the attenuation per mode due to boundary roughness is calculated for the Epstein model. Finally, the preliminary work on the experimental measurements of the scattering by acoustically penetrable, rough surfaces is presented.
- Physical and Dynamic Oceanography
- Acoustic Detection and Detectors