Acoustic Propagation in Random Oceans Using the Transport Equation.
Abstract
The use of the transport equation for calculating acoustic propagation in a medium where rough surface and volume scattering effects are important has been investigated. The results of the study indicate that, for the surface duct considered, and at 1030 Hz, the below-duct ensonification can be ascribed to two effects. The first of these is scattering by a rough surface. No detailed surface roughness measurements were made during the acoustic propagation experiments that the calculations were compared with, but the study showed that even a very small swell component could account for much of the energy scattered below the duct. There was some ambiguity in exactly how to describe the surface roughness. A sawtooth model is used to account for both shadowing and multiple scatter. Preliminary comparisons of this model with a more realistic sinusoidal model suggest that little difference in the propagation results would have been observed had the sinusoidal model actually been used in the calculations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 18, 1978
- Accession Number
- ADA057128
Entities
People
- F. D. Tappert
- H. L. Wilson