Abstract:
A model is presented for bistatic scattering into ocean sediments from an acoustic source located in the water to a receiver buried in the bottom. The model is closely related to that developed previously for a source and receiver that were both located in the water. The model is an applied effort that incorporates the results of more fundamental work that has tested the validity of some components of the model. Bottom scattering is treated as being due to interface roughness and volume inhomogeneity. Kirchhoff theory is used to explain interface scattering near the refracted (Snell's law) direction, and perturbation theory is used for all other directions. Perturbation theory is also used to treat the scattering due to volume inhomogeneities. Model results are presented for two bottom types. It is shown that it predicts subcritical penetration into sediments with sound speeds greater than that of water. [Work sponsored by Office of Naval Research.]