II. PRESSURE PUISE PROPAGATION FBOM AN UNDERWATER EXPLOSION IN THE VXCIUm OF A SLOPING BOTTOM

Various problems concerning the effects of the boundaries of the ocean on the propagation of pressure waves In the ocean are considered. The propagation of a transient pressure wave In a wedge shaped region of fluid Is treated. This Is the model chosen to describe the situation In which an underwater explosion takes place In a coastal ocean region which Is characterized by a strongly sloping bottom. In an attempt to study the effects of the polar Ice cap on the propagation of a pressure wave, the reflection of a plane wave onto a rough boundary separating a fluid half space and a thick fluid layer of differing sound speed and density Is consldered. These results are currently being used to construct the response to a transient pressure pulse and to generate numerical results for conditions representative of underwater explosions. The final section presents numerical values of the reflection coefficient as a function of grazing angle for the case of a plane wave Incident on a porous elastic bottom. The analytical expressions used were derived In an earlier report of this series.