ANALYTICAL STUDY OF CERTAIN ASPECTS OF UNDERWATER SHOCKWAVE PROPAGATION: SLOPING BOTTOM, ICECAP, SEDIMENTARY BOTTOM

• Main Authors: Feit, David, Thompson, Jr, William
• Other Authors: CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA
• Format: Text
• Language: English
• Published: 1966
• Subjects: Physical and Dynamic Oceanography; Explosions; *SHOCK WAVES; *UNDERWATER EXPLOSIONS; BOUNDARY LAYER; ICE; OCEAN BOTTOM TOPOGRAPHY; PRESSURE; PROPAGATION; SCATTERING; SEDIMENTATION; Ice cap; Polar Ice Cap
• Online Access: http://www.dtic.mil/docs/citations/AD0644197; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0644197

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 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 considered. 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.