Accession Number : ADA263726

Title :   Acoustics of Bubbly Sediments.

Descriptive Note : Final rept.,

Corporate Author : TEXAS UNIV AT AUSTIN

Personal Author(s) : Bedford, A. ; Hawkins, J. A.

Report Date : 01 APR 1993

Pagination or Media Count : 118

Abstract : The generation and detection of sound in the ocean is important in military applications, in biological research, and in the geoacoustic profiling of the ocean bottom and the underlying sediments. Although the free propagation of sound through seawater is an important area of underwater acoustics, the interaction of sound waves with the sea floor frequently must be accounted for. In particular, using remote acoustic measurements to obtain seismic profiles of the ocean bottom depend on a good understanding of the reflection of sound from the water-sediment interface and the sound absorption characteristics of the sediment below the interface. A simple model for the sediment is a compressible fluid. The reflection coefficient can then be calculated from the impedance of the fluid. This simple model can be improved by including viscosity in the model.

Descriptors :   *UNDERWATER ACOUSTICS, *OCEAN BOTTOM, *ACOUSTIC WAVES, *SEISMIC SIGNATURES, *SEDIMENTS, *BUBBLES, GEOACOUSTICS, ACOUSTIC VELOCITY, ACOUSTIC ATTENUATION, ACOUSTIC REFLECTION, MILITARY APPLICATIONS, VISCOSITY, KINETIC ENERGY, INTERFACES.

Subject Categories : Physical and Dynamic Oceanography
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE