Accession Number : ADA313437

Title :   Effects of Shallow Water Bottom Interface Roughness and Volume Fluctuations on Broadband Pulse Resolution.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Yuan, Mei-Chun

PDF Url : ADA313437

Report Date : JUN 1996

Pagination or Media Count : 68

Abstract : Typical acoustic propagation in shallow water environments is dominated by bottom-interacting paths. The effects of rough bottom interfaces and sediment volume fluctuations are investigated using model simulations. A numerical study of low-frequency (approx. 2OO Hz) broadband pulse propagation is presented and several characterizations of bottom factors are examined. In particular, the variations of the interface rms roughness and a volume fluctuation strength constant on the time resolution of the broadband pulse are investigated. It is shown that interface roughness is the dominant factor in the degradation of pulse resolution.

Descriptors :   *ACOUSTIC WAVES, *SHALLOW WATER, *WAVE PROPAGATION, *UNDERWATER ACOUSTICS, MATHEMATICAL MODELS, ALGORITHMS, TIME DEPENDENCE, RESOLUTION, SURFACE ROUGHNESS, ANGLE OF ARRIVAL, THESES, BACKSCATTERING, BROADBAND, SOUND TRANSMISSION, ACOUSTIC ATTENUATION, ACOUSTIC SCATTERING, REVERBERATION, ACOUSTIC VELOCITY, OCEAN MODELS, OCEAN BOTTOM TOPOGRAPHY, SEDIMENTS, LOW FREQUENCY, TRANSMISSION LOSS, UNDERWATER SOUND SIGNALS, SOUND RANGING.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE