Accession Number : ADA262977
Title : Shear Effects on Ocean Acoustic Propagation Due to Step-Periodic Roughness Along the Ocean Bottom Interface
Descriptive Note : Final rept.
Corporate Author : NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
Personal Author(s) : Chin-Bing, Stanley A ; Murphy, Joseph E
Report Date : Jan 1993
Pagination or Media Count : 8
Abstract : Low-frequency ocean acoustic propagation can be affected by backscatter from rough ocean bottoms and by compressional-shear wave conversions within the ocean bottom. Numerical simulations have been performed that include the effects of such backscattering and loss mechanisms. A full-wave range- dependent finite-element ocean seismo-acoustic computer model (SAFE) was used together with a simulated rough ocean bottom structure that supported compressional and shear wave speeds as well as compressional and shear wave attenuations. Step-periodic changes in depth and range along the water-bottom interface were used to simulate ocean-bottom roughness. A numerical example was used to illustrate the combined effects of ocean-bottom shear and roughness, and to give insight into these complicated processes.... Acoustic waves, Elastic waves, Seismic waves.
Descriptors : *PROPAGATION , *ACOUSTIC WAVES , *SEISMIC WAVES , VELOCITY , CONVERSION , MODELS , INTERFACES , BACKSCATTERING , ACOUSTICS , ELASTIC WAVES , OCEAN BOTTOM , LOW FREQUENCY , BOTTOM , ROUGHNESS , OCEANS , ATTENUATION , DEPTH , STRUCTURES , WATER , COMPUTERS , FREQUENCY , SIMULATION
Subject Categories : Seismology
Distribution Statement : APPROVED FOR PUBLIC RELEASE