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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a262977.pdf


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
      Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE