Accession Number : ADA255700


Title :   Bottom Penetration at Shallow Grazing Angles II


Descriptive Note : Final rept. 31 Dec 1990-31 Dec 1991


Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS


Personal Author(s) : Boyle, Frank A ; Chotiros, Nicholas P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255700.pdf


Report Date : 19 Jun 1992


Pagination or Media Count : 54


Abstract : A study was made of acoustic propagation through sandy sediments. It was done in two parts. First an acoustic model for penetration based on the Biot model was considered. The model was used to predict phase velocities, attenuations, reflection coefficients, and pressure amplitudes in the sediment. Second, a preliminary model for acoustic backscatter from a distribution of gas bubbles was developed. The model involves a combination of existing theories for backscattering strengths from individual bubbles with a hypothetical bubble size distribution function which is related to the sediment rain size distribution.


Descriptors :   *BACKSCATTERING , *PENETRATION , *SEDIMENTS , *DISTRIBUTION FUNCTIONS , *ACOUSTICS , FUNCTIONS , PROPAGATION , REFLECTION , COEFFICIENTS , PRESSURE , AMPLITUDE , ATTENUATION , BUBBLES , RAIN , PHASE , MODELS , DISTRIBUTION


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE