Accession Number : ADA150235


Title :   The Effects of Internal Waves on Acoustic Normal Modes.


Descriptive Note : Technical rept.,


Corporate Author : TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS


Personal Author(s) : Penland,M C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a150235.pdf


Report Date : Dec 1984


Pagination or Media Count : 151


Abstract : In describing the effects of internal waves on acoustic normal modes excited by a time-harmonic point source, all previous descriptions have neglected the existence of azimuthal fluctuations in the acoustic field. This study compares this azimuthally symmetric case with the case where azimuthal fluctuations in the acoustic field are taken into account. Although azimuthal variations enhance the randomization of interference effects so that different depth modes decorrelate more quickly in range, this enhancement is generally small. This mean energy flux vector (j) becomes radial at long ranges; the vertical components of (j) decay somewhat more quickly with range when azimuthal fluctuations are considered than when they are neglected. (Author)


Descriptors :   *ACOUSTIC FIELDS , *INTERNAL WAVES , MATHEMATICAL MODELS , SOURCES , HARMONICS , ENERGY TRANSFER , DEPTH , TIME , VARIATIONS , INTERFERENCE , AZIMUTH , UNDERWATER ACOUSTICS


Subject Categories : Acoustics


Distribution Statement : APPROVED FOR PUBLIC RELEASE