Accession Number : ADA298821

Title :   Progress Report on Grant N00014-94-1-0201 (The Catholic University of America).

Descriptive Note : Progress rept. 1 Jan-31 Oct 94,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON DC

Personal Author(s) : Beran, Mark J.

PDF Url : ADA298821

Report Date : 09 NOV 1994

Pagination or Media Count : 5

Abstract : In previous work, a modal approach was used to study random volume scattering in a shallow channel. Here, we shall show how the effects of a rough channel surface may be included in the formulation. To include the effects of the rough surface, the modes are taken to be dependent on the range and transverse coordinates in addition to the depth coordinate. The propagation is studied in terms of the ensemble averaged two point coherence function and the equation governing the coherence function is derived. The general method for volume scattering is given in detail in the above reference. Here it is shown how the surface scattering terms may be treated in this approach. The two point coherence function is expressed as the sum over both self modal and cross modal coherence functions. The difference between the self modal coherence functions and the cross modal coherence functions is discussed. A numerical example is given using typical shallow water parameters.

Descriptors :   *ACOUSTIC SCATTERING, *CHANNELS(WATERWAYS), *ACOUSTIC CHANNELS, PARAMETERS, COHERENCE, SURFACE ROUGHNESS, SURFACES, SHALLOW WATER, TRANSVERSE, SHALLOW DEPTH.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE