Accession Number : ADA312639

Title :   Modeling of the Acoustic Propagation in Shallow Water Oceanic Regions.

Descriptive Note : Final technical rept. 15 Mar 94-15 Sep 95,

Corporate Author : RHODE ISLAND UNIV KINGSTON DEPT OF OCEAN ENGINEERING

Personal Author(s) : Grilli, Stephan T. ; Stepanishen, Peter R.

PDF Url : ADA312639

Report Date : 08 FEB 1996

Pagination or Media Count : 9

Abstract : The long term goal of this work is to develop a numerical model for studying acoustic propagation in range and depth dependent shallow water environments, with inclusion of bottom effects. In this project, simplified two dimensional models, both analytical and numerical, were developed to study the effect of complex (rigid) bottom topography on the acoustic propagation in an otherwise homogeneous water column. In both cases, a Boundary Integral Equation approach was used. Matching was specified along interface boundaries between the solution in the interior region, with irregular topography, and exterior constant depth radiation regions. Eigenfunction expansions of the solution were used in radiation region. Results were obtained for simple obstacles in an otherwise flat bottom (steps, rectangular obstacles, plus plane slopes and wedges). Using an impedance transfer matrix, the method can also solve problems for an arbitrary combination of steps and wedges.

Descriptors :   *SOUND TRANSMISSION, *UNDERWATER ACOUSTICS, MATHEMATICAL MODELS, INTERFACES, TWO DIMENSIONAL, TOPOGRAPHY, BOUNDARIES, SHALLOW WATER, INTEGRAL EQUATIONS, HOMOGENEITY, UNDERWATER SOUND SIGNALS.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE