Normal Mode FORTRAN Programs for Calculating Sound Propagation in the Ocean.
Abstract
Two related normal mode computer programs which can be used to calculate the sound field produced in the ocean by a point source are described. The programs are written in FORTRAN for use with the Control Data Corporation 3800 computer system. The ocean environment is modeled as a constant depth layer of water (first layer) bounded above by a pressure release surface and below by a bottom consisting of a constant depth fluid layer (second layer) and a semi-infinite layer (third layer). The two programs differ in that the third layer is taken to be a fluid in one (PROGRAM FLUID) and a solid in the other (PROGRAM SOLID). The sound speed profiles in the first and second layers can be arbitrary functions of depth, however, they and the other environmental parameters must be independent of range. The depth-dependent differential equation which results from the separation of the wave equation is solved numerically for the eigenfunctions, which are the normal modes of the system. Bottom attenuation and surface and bottom scattering loss are included as perturbations. The programs also provide, as a separate option, the calculation of the group velocities of the modes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA013256
Entities
People
- Frank Ingenito
- John F. Miller
Organizations
- United States Naval Research Laboratory