A TWO-ENDED SHOOTING TECHNIQUE FOR CALCULATING NORMAL MODES IN UNDERWATER ACOUSTIC PROPAGATION

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Authors
  1. Ellis, D.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
An algorithm for the calculation of acoustic normal modes in the ocean is described. The algorithm is valid for an arbitrary sound speed and density profile in the water column and bottom. Losses due to volume absorption in the water and bottom, surface and bottom roughness, and shear waves in the bottommost layer can be calculated as perturbations. The essential feature of the algorithm is a two-ended shooting method in which the trial solution is started separately at the surface and bottom and numerically integrated to a matching depth in the middle, usually near the minimum sound speed. The trial solution is interated until a continuous function with a continuous derivative is obtained. Shooting from both ends results in a more stable algorithm and gives more accurate eigenfunctions than are obtained using conventional single-ended shooting methods.
Report Number
DREA-R-85-105 —
Date of publication
15 Sep 1985
Number of Pages
45
DSTKIM No
85-03731
CANDIS No
48490
Format(s):
Hardcopy;Originator's fiche received by DSIS;Document Image stored on Optical Disk

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