ACOUSTIC PHASE FLUCTUATIONS CAUSED BY GARRETT-MUNK INTERNAL WAVES

Authors
  1. Hughes, B.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Perturbed acoustic propagation is considered between a point source and an array receiver in which the perturbations are due to a Garrett-Munk internal wave field. The resultant acoustic phase fluctuations along the array are determined. Straight ray propagation is assumed, and three array orientations are considered: broadside horizontal, endfire horizontal and broadside vertical. It is shown that for an acoustic frequency of 150 Hz, a range of 50 km and a horizontal broadside receiver separation distance (in the array) of 1 km, the rms phase difference between the two receivers at 1000 m depth in the N. Pacific is typically 5 degrees, and in the Arctic it is typically 2 degrees, whereas in the N. Atlantic at the same depth it is typically 50 degrees. These geographical variations are due mainly to variations in the potential sound velocity gradient.
Report Number
TM-79-1 —
Date of publication
15 Mar 1979
Number of Pages
34
DSTKIM No
79-02164
CANDIS No
86512
Format(s):
Originator's fiche received by DSIS;Hardcopy

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