Vertical Coherence of the Shallow Water Ambient Noise Field, A Model

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Authors
  1. Desharnais, F.
  2. Chapman, D.M.F.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
A shallow water noise model is used to simulate the vertical coherence of an acoustic noise field due to sea surface noise. The coherence between two vertically separated sensors is calculated from the Fourier transform of the received noise intensity as a function of vertical arrival angle. The vertical noise directionality is derived from a uniform distribution of sources at the ocean surface, an energy flux propagation model and a plane-wave bottom reflection coefficient for a multi-layered elastic seabed. The propagation model allows for an arbitrary sound speed profile in the water column and incluses sea water absorption. This simple model clearly demonstrates the influence of seabed parameters, sound speed profile in the water, and noise source directivity on the vertical coherence of the noise field.
Keywords
Seabeds;Sea surface noise;Acoustic models;Ambient noise;Vertical coherence
Report Number
DREA-TM-1999-011 — Technical Memorandum
Date of publication
01 Feb 1999
Number of Pages
43
DSTKIM No
CA000357
CANDIS No
512413
Format(s):
Hardcopy;Document Image stored on Optical Disk

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