Acoustic Propagation Modeling for ANGEL

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Authors
  1. Pecknold, S.P.
  2. Tollefsen, C.D.S.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN)
Abstract
The overall goal of the Audibility of Naval Gunfire Exercises on Land (ANGEL) project was to determine whether naval gunfire exercises would have an impact on bird colonies, nesting areas, or other sensitive sites on land in close proximity to naval operational areas by combining results from a literature review, field measurements of ambient noise and acoustic transmission loss over a water surface, and acoustic propagation model results. Given the difficulty in making measurements of sound levels caused by gunfire over a wide range of environmental conditions, an acoustic propagation modelling component was needed for the ANGEL project. Defence Research and Development Canada’s (DRDC’s) established underwater acoustic propagation model, PECan, was modified for atmospheric acoustic propagation calculations by implementing the ability to handle wind, a rough ocean surface, isotropic or anisotropic turbulence, and by activating a 3D calculation capability through the use of an azimuthal coupling operator. The mathematics underlying the model extension is explained, sample model results are presented, and the new PECan input file format is specified.

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Keywords
air acoustics propagation modelling;parabolic equation model
Report Number
DRDC-RDDC-2015-R144 — Scientific Report
Date of publication
01 Jul 2015
Number of Pages
50
DSTKIM No
CA041576
CANDIS No
802773
Format(s):
Electronic Document(PDF)

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