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Marine Acoustic Zones of Australia

Authors :
Joshua N. Smith
Renee P. Schoeman
Christine Erbe
David Peel
Source :
Journal of Marine Science and Engineering, Vol 9, Iss 340, p 340 (2021), Journal of Marine Science and Engineering, Volume 9, Issue 3
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

Underwater sound is modelled and mapped for purposes ranging from localised environmental impact assessments of individual offshore developments to large-scale marine spatial planning. As the area to be modelled increases, so does the computational effort. The effort is more easily handled if broken down into smaller regions that could be modelled separately and their results merged. The goal of our study was to split the Australian maritime Exclusive Economic Zone (EEZ) into a set of smaller acoustic zones, whereby each zone is characterised by a set of environmental parameters that vary more across than within zones. The environmental parameters chosen reflect the hydroacoustic (e.g., water column sound speed profile), geoacoustic (e.g., sound speeds and absorption coefficients for compressional and shear waves), and bathymetric (i.e., seafloor depth and slope) parameters that directly affect the way in which sound propagates. We present a multivariate Gaussian mixture model, modified to handle input vectors (sound speed profiles) of variable length, and fitted by an expectation-maximization algorithm, that clustered the environmental parameters into 20 maritime acoustic zones corresponding to 28 geographically separated locations. Mean zone parameters and shape files are available for download. The zones may be used to map, for example, underwater sound from commercial shipping within the entire Australian EEZ.

Details

Language :
English
ISSN :
20771312
Volume :
9
Issue :
340
Database :
OpenAIRE
Journal :
Journal of Marine Science and Engineering
Accession number :
edsair.doi.dedup.....6a08444b4ec0d6e9cd20770b54193acc