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Installation and operational effects of a HVDC submarine cable in a continental shelf setting: Bass Strait, Australia

Sherwood, John, Chidgey, Scott, Crockett, Peter, Gwyther, David, Ho, Percival, Stewart, Simon, Strong, David, Whitely, Bob and Williams, Alan 2016, Installation and operational effects of a HVDC submarine cable in a continental shelf setting: Bass Strait, Australia, Journal of ocean engineering and science, vol. 1, no. 4, pp. 337-353, doi: 10.1016/j.joes.2016.10.001.

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Title Installation and operational effects of a HVDC submarine cable in a continental shelf setting: Bass Strait, Australia
Author(s) Sherwood, John
Chidgey, Scott
Crockett, Peter
Gwyther, David
Ho, Percival
Stewart, Simon
Strong, David
Whitely, Bob
Williams, Alan
Journal name Journal of ocean engineering and science
Volume number 1
Issue number 4
Start page 337
End page 353
Total pages 17
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-12
ISSN 2468-0133
Keyword(s) high voltage direct current
power cable
magnetic field
epibenthos
ecological effects
video survey
Summary Despite the many submarine telecommunications and power cables laid world-wide there are fewer than ten published studies of theirenvironmental effects in the refereed literature. This paper describes an investigation into the effects of laying and operating the BasslinkHigh Voltage Direct Current (HVDC) cable and its associated metallic return cable across Bass Strait in South East Australia. Over morethan 95% of its length the cable was directly laid into a wet jetted trench given the predominantly soft sediments encountered. Underwaterremote video investigations found that within two years all visible evidence of the cable and trench was gone at over a third of the transectsat six deep water sites (32–72 m deep). At other deep water transects the residual trench trapped drift material providing habitat for thegenerally sparsely distributed benthic community. Diver surveys at both of the near shore sites (<15 m deep) on the northern side of theStrait also found the cable route was undetectable after a year. On the southern side, where the cable traversed hard basalt rock near shore,it was encased in a protective cast iron half shell. Ecological studies by divers over 3.5 years demonstrated the colonization of the hard shellby similar species occupying hard substrates elsewhere on the basalt reef. Magnetic field strengths associated with the operating cable werefound to be within 0.8% of those predicted from theory with strength dropping rapidly with distance from the cable. Beyond 20 m the fieldwas indistinguishable from background.
Language eng
DOI 10.1016/j.joes.2016.10.001
Field of Research 050204 Environmental Impact Assessment
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Shanghai Jiaotong University
Free to Read? Yes
Use Rights Creative Commons Attribution Non-Commercial No-Derivatives licence
Persistent URL http://hdl.handle.net/10536/DRO/DU:30093964

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.