Acoustic life cycle assessment of offshore renewables—Implications from a wave-energy converter deployment in Falmouth Bay, UK

Philippe Blondel, Jodi Walsh, Jo Garrett, P. R. Thies, Brendan J Godley, Matthew Witt, L. Johanning

Research output: Contribution to conferenceAbstract

Abstract

Marine Renewable Energy is developing fast, with hundreds of prototypes and operational devices worldwide. Two main challenges are assessing their environmental impacts (especially in near-shore, shallow environments) and ensuring efficient and effective maintenance (requiring specialised ships and fair weather windows), compounded by the lack of long-term measurements of full-scale devices. We present here broadband measurements (10 Hz to 32/48 kHz) acquired at the Falmouth Bay Test site (FaBTest, UK) from 2010 onwards, for a 16-m ring-shaped Wave Energy Converter, in waters up to 45 m deep. This period covers baseline measurements, including shipping from the neighbouring English Channel, one of the busiest shipping lanes in the world (ca. 45,000 ship transits annually) and the full period of installation and energy production, including maintenance episodes. Acoustic signatures are measured as Sound Pressure Levels (e.g. for impacts) and time/frequency variations (for condition-based monitoring via Acoustic Emissions). They change through time, depending on weather and modes of operation. Long-term measurements are compared with modelling of potential variations in this complex environment and with laboratory experiments. These are used to outline the varying acoustic contributions through the life cycle of a typical wave energy converter, yielding insights for other wave devices in other environments.
Original languageEnglish
Pages3923 - 3293
Number of pages1
DOIs
Publication statusPublished - Jun 2017
Event173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum: Acoustics'17 Boston - Boston, Boston, USA United States
Duration: 25 Jun 201729 Jun 2017
http://acousticalsociety.org/content/acoustics-17-boston

Conference

Conference173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum
Abbreviated titleAcoustics'17
CountryUSA United States
CityBoston
Period25/06/1729/06/17
Internet address

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Keywords

  • acoustic waves
  • underwater acoustics
  • Ambient Noise
  • acoustic emissions
  • environmental impacts
  • marine vessels
  • sound pressure
  • life cycle assessment

Cite this

Blondel, P., Walsh, J., Garrett, J., Thies, P. R., Godley, B. J., Witt, M., & Johanning, L. (2017). Acoustic life cycle assessment of offshore renewables—Implications from a wave-energy converter deployment in Falmouth Bay, UK. 3923 - 3293. Abstract from 173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum, Boston, USA United States. https://doi.org/10.1121/1.4988867