Acoustic life cycle assessment of offshore renewables – implications from a Wave-Energy Converter deployment in Falmouth Bay, UK

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

Research output: Contribution to conferencePaper

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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
Pages821-828
Number of pages8
Publication statusPublished - 11 Sep 2017
EventUnderwater Acoustics Conference and Exhibition - Skiathos, Greece
Duration: 3 Sep 20178 Sep 2017

Conference

ConferenceUnderwater Acoustics Conference and Exhibition
CountryGreece
CitySkiathos
Period3/09/178/09/17

Keywords

  • Life Cycle Assessment
  • Acoustic Emission
  • Marine Renewable Energy
  • Wave Energy Converter
  • Condition Monitoring

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering

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