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Investigating biophysical linkages at tidal energy candidate sites: a case study for combining environmental assessment and resource characterisation
journal contributionposted on 2023-05-20, 23:00 authored by Scherelis, C, Irene PenesisIrene Penesis, Hemer, MA, Cossu, R, Jeffrey WrightJeffrey Wright, Damien GuihenDamien Guihen
As the tidal energy industry looks to expand into commercial-scale array installations, uncertainty in methodology and outcome for environmental impact assessments can encumber tidal energy developments. Incorporating environmental monitoring measures into site characterisation campaigns can provide baseline information about biophysical relationships and help recognise potential impacts to the marine environment early in the development process. Concurrent measurements of fish and tidal currents were taken at a tidal energy candidate site in Australia over ∼2.5 months during its tidal resource assessment. Fish aggregation metrics (density, abundance, centre-of-mass (CM), dispersion, %-water column occupied, evenness, and relative aggregation) were investigated for their relation to environmental conditions (current speed, shear, temperature, diel stage, and tidal stage). Diel stage was the most significant indicator for fish density, abundance, and %-water column occupied. Fish density and abundance were elevated during strong currents, with vertical fish distribution (CM and dispersion) also influenced by current speed. Environmental conditions were able to explain up to 25% of variation in fish aggregation metrics using linear models. This study shows that early-stage environmental monitoring can successfully provide baseline information about fish aggregation responses to prevailing environmental conditions, thus reducing uncertainty risks for stakeholders of tidal energy developments.
Publication titleRenewable Energy
Department/SchoolAustralian Maritime College
PublisherPergamon-Elsevier Science Ltd
Place of publicationThe Boulevard, Langford Lane, Kidlington, Oxford, England, Ox5 1Gb
Rights statement© 2020 Elsevier Ltd. All rights reserved.
Socio-economic ObjectivesEnvironmentally sustainable energy activities not elsewhere classified; Tidal energy