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Surveying for marine mammals in tidal streams - problems and possible solutions

Surveying for marine mammals in tidal streams - problems and possible solutions

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Steven Benjamins Presentations Steven Benjamins Presentations Presentation Transcript

  • Surveying for marine mammals in tidal streams Problems and possible solutions Steven Benjamins, Ben Wilson, Jim Elliott, Russell Leaper, Jonathan Gordon
  • Tidal-stream energy generation in ScotlandPotential for significant expansion(e.g. Sound of Islay test array)Potential risks to marine mammals(collision, habitat exclusion)Assessment of relative © Hammerfest Strømabundance and habitat use onsite-by-site basis
  • Problems monitoring in tidal streamsAt high current speeds:– Porpoises are even less visible– Increased ambient noise may mask calls
  • Porpoises with tide (flood) Porpoises with tide (ebb) Porpoises station to bottom6 knots over the ground (GPS)
  • A multi-element approach (1)Land-based visualobservations of particularareas (as appropriate)Visual observations fromsurvey vessel– Go with current, but at an angle– Repeat surveys through tidal 58° cycle
  • A multi-element approach (2)Passive acoustic monitoring:– Towed hydrophone array (spatial coverage)– Moored porpoise click detectors– (CPODs; temporal coverage)– Drifting hydrophones (to address water movement issue) © Chelonia Inc. © SAMSDifferent approaches provide a range of perspectives!
  • We thank: Cally Fleming, Robert Batty Silurian Skippers: Dave Hannah & John Hill Observers and crew esp. Nic Davies, Lucia Lopez & Nienke van GeelFunding from: