Steven Benjamins Presentations

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

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Steven Benjamins Presentations

  1. 1. Surveying for marine mammals in tidal streams Problems and possible solutions Steven Benjamins, Ben Wilson, Jim Elliott, Russell Leaper, Jonathan Gordon
  2. 2. 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
  3. 3. Problems monitoring in tidal streamsAt high current speeds:– Porpoises are even less visible– Increased ambient noise may mask calls
  4. 4. Porpoises with tide (flood) Porpoises with tide (ebb) Porpoises station to bottom6 knots over the ground (GPS)
  5. 5. 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
  6. 6. 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!
  7. 7. We thank: Cally Fleming, Robert Batty Silurian Skippers: Dave Hannah & John Hill Observers and crew esp. Nic Davies, Lucia Lopez & Nienke van GeelFunding from:

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