Who Should be Afraid of a Tidal Turbine - The Good the Bad or the Ugly?

Conference Paper

Title: Who Should be Afraid of a Tidal Turbine - The Good the Bad or the Ugly?
Publication Date:
September 05, 2013
Conference Name: 10th European Wave and Tidal Energy Conference
Conference Location: Aalborg, Denmark
Technology Type:

Document Access

Attachment: Access File
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Hammar, L.; Ehnberg, J. (2013). Who Should be Afraid of a Tidal Turbine - The Good the Bad or the Ugly?. Paper Presented at the 10th European Wave and Tidal Energy Conference, Aalborg, Denmark.

Advances in tidal power development indicate that many coastal straits and bends with rapid currents will be equipped with in-stream turbines in the future. Considering the variety among turbine designs it is reasonable to assume both large and small rotors will be utilized. Each design implies a different way of interfering with local environment. However, there are very few available reports on fish behaviour in the presence of in-stream turbines. In this paper fish swimming behaviour is investigated in relation to the risk of colliding with different tidal turbine rotors. Based on an existing model and Monte-Carlo simulations with biological data from a field survey the blade-strike probability is calculated for three different and widespread fish taxa (damselfishes, requiem sharks, and barracudas). The results indicate that small turbines carry higher risks, as long as fish are assumed not to detect and actively avoid the rotor. However, the following paper indicates that improvements to the model may alter these results. Furthermore, it is shown that the potential hazard of tidal turbines varies strongly between different fish taxa and individuals. And seemingly it is ‘the bad’ that has the most reasons to be afraid.

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