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Hydrokinetic Turbine Effects on Fish Swimming Behaviour

Linus Hammar (Institutionen för energi och miljö, Miljösystemanalys) ; Sandra Andersson ; Linda Eggertsen ; Johan Haglund ; Martin Gullström ; Jimmy Ehnberg (Institutionen för energi och miljö, Elteknik) ; Sverker Molander (Institutionen för energi och miljö, Miljösystemanalys)
PLoS ONE (1932-6203). Vol. 8 (2013), 12, p. artikel nr e84141.
[Artikel, refereegranskad vetenskaplig]

Hydrokinetic turbines, targeting the kinetic energy of fast-flowing currents, are under development with some turbines already deployed at ocean sites around the world. It remains virtually unknown as to how these technologies affect fish, and rotor collisions have been postulated as a major concern. In this study the effects of a vertical axis hydrokinetic rotor with rotational speeds up to 70 rpm were tested on the swimming patterns of naturally occurring fish in a subtropical tidal channel. Fish movements were recorded with and without the rotor in place. Results showed that no fish collided with the rotor and only a few specimens passed through rotor blades. Overall, fish reduced their movements through the area when the rotor was present. This deterrent effect on fish increased with current speed. Fish that passed the rotor avoided the near-field, about 0.3 m from the rotor for benthic reef fish. Large predatory fish were particularly cautious of the rotor and never moved closer than 1.7 m in current speeds above 0.6 ms-1. The effects of the rotor differed among taxa and feeding guilds and it is suggested that fish boldness and body shape influenced responses. In conclusion, the tested hydrokinetic turbine rotor proved non-hazardous to fish during the investigated conditions. However, the results indicate that arrays comprising multiple turbines may restrict fish movements, particularly for large species, with possible effects on habitat connectivity if migration routes are exploited. Arrays of the investigated turbine type and comparable systems should therefore be designed with gaps of several metres width to allow large fish to pass through. In combination with further research the insights from this study can be used for guiding the design of hydrokinetic turbine arrays where needed, so preventing ecological impacts.

Nyckelord: Tidal power, hydrokinetic turbine, fish, Mozambique, environmental impact, underwater video



Denna post skapades 2013-12-18. Senast ändrad 2014-09-02.
CPL Pubid: 189881

 

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