Thursday, March 19, 2009

Wind turbine noise and wildlife

"Impacts of turbine noise on wildlife are essentially unknown. Mechanical noise from turbines is minimal, dissipates rapidly with increasing distance from the source, and is unlikely to impact wildlife behavior. Aerodynamic noise, which varies with the ratio of blade tip speed to wind speed, can be transmitted over considerable distances; sound waves from multiple turbines can combine to amplify the sound in the area of intersection (so noise is greater at a distance from the turbines than along the turbine string itself); and sound waves can bounce off neighboring mountains in unpredictable ways, increasing noise levels in unpredictable locations. The potential for interference with predator-prey relationships and vocal communication of birds during courtship and breeding indicate a need for additional investigation at existing wind energy facilities before this project moves forward."

--Audubon Society of New Hampshire, Feb. 27, 2009, letter to Site Evaluation Committee concerning proposed wind turbines in northern N.H.

wind power, wind energy, wind turbines, wind farms, environment, environmentalism, animal rights