The Problems With ‘Noise Numbers’ for Wind Farm Noise Assessment

Bob Thorne, Bulletin of Science Technology & Society 2011 31: 262, DOI: 10.1177/0270467611412557

Bio
Bob Thorne, MSc, PhD, is the principal consultant of Noise Measurement Services Pty Ltd, Brisbane, Australia. He holds a PhD from Massey University, New Zealand, in health science and is an environmental health research associate in the Institute of Food, Nutrition and Human Health at Massey University. His research work involves using advanced specialized technology for intrusive noise assessment, and a specific application is personalized sound reinforcement for hearing assistive devices.

Abstract
Human perception responds primarily to sound character rather than sound level. Wind farms are unique sound sources and exhibit special audible and inaudible characteristics that can be described as modulating sound or as a tonal complex. Wind farm compliance measures based on a specified noise number alone will fail to address problems with noise nuisance. The character of wind farm sound, noise emissions from wind farms, noise prediction at residences, and systemic failures in assessment processes are examined. Human perception of wind farm sound is compared with noise assessment measures and complaint histories.

The adverse effects on health of persons susceptible to noise from wind farms are examined and a hypothesis, the concept of heightened noise zones (pressure variations), as a marker for cause and effect is advanced. A sound level of LAeq 32 dB outside a residence and above an individual’s threshold of hearing inside the home are identified as markers for serious adverse health effects affecting susceptible individuals.

The article is referenced to the author’s research, measurements, and observations at different wind farms in New Zealand and Victoria, Australia.

Download: The Problems With ‘Noise Numbers’ for Wind Farm Noise Assessment (PDF)

Original Source: http://nieuwerustnoisewatch.org/wp-content/documents/peer-reviewed-articles/01-swv_symposium_paper_thorne_problems_with_noise_numbers.pdf