http://www.ninapierpont.com/?s=practice&p=5http://www.windturbinesyndrome.com/I frequently cite articles from Wikipedia, but I'm under no illusions about it.
I agree that there's a lot of nonsense spread about wind turbines (say, have you heard they kill birds?) But I'm not going to simply gainsay any statement regarding possible health effects due to the noise they make.
http://oem.bmj.com/cgi/content/abstract/64/7/480 Published Online First: 1 March 2007. doi:10.1136/oem.2006.031039
Occupational and Environmental Medicine 2007;64:480-486
Copyright © 2007 by the BMJ Publishing Group Ltd.
ORIGINAL ARTICLE
Wind turbine noise, annoyance and self-reported health and well-being in different living environments
Eja Pedersen and Kerstin Persson Waye
Occupational and Environmental Medicine, Sahlgrenska Academy, Göteborg University, Göteborg, Sweden
Correspondence to:
Mrs E Pedersen
Occupational and Environmental Medicine, Sahlgrenska Academy, Göteborg University, PO Box 414, SE-405 30 Göteborg, Sweden;
[email protected]Objectives: To evaluate the prevalence of perception and annoyance due to wind turbine noise among people living near the turbines, and to study relations between noise and perception/annoyance, with focus on differences between living environments.
Methods: A cross-sectional study was carried out in seven areas in Sweden across dissimilar terrain and different degrees of urbanisation. A postal questionnaire regarding living conditions including response to wind turbine noise was completed by 754 subjects. Outdoor A-weighted sound pressure levels (SPLs) were calculated for each respondent. Perception and annoyance due to wind turbine noise in relation to SPLs was analysed with regard to dissimilarities between the areas.
Results: The odds of perceiving wind turbine noise increased with increasing SPL (OR 1.3; 95% CI 1.25 to 1.40). The odds of being annoyed by wind turbine noise also increased with increasing SPLs (OR 1.1; 95% CI 1.01 to 1.25). Perception and annoyance were associated with terrain and urbanisation: (1) a rural area increased the risk of perception and annoyance in comparison with a suburban area; and (2) in a rural setting, complex ground (hilly or rocky terrain) increased the risk compared with flat ground. Annoyance was associated with both objective and subjective factors of wind turbine visibility, and was further associated with lowered sleep quality and negative emotions.
Conclusion: There is a need to take the unique environment into account when planning a new wind farm so that adverse health effects are avoided. The influence of area-related factors should also be considered in future community noise research.
Abbreviations: LSD, least significant difference; SPL, sound pressure level
http://www3.interscience.wiley.com/journal/120084200/abstract?CRETRY=1&SRETRY=0 Wind turbines, flicker, and photosensitive epilepsy: Characterizing the flashing that may precipitate seizures and optimizing guidelines to prevent them
*Graham Harding, *Pamela Harding, and †Arnold Wilkins
*Neurosciences Institute Aston University, Birmingham, United Kingdom ; and †Department of Psychology, University of Essex, Colchester, United Kingdom
Address correspondence to Professor Graham Harding, The ElectroDiagnostic Centre Ltd, Greenfields, Upton Snodsbury, Worcester WR7 4NR, U.K. E-mail:
[email protected]Copyright © 2008 by the International League Against Epilepsy
KEYWORDS
Photosensitive epilepsy • Flicker • Rotors • Visual discomfort • Wind farms • Wind turbines • Green power
ABSTRACT
Wind turbines are known to produce shadow flicker by interruption of sunlight by the turbine blades. Known parameters of the seizure provoking effect of flicker, i.e., contrast, frequency, mark-space ratio, retinal area stimulated and percentage of visual cortex involved were applied to wind turbine features. The proportion of patients affected by viewing wind turbines expressed as distance in multiples of the hub height of the turbine showed that seizure risk does not decrease significantly until the distance exceeds 100 times the hub height.
Since risk does not diminish with viewing distance, flash frequency is therefore the critical factor and should be kept to a maximum of three per second, i.e., sixty revolutions per minute for a three-bladed turbine. On wind farms the shadows cast by one turbine on another should not be viewable by the public if the cumulative flash rate exceeds three per second. Turbine blades should not be reflective.
Accepted February 1, 2008; Online Early publication April 4, 2008.
DIGITAL OBJECT IDENTIFIER (DOI)
10.1111/j.1528-1167.2008.01563.x About DOI