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Unless indicated otherwise, documents presented here are not the product of nor are they necessarily endorsed by National Wind Watch. These resource documents are shared here to assist anyone wishing to research the issue of industrial wind power and the impacts of its development. The information should be evaluated by each reader to come to their own conclusions about the many areas of debate. • The copyrights reside with the sources indicated. As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations.


Date added:  September 15, 2020
Health, Noise, SwedenPrint storyE-mail story

A laboratory study on the effects of wind turbine noise on sleep: results of the polysomnographic WiTNES study

Author:  Smith, Michael; Ögren, Mikael; Thorsson, Pontus; Hussain-Alkhateeb, Laith; Pedersen, Eja; Forssén, Jens; Ageborg Morsing, Julia; and Persson Waye, Kerstin

Abstract
Study Objectives: Assess the physiologic and self-reported effects of wind turbine noise (WTN) on sleep.
Methods: Laboratory sleep study (n = 50 participants: n = 24 living close to wind turbines and n = 26 as a reference group) using polysomnography, electrocardiography, salivary cortisol, and questionnaire endpoints. Three consecutive nights (23:00–07:00): one habituation followed by a randomized quiet Control and an intervention night with synthesized 32 dB LAEq WTN. Noise in WTN nights simulated closed and ajar windows and low and high amplitude modulation depth.
Results: There was a longer rapid eye movement (REM) sleep latency (+16.8 min) and lower amount of REM sleep (−11.1 min, −2.2%) in WTN nights. Other measures of objective sleep did not differ significantly between nights, including key indicators of sleep disturbance (sleep efficiency: Control 86.6%, WTN 84.2%; wakefulness after sleep onset: Control 45.2 min, WTN 52.3 min; awakenings: Control n = 11.4, WTN n = 11.5) or the cortisol awakening response. Self-reported sleep was consistently rated as worse following WTN nights, and individuals living close to wind turbines had worse self-reported sleep in both the Control and WTN nights than the reference group.
Conclusions: Amplitude-modulated continuous WTN may impact on self-assessed and some aspects of physiologic sleep. Future studies are needed to generalize these findings outside of the laboratory and should include more exposure nights and further examine possible habituation or sensitization.

Michael G. Smith, Mikael Ögren, Pontus Thorsson, Laith Hussain-Alkhateeb, Eja Pedersen, Jens Forssén, Julia Ageborg Morsing and Kerstin Persson Waye

Department of Occupational and Environmental Medicine, School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg; Division of Applied Acoustics, Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg; Akustikverkstan, Lidköping; and Department of Architecture and the Built Environment, Lund University, Lund, Sweden

Sleep, Volume 43, Issue 9, 1 September 2020, zsaa046, doi:10.1093/sleep/zsaa046

Download original document: “A laboratory study on the effects of wind turbine noise on sleep: results of the polysomnographic WiTNES study

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Date added:  September 8, 2020
WildlifePrint storyE-mail story

Assessing the effect of wind farms in fauna with a mathematical model

Author:  Refoyo Román, Pablo; Olmedo Salinas, Cristina; and Muñoz Araújo, Benito

[Abstract]
Energy production by wind turbines has many advantages. The wind is a renewable energy that does not emit greenhouse gases and has caused a considerable increase in wind farms around the world. However, this type of energy is not completely free of impact. In particular, wind turbines displace and kill a wide variety of wild species what forces us to plan their location well. In any case, the determination of the effects of wind farms on fauna, especially the flying one, is difficult to determine and depends on several factors. In this work, we will try to establish a mathematical algorithm that allows us to combine all variables that affect the species with the idea of quantifying the effect that can be caused by the installation of a wind farm with certain characteristics in a given place. We have considered specific parameters of wind farms, the most relevant environmental characteristics related to the location of the wind farm, and morphological, ethological, and legal characteristics in the species. Two types of assessment are established for the definitive valuation: Total Assessment and Weighted Assessment. Total Valuation is established based on a reference scale that will allow us to establish categories of affection for the different species while Weighted Valuation allows us to establish which species are most affected.

Figure 1. Factors influencing mortality of species by wind farms. The potential negative effects of wind farms depend not only on the characteristics of them (design and spatial distribution of the turbines) but also on the orography of the land, the present species (abundance of the species and also of their prey, their behaviour and their flight characteristics and socioeconomic, demographic aspects (Wing Goodale and Stenhouse).

Figure 2. Relationships of variables affecting species mortality. It is necessary to consider the possible relationships between the different variables. Probably, the potential effects of the described wind farms could increase their effects or be mutually exclusive (Marques et al.).

Pablo Refoyo Román, Cristina Olmedo Salinas, and Benito Muñoz Araújo
Biodiversity, Ecology & Evolution Department, Biological Sciences Faculty, Complutense University of Madrid, Spain

Scientific Reports (2020) 10:14785

Download original document: “Assessing-effect-wind-farms-fauna

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Date added:  August 23, 2020
Switzerland, WildlifePrint storyE-mail story

Bird collisions at wind turbines in a mountainous area related to bird movement intensities measured by radar

Author:  Aschwanden, Janine; et al.

Abstract

Bird collisions at wind turbines are perceived to be an important conservation issue. To determine mitigation actions such as temporary shutdown of wind turbines when bird movement intensities are high, knowledge of the relationship between the number of birds crossing an area and the number of collisions is essential. Our aim was to combine radar data on bird movement intensities with collision data from a systematic carcass search.

We used a dedicated bird radar, located near a wind farm in a mountainous area, to continuously record bird movement intensities from February to mid-November 2015. In addition, we searched the ground below three wind turbines (Enercon E-82) for carcasses on 85 dates and considered three established correction factors to extrapolate the number of collisions.

The extrapolated number of collisions was 20.7 birds/wind turbine (CI-95%: 14.3–29.6) for 8.5 months. Nocturnally migrating passerines, especially kinglets (Regulus spp.), represented 55% of the fatalities. 2.1% of the birds theoretically exposed to a collision (measured by radar at the height of the wind turbines) were effectively colliding.

Collisions mainly occurred during migration and affected primarily nocturnal migrants. It was not possible to assign the fatalities doubtlessly to events with strong migration. Fresh-looking carcasses were found after nights with both strong and weak bird movement intensities, indicating fatalities are not restricted to mass movement events (onshore). Rather, it is likely that an important factor influencing collision risk is limited visibility due to weather conditions. Local and regional visibility should be considered in future studies and when fine-tuning shutdown systems for wind turbines.

Janine Aschwanden, Herbert Stark, Dieter Peter, Thomas Steuri, Baptiste Schmid, Felix Liechti
Swiss Ornithological Institute, Switzerland

Biological Conservation
Volume 220, April 2018, Pages 228-236
doi: 10.1016/j.biocon.2018.01.005

Bird collisions at wind turbines in a mountainous area related to bird movement intensities measured by radar

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Date added:  August 6, 2020
Contracts, South DakotaPrint storyE-mail story

Easement for Wind Energy Development: Triple H Wind Project

Author:  Infinity Power Partners

Download original document: “Easement for Wind Energy Development: Triple H Wind Project

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