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Long-term quantification and characterisation of wind farm noise amplitude modulation 

Author:  | Noise

[Abstract] The large-scale expansion of wind farms has prompted community debate regarding adverse impacts of wind farm noise (WFN). One of the most annoying and potentially sleep disturbing components of WFN is amplitude modulation (AM). Here we quantified and characterised AM over one year using acoustical and meteorological data measured at three locations near three wind farms. We found that the diurnal variation of outdoor AM prevalence was substantial, whereby the nighttime prevalence was approximately 2 to 5 times higher than the daytime prevalence. On average, indoor AM occurred during the nighttime from 1.1 to 1.7 times less often than outdoor AM, but the indoor AM depth was higher than that measured outdoors. We observed an association between AM prevalence and sunset and sunrise. AM occurred more often during downwind and crosswind conditions. These findings provide important insights into long term WFN characteristics that will help to inform future WFN assessment guidelines.

Phuc D. Nguyen, Kristy L. Hansen, College of Science and Engineering, Flinders University, Australia
Peter Catcheside, Branko Zajamsek, Adelaide Institute for Sleep Health, Flinders University
Colin H. Hansen, School of Mechanical Engineering, University of Adelaide

Measurement, Volume 182, September 2021, 109678
doi: 10.1016/j.measurement.2021.109678

Download original document: “Long-term quantification and characterisation of wind farm noise amplitude modulation

This material is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

The copyright of this material resides with the author(s). As part of its noncommercial educational 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. Queries e-mail.

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