Wind Turbine Sound in Cold Climates
The increase in the number of wind turbines (WTs) in populated areas in cold climates increases the number of people potentially being affected by WT sound. Outdoor sound propagation is strongly dependent on meteorological conditions, however, limitations in the knowledge exist regarding the implica...
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Uppsala universitet, Luft-, vatten- och landskapslära
2019
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ftuppsalauniv:oai:DiVA.org:uu-379554 2023-05-15T17:45:01+02:00 Wind Turbine Sound in Cold Climates Conrady, Kristina 2019 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379554 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Uppsala Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 1784 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379554 urn:isbn:978-91-513-0601-8 info:eu-repo/semantics/openAccess atmospheric acoustics wind turbine sound outdoor sound propagation cold climates Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2019 ftuppsalauniv 2023-02-23T21:52:13Z The increase in the number of wind turbines (WTs) in populated areas in cold climates increases the number of people potentially being affected by WT sound. Outdoor sound propagation is strongly dependent on meteorological conditions, however, limitations in the knowledge exist regarding the implications of meteorological conditions in cold climates. Long-term acoustic and meteorological measurements were conducted in the vicinity of two wind farms in northern Sweden, to investigate the effect of snow and low-level wind maxima on WT sound, to analyse the occurrence of amplitude modulation and to evaluate selection methods for WT sound measurements. Different selection methodologies were applied to the acoustical data. The simplest method only includes a minimum rotational frequency of the WTs, while the most comprehensive method additionally includes criteria based on spectral resemblance, temporal variation of the sound level, amplitude modulation and wind speed. The effect of snow on WT sound depends on the snow quality. Snow on trees lowers the sound level by ca. 2 dBA. Low-level wind maxima below hub height reduce the sound level near the surface. Since this effect is increasing with increasing strength of the low-level wind maximum, the WT sound is assumed to be partly trapped above the low-level wind maximum. Amplitude modulation was shown to be dependent on atmospheric stability and was most common for very stable conditions. Moreover, a clear difference between the occurrences of amplitude modulation for the two crosswind sectors was observed. The choice of selection method needs to be taken into account when comparing different studies since it affects the results and conclusions. The studies emphasise to include the effects of individual meteorological conditions of a site in the formulation of guidelines on WT sound. Doctoral or Postdoctoral Thesis Northern Sweden Uppsala University: Publications (DiVA) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
atmospheric acoustics wind turbine sound outdoor sound propagation cold climates Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
spellingShingle |
atmospheric acoustics wind turbine sound outdoor sound propagation cold climates Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Conrady, Kristina Wind Turbine Sound in Cold Climates |
topic_facet |
atmospheric acoustics wind turbine sound outdoor sound propagation cold climates Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
description |
The increase in the number of wind turbines (WTs) in populated areas in cold climates increases the number of people potentially being affected by WT sound. Outdoor sound propagation is strongly dependent on meteorological conditions, however, limitations in the knowledge exist regarding the implications of meteorological conditions in cold climates. Long-term acoustic and meteorological measurements were conducted in the vicinity of two wind farms in northern Sweden, to investigate the effect of snow and low-level wind maxima on WT sound, to analyse the occurrence of amplitude modulation and to evaluate selection methods for WT sound measurements. Different selection methodologies were applied to the acoustical data. The simplest method only includes a minimum rotational frequency of the WTs, while the most comprehensive method additionally includes criteria based on spectral resemblance, temporal variation of the sound level, amplitude modulation and wind speed. The effect of snow on WT sound depends on the snow quality. Snow on trees lowers the sound level by ca. 2 dBA. Low-level wind maxima below hub height reduce the sound level near the surface. Since this effect is increasing with increasing strength of the low-level wind maximum, the WT sound is assumed to be partly trapped above the low-level wind maximum. Amplitude modulation was shown to be dependent on atmospheric stability and was most common for very stable conditions. Moreover, a clear difference between the occurrences of amplitude modulation for the two crosswind sectors was observed. The choice of selection method needs to be taken into account when comparing different studies since it affects the results and conclusions. The studies emphasise to include the effects of individual meteorological conditions of a site in the formulation of guidelines on WT sound. |
format |
Doctoral or Postdoctoral Thesis |
author |
Conrady, Kristina |
author_facet |
Conrady, Kristina |
author_sort |
Conrady, Kristina |
title |
Wind Turbine Sound in Cold Climates |
title_short |
Wind Turbine Sound in Cold Climates |
title_full |
Wind Turbine Sound in Cold Climates |
title_fullStr |
Wind Turbine Sound in Cold Climates |
title_full_unstemmed |
Wind Turbine Sound in Cold Climates |
title_sort |
wind turbine sound in cold climates |
publisher |
Uppsala universitet, Luft-, vatten- och landskapslära |
publishDate |
2019 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379554 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 1784 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-379554 urn:isbn:978-91-513-0601-8 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766147723338186752 |