As the boundaries of harvesting wind energy expand to meet the ever-increasing societal energy demands, the number and size of wind turbines being constructed rises. As part of a larger project to monitor sound in an operating wind park in western New York State, a cross-sectional survey was conducted among individuals living in and around the wind park to characterize the perception, level of annoyance, and self-reported health effects of residents. We conducted the study in a 126 MW wind park consisting of 84 turbines spanning approximately 19 square miles of farmland. Short-term outdoor and indoor sound level measurements were also performed at each dwelling in which a questionnaire was administered. To our knowledge, this study is the first to collect sound measurements at individual residences. There was no apparent exposure-response relationship between an individual's level of annoyance and the short duration sound measurements collected at the time of the survey. There was a correlation between an individual's concern regarding health effects and the prevalence of sleep disturbance and stress among the study population. The siting process is unique to each community with varying degrees of success. Additional sound level measurements inside and outside homes in larger cohorts in concert with detailed questionnaires would be useful in verifying those exposure-response relationships found in studies using calculated sound level data. Additional research should include a detailed investigation of sleep patterns and possible disturbance in those living in and near operating wind turbine projects.
Noise from wind turbines is of concern in the planning process of newwind farms, and accurate estimations of immission noise levels at residents nearby are required. Sound propagation from wind turbine to receivercould be modelled by as implified standard model assuming constant meteorological conditions, by an engineering method taking atmospheric and ground propagation conditions into account, or by amore exact model. Epidemiological studies have found ahigher frequencyofannoyance due to wind turbine noise than to other community noise sources at equal noise levels, indicating that the often used simplified model is not sufficient. This paper evaluates the variation of immission sound levels under the influence of meteorological variation and explores if the prediction of levels could be improvedbytaking the effect of wind speed on sound propagation into account. Long-term sound recordings and measurements at ad istance of 530 mf rom aw ind turbine showt hat the simplified standard model predicts the average sound pressure levels satisfactorily under downwind conditions, and that amore complexpropagation model might not be needed for wind turbine noise at arelatively short distance. Large variations of sound immission levels at the same wind speed were howeverp resent. Statistical analysis revealed that these variations were influenced by meteorological parameters, such as temperature, static pressure and deviation from ideal downwind direction. The overall results indicate that meteorological factors influence the noise generated by the wind turbine rather than the sound propagation. PACS no. 43.28.-g, 43.50.x, 43.58.e ACTA ACUSTICA UNITED WITH ACUSTICA Forssén et al.:W ind turbine noise propagation over flat ground Vol. 96 (2010)
Excess attenuation for sound propagation over an urban canyonThis document has been downloaded from Chalmers Publication Library (CPL). It is the author´s version of a work that was accepted for publication in: Applied Acoustics (ISSN: 0003-682X) Citation for the published paper: Schiff, M. ; Hornikx, M. ; Forssén, J. (2010) "Excess attenuation for sound propagation over an urban canyon". Abstract: Because quiet areas in dense urban environments are important to well-being, the prediction of sound propagation to shielded areas is an ongoing research focus. Sound levels in shielded areas (such as canyons between rows of buildings) are strongly influenced by distant sources, so propagation factors such as metrology, screening, and intermediate canyons (occurring between a source canyon and a receiver canyon) must therefore be addressed in an engineering propagation model. Though current models address many important propagation factors, engineering treatment of a closed urban canyon (subject to multiple internal reflections) remains difficult. A numerical investigation of sound propagation across the open tops of intermediate urban canyons has been performed, using the parabolic equation and equivalent sources methods. Results have been collected for various canyon geometries, and the influence of multiple canyons, canyon/rooftop absorption, variable rooftop height, wind gradient, and correlated versus uncorrelated source models have been investigated. Resulting wideband excess attenuation values ranged from -1 to -4 dB per canyon, and were fairly constant with frequency in many useful cases. By characterizing the excess attenuation of canyons intermediate to the source and receiver, the influence of these intermediate canyons could be addressed simply, without the overhead of a detailed numerical calculation.
This work explores how escalating New York City rent and noise dissatisfaction may interrelate, and whether pre-pandemic trends held up during 2020 and beyond. Are there parts of town that combine affordable rent and low noise complaint rates? Can past complaints and housing trends predict when and where noise complaints are most likely, and does this hold up in a city on lockdown? Using eleven years of New York City “311” hotline noise complaint records (over three million individual complaints) and combining these with neighborhood rent statistics, comparisons can be made on a local level. A positive correlation is apparent between monthly median rent and monthly noise complaint rate in every borough and sub-district in the city. Whether this is causal or inflationary coincidence is uncertain, and massively increased complaint rates during lockdown defy past trends.
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