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Noise pollution

About: Noise pollution is a research topic. Over the lifetime, 4455 publications have been published within this topic receiving 67192 citations.


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Journal ArticleDOI
30 Aug 2017-PLOS ONE
TL;DR: Test the effect of two intensities of traffic noise on calling males of two Neotropical treefrogs species to provide evidence that traffic noise affects anuran calling behavior, and noise intensity is an important factor affecting how species respond.
Abstract: Anthropogenic disturbance has been pointed to as one of the major causes of the world´s biodiversity crisis. Among them, noise pollution is a potential underestimated threat, projected to increase in the next decades accompanying urban expansion. Rising levels of noise pollution may result in negative impacts on species highly dependent on acoustic communication. Amphibians have long served as model organisms for investigating animal acoustic communication because their reproduction depends on transmitting and receiving acoustic signals. A few studies have investigated the effects of anthropogenic noise on anurans, but there is still limited knowledge on how it affects them. In this study, we test the effect of two intensities of traffic noise on calling males of two Neotropical treefrogs species. We expect to record more changes in call parameters, to avoid masking effect, at higher intensity noise treatments, and in the species with higher call/noise frequency overlap. We performed a set of field playback experiments exposing male frogs to road noise at two different intensities (65dB and 75dB). Focal species are Boana bischoffi (high call/noise frequency overlap) and B. leptolineata (low call/noise frequency overlap). Both species changed acoustic parameters during or after the exposure to traffic noise. Advertisement call rate of B. bischoffi decreased during road noise, and dominant frequency decreased over time. Call length of B. leptolineata increased or decreased, depending on the order of noise intensity. We also observed spatial displacement in both species, which moved away from the noise source. Our results provide evidence that traffic noise affects anuran calling behavior, and noise intensity is an important factor affecting how species respond.

38 citations

Journal ArticleDOI
TL;DR: Large eddy simulation with an actuator line technique is employed for the flow modelling and the corresponding flow fields are used to simulate sound generation and propagation of a 5 MW wind turbine.
Abstract: The unsteady nature of wind turbine noise is a major reason for annoyance. The variation of far-field sound pressure levels is not only caused by the continuous change in wind turbine noise source levels but also by the unsteady flow field and the ground characteristics between the turbine and receiver. To take these phenomena into account, a consistent numerical technique that models the sound propagation from the source to receiver is developed. Large eddy simulation with an actuator line technique is employed for the flow modelling and the corresponding flow fields are used to simulate sound generation and propagation. The local blade relative velocity, angle of attack, and turbulence characteristics are input to the sound generation model. Time-dependent blade locations and the velocity between the noise source and receiver are considered within a quasi-3D propagation model. Long-range noise propagation of a 5 MW wind turbine is investigated. Sound pressure level time series evaluated at the source time are studied for varying wind speeds, surface roughness, and ground impedances within a 2000 m radius from the turbine.

38 citations

Journal Article
TL;DR: In this paper, the ambient air quality noise levels (AAQNL) at traffic junctions were 5 dBA or more than those prescribed by AAQNS for commercial zone and most of the values were found in the range of 80 +/- 10 dBA.
Abstract: Visakhapatnam is an industrial and sea port city located on the east coast of India. A hospital (RCD hospital), residential area (Lawson's Bay Colony), traffic zone (Jagadamba junction, Andhra Pradesh State Road Transport Corporation Complex junction and Seethammadhara junction) and industrial zone (Sea port) were chosen to monitor the noise levels. The observed noise level at RCD hospital was more than 10 dBA in any time. The background noise at Santhi Ashram was approximately 3dBA less at night time and 2dBA less at day time compared to ambient air quality noise standards (AAQNS) for silent zone. The ambient air quality noise levels (AAQNL) at traffic junctions were 5 dBA or more than those prescribed by AAQNS for commercial zone and most of the values were found in the range of 80 +/- 10 dBA, among which 75% values were found in the range of 110 +/- 10 dBA. AAQNL near port were found in the range of 5 to 10 dBA positive shifts on AAQNS due to conveyor operation. The AAQNL were alarming even in the absence of conveyor system, indicating the impact of vehicular traffic. Remedial measures were suggested separately for each situation.

38 citations

Journal ArticleDOI
TL;DR: In this article, the authors adopted a spatio-statistical approach to quantify and model associations between noise pollution levels and landscape metrics of land categories (built-up structures and urban green covers).

38 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023195
2022391
2021227
2020216
2019231
2018235