Influence of microclimatic elements on sound propagation in Amazonian cities: The case of urban noise in Belem.

2021 ◽  
Vol 263 (1) ◽  
pp. 5708-5719
Author(s):  
Vânia Raposo de Moura dos Santos ◽  
Gustavo Melo
Keyword(s):  
Urban Environment ◽  
Atmospheric Pressure ◽  
Sound Propagation ◽  
Road Traffic ◽  
Meteorological Data ◽  
Traffic Noise ◽  
Road Traffic Noise ◽  
Urban Noise ◽  
Air Ventilation ◽  
Microclimatic Conditions

Many studies have shown that microclimatic elements influence the sound propagation in cities, and can contribute to increasing or decreasing the urban noise. This paper aims to discuss the relationship between main microclimatic elements - air temperature, air humidity, atmospheric pressure and winds - and the noise caused by road traffic in an Amazonian urban environment, in order to emphasize the importance of urban planning instruments be adapted to the specific microclimatic conditions, promoting the improvement of the urban environment from more efficient building strategies for controlling the sound pollution. For this, it's used as basis a theoretical framework on the topic, meteorological data from Brazil's National Institute of Meteorology and illustrative maps of the city of Belem. It was found that the temperature, humidity and atmospheric pressure, for this microclimate, do not collaborate for reducing road traffic noise, leaving this responsibility to the winds (air ventilation) and the way they behave within the built urban mass. KEYS Urban noise - Urban Microclimate - Amazonian environment

scholarly journals Combining VR Visualization and Sonification for Immersive Exploration of Urban Noise Standards

2019 ◽  
Vol 3 (2) ◽  
pp. 34 ◽  
Author(s):  
Markus Berger ◽  
Ralf Bill
Keyword(s):  
Real Time ◽  
Sound Propagation ◽  
Road Traffic ◽  
Expert Knowledge ◽  
Low Cost ◽  
Traffic Noise ◽  
Urban Traffic ◽  
Road Traffic Noise ◽  
Common Noise ◽  
Noise Assessment

Urban traffic noise situations are usually visualized as conventional 2D maps or 3D scenes. These representations are indispensable tools to inform decision makers and citizens about issues of health, safety, and quality of life but require expert knowledge in order to be properly understood and put into context. The subjectivity of how we perceive noise as well as the inaccuracies in common noise calculation standards are rarely represented. We present a virtual reality application that seeks to offer an audiovisual glimpse into the background workings of one of these standards, by employing a multisensory, immersive analytics approach that allows users to interactively explore and listen to an approximate rendering of the data in the same environment that the noise simulation occurs in. In order for this approach to be useful, it should manage complicated noise level calculations in a real time environment and run on commodity low-cost VR hardware. In a prototypical implementation, we utilized simple VR interactions common to current mobile VR headsets and combined them with techniques from data visualization and sonification to allow users to explore road traffic noise in an immersive real-time urban environment. The noise levels were calculated over CityGML LoD2 building geometries, in accordance with Common Noise Assessment Methods in Europe (CNOSSOS-EU) sound propagation methods.

Data Collection and Modeling Results to Permit Estimation of Meteorological Effects on Roadway Noise

2019 ◽  
Vol 2673 (11) ◽  
pp. 243-253
Author(s):  
Roger L. Wayson ◽  
Kenneth Kaliski ◽  
John M. MacDonald ◽  
Erik M. Salomons ◽  
Darlene D. Reiter
Keyword(s):  
United States ◽  
Data Collection ◽  
Road Traffic ◽  
Meteorological Data ◽  
Traffic Noise ◽  
The United States ◽  
Road Traffic Noise ◽  
Atmospheric Conditions ◽  
Noise Propagation ◽  
Meteorological Effects

The estimation of absolute road traffic noise levels without including the effects of meteorology is thought to be a major source of error in the estimation process commonly used in the United States. In response, the Transportation Research Board-sponsored NCHRP 25-52, Meteorological Effects on Roadway Noise, to collect highway noise data under different meteorological conditions, document the meteorological effects on roadway noise propagation under different atmospheric conditions, develop best practices, and provide guidance on how to (a) quantify meteorological effects on roadway noise propagation and (b) explain those effects to the public. The completed project involved collecting and analyzing 35,000 min of sound and meteorological data at 16 barrier and no-barrier measurement positions adjacent to Interstate 17 in Phoenix, Arizona. This report provides information on the data collection and the modeling recommendations. The database assembled is thought to be among the best available in the United States to permit analysis of meteorological effects on roadway noise. The study recommendations will advance the methodology for estimating the meteorological effects on roadway noise in the United States.

State-of-the-Art Prediction and Control of Road Traffic Noise in France

1998 ◽  
Vol 1626 (1) ◽  
pp. 71-77 ◽  
Author(s):  
Michel C. Bérengier ◽  
Fabienne Anfosso-Lédée
Keyword(s):  
Sound Propagation ◽  
Road Traffic ◽  
Numerical Models ◽  
Traffic Noise ◽  
Low Noise ◽  
Road Traffic Noise ◽  
Road Noise ◽  
The Road ◽  
Road Pavement ◽  
Prediction And Control

Because traffic noise is considered by the French population as the primary environmental nuisance, prediction of road traffic noise and development of efficient noise control techniques is very important. The first step is to analyze the source, the main part of which is due to the contact between tires and the road pavement. Many efforts have been devoted to the assessment of a reliable measurement method, and a classification of road pavements in relation to noise has been established for some years. To abate road traffic noise, special attention has been paid to low-noise pavements. Thus, the modeling of the absorption properties of porous asphalts has been particularly studied in the past 10 years. The second step is to understand the physics of sound propagation outdoors, especially the meteorological effects on the propagation of road traffic noise. Both theoretical and experimental approaches have been undertaken. Finally, the effect of road noise barriers of any shape on the propagation of road noise and their interaction with porous road surfaces have been investigated by using numerical models.

scholarly journals Noise Annoyance in Urban Life: The Citizen as a Key Point of the Directives

Proceedings ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 1 ◽  
Author(s):  
Alexandra Labairu-Trenchs ◽  
Rosa Alsina-Pagès ◽  
Ferran Orga ◽  
Maria Foraster
Keyword(s):  
Sensor Network ◽  
Road Traffic ◽  
Low Cost ◽  
Traffic Noise ◽  
Urban Life ◽  
Road Traffic Noise ◽  
Acoustic Sensor ◽  
Urban Noise ◽  
Selection Of

The improvement of the quality of life in the framework of the smart city paradigm cannot be limited to measuring objective environmental factors, but should also consider the assessment of the citizens’ health. Road traffic noise has been widely studied in terms of citizens’ annoyance and its impact on health, but other types of urban noise are usually outside of those analyses. Each node of a wireless acoustic sensor network can pick up street noise and can even record specific sounds that reach a higher equivalent level for study, but the most important thing for administration is whether certain types of noise annoy the citizen. In this work, we present the analysis and the selection of several audio samples collected by a wireless acoustic sensor network in an urban environment in order to conduct perceptive tests by several users. This a first approximation to the evaluation of the real perception of citizens’ annoyance with respect to the urban noise collected by a low-cost wireless acoustic sensor network.

scholarly journals MODELLING URBAN NOISE IN CITYGML ADE: CASE OF THE NETHERLANDS

2017 ◽  
Vol IV-4/W5 ◽  
pp. 73-81 ◽  
Author(s):  
K. Kumar ◽  
H. Ledoux ◽  
T. J. F. Commandeur ◽  
J. E. Stoter
Keyword(s):  
Urban Areas ◽  
Input Data ◽  
Road Traffic ◽  
Traffic Noise ◽  
Environmental Noise ◽  
Motor Vehicles ◽  
Road Traffic Noise ◽  
Noise Levels ◽  
Noise Mapping ◽  
Urban Noise

Road traffic and industrial noise has become a major source of discomfort and annoyance among the residents in urban areas. More than 44 % of the EU population is regularly exposed to road traffic noise levels over 55 dB, which is currently the maximum accepted value prescribed by the Environmental Noise Directive for road traffic noise. With continuously increasing population and number of motor vehicles and industries, it is very unlikely to hope for noise levels to diminish in the near future. Therefore, it is necessary to monitor urban noise, so as to make mitigation plans and to deal with its adverse effects. The 2002/49/EC Environmental Noise Directive aims to determine the exposure of an individual to environmental noise through noise mapping. One of the most important steps in noise mapping is the creation of input data for simulation. At present, it is done semi-automatically (and sometimes even manually) by different companies in different ways and is very time consuming and can lead to errors in the data. In this paper, we present our approach for automatically creating input data for noise simulations. Secondly, we focus on using 3D city models for presenting the results of simulation for the noise arising from road traffic and industrial activities in urban areas. We implemented a few noise modelling standards for industrial and road traffic noise in CityGML by extending the existing Noise ADE with new objects and attributes. This research is a steping stone in the direction of standardising the input and output data for noise studies and for reconstructing the 3D data accordingly.

Environmentally Progressive Road Traffic Noise Reducing Devices and Materials

2016 ◽  
Vol 832 ◽  
pp. 144-151
Author(s):  
Martin Decky ◽  
Matúš Kováč ◽  
Eva Remišová
Keyword(s):  
Sustainable Development ◽  
Sound Propagation ◽  
Road Traffic ◽  
Traffic Noise ◽  
Noise Pollution ◽  
Scientific Paper ◽  
Road Traffic Noise ◽  
Reference Framework ◽  
Specific Objective

This paper analyses issues of progressive road traffic noise reducing devices design and evaluating the quality of asphalt road surfaces from the perspective of the Permanent Sustainable Development, which is one of the horizontal priorities of the National Strategic Reference Framework for the period from 2007 to 2013. The horizontal priority (HP) Permanent Sustainable Development (PSD) of the National Strategic Reference Framework (NSRF) has been complementary affecting the objectives of the NSRF. The purpose of the HP is to ensure targeted achievement on several priorities of the NSRF, which cannot be provided by a single Operational Program (OP), but requires a coordinated approach combining several specific priorities / priority axes / actions, or more precisely the projects of particular OPs. Within the specific objective of enhancing the quality of the environment has been directly defined sub-goal - to reduce noise pollution of environment. The scientific paper is concerned with measurements of the noise production and sound propagation on four different roads, where the source of the noise was the same vehicle driving at five different speeds.

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