Modelling noise in an urban intersection (A case study: Qazvin)

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Eskandari Reza; Rassafi Amir Abbas; Behnood Hamid Reza

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Journal Paper

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Journal: Modares Civil Engineering journal Year:2020 | Volume:20 | Issue:3 Page(s): 69-78

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Title

Modelling noise in an urban intersection (A case study: Qazvin)

Author(s)

Eskandari Reza | Rassafi Amir Abbas | Behnood Hamid Reza

Keywords

Sound level meter

Noise index

Weighted network

Sound pressure

Modeling of noise pollution

Abstract

Recent advances in technology of all disciplines bring some disadvantages, such as environmental problems just to name one among many. Environmental consequences of modernization could appear in different forms but generally speaking they are categorized to five major classes of air pollution, water contamination, soil contamination, warming and noise pollution. There has been a significant increase in noise pollution from man-made sources over the past 100 years, which now doubles every 10 years. Therefore, a rigorous evaluation of problem, useful engineering approaches as well as a thoughtful and meticulous planning decisions to control noise pollution and its harmful effects is an essential agenda for each community. Noise pollution that is different from other types of pollution due to its source and emission characteristics. In urban areas, the engine and exhaust system of cars, light trucks, buses and motorcycles is an important source of noise pollution, that have major environmental impacts. Traffic noise pollution is the most important source of environmental noise pollution in cities. The main objective of the paper is to find the relationships between noise and traffic characteristics, and also to examine the impact of each one separately, so that we can find out the importance of each variable in noise pollution we will find suitable solutions to reduce the noise pollution. In this study, which was carried out at one of the important intersections of Qazvin, data including equivalent sound level, the volume of vehicles by type, traffic light timing at picked up time, distance from picked up point to intersection center, number of honks at the time of picked up which is heard, that data was estimated at 94 points, Points were located at 10 m distance on the edge of the street and If there was an open space, points were expanded, and there were two picked up for each point. The followings are some of the most important results of the modeling: Distance has a great effect on the amount of sound received. By increasing the distance from the center of the intersection, the amount of noise received and as a result, noise pollution is drastically reduced. Proximity of intracity bus terminal as well as being at the entrance of the city, the number of heavy and semi-heavy vehicles passing through this intersection has worsened the situation of noise level. The green phase timing of each approach, and the use of horn by some drivers in green time to inform the driver closer to the intersection is one of the effective factors in noise pollution. In a nutshell, the results of modeling showed that the most important variables affecting the sound equivalent level includes the volume of vehicles, especially heavy and semi-heavy vehicles (with the impacts of 0. 025, 0. 125, 0. 526, 0. 489 for cars, motors, semi-heavy vehicles and trucks, respectively, ) the green time of the approach 1 and the number horns honked in this period (with the impact of 0. 05 dB per second, and. 08 dB per honk, respectively), are the variables that influence the equivalent sound level at this intersection. For improvement of the intersection in terms of noise level, the intersection schedule can be changed in favor of the passage of heavy vehicles and buses, which of course requires the presentation and implementation of accurate planning of buses and heavy vehicles. It is also possible to provide traffic restrictions for the passage of heavy and semi-heavy vehicles during the day or during peak hours, as well as restrictions for motorcycle traffic in urban areas depending on the type of vehicle and its pollution standards.

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APA: Copy

Eskandari, Reza, Rassafi, Amir Abbas, & Behnood, Hamid Reza. (2020). Modelling noise in an urban intersection (A case study: Qazvin). MODARES CIVIL ENGINEERING JOURNAL, 20(3 ), 69-78. SID. https://sid.ir/paper/1037403/en

Vancouver: Copy

Eskandari Reza, Rassafi Amir Abbas, Behnood Hamid Reza. Modelling noise in an urban intersection (A case study: Qazvin). MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2020;20(3 ):69-78. Available from: https://sid.ir/paper/1037403/en

IEEE: Copy

Reza Eskandari, Amir Abbas Rassafi, and Hamid Reza Behnood, “Modelling noise in an urban intersection (A case study: Qazvin),” MODARES CIVIL ENGINEERING JOURNAL, vol. 20, no. 3 , pp. 69–78, 2020, [Online]. Available: https://sid.ir/paper/1037403/en

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