Field measurements of the environmental parameter and pollutant dispersion in urban undersea road tunnel

Wang, Mingnian; Wang, Xu; Yu, Li; Deng, Tao

doi:10.1016/j.buildenv.2018.11.036

Cited by 36 publications

(5 citation statements)

References 41 publications

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“…Most researches employing wind tunnel experiment (Kanda et al, 2006;Littera et al,2017), field measurement (Chen et al, 2002;Chow and Chan, 2003;Wang et al, 2019) and CFD simulation (Xue et al,2014;Yu et al, 2014;Liu et al, 2019) show that the tunnel instability and pollutant diffusion may be dominate by the speed of the vehicle, rather than its geometry and driveway model, as most vehicles are light duty vehicles with similar shape and an unidirectional lane per channel is common in urban road tunnel.…”

Section: Model Proceduresmentioning

confidence: 99%

Coagulation patterns and the impacts on traffic-related ultrafine particle dispersion in road tunnels employing dynamic mesh algorithms

Zhao

Yang

Song

et al. 2021

Environ Sci Pollut Res

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Following our simulation results in paper (Zhao et al., 2020). In this study we continue to analyze the diffusion mechanism of ultrafine particles and the particle coagulation phenomenon with the size range of 26~287 nm exhausted from the vehicles during the process of passing through a 100 m long tunnel using the Realizable k-ε model and the dynamic grid technique. In this paper, a three-dimensional model consisting of a 100 m highway tunnel and four sideby-side gasoline vehicles (L×W×H = 4.5 m×1.8 m×1.5 m) were established in the STAR-CCM+ computational fluid dynamics software. The gasoline vehicles travelled simultaneously under the different situations of three driving speeds of 60 km h -1 , 40 km h -1 and 20 km h -1 during the simulation. Through data analysis and research, it is found that the coagulation process of particles is very complicated, especially at low speeds. When the vehicle speed is 20 km h -1 , the variation of particle concentration at the vehicle wake near the tailpipe (at the vertical plane located 0.1 m behind the exhaust pipe) will cause a large error if the coagulation action is not taken into account. The relative error of the average particle concentration at 0.5 s of the vertical section 0.1m away from the exhaust pipe is as high as 193.51%. The relative error in the whole tunnel is only 2.82%, less than 5%, thus the influence of coagulation can be ignored for the whole tunnel. This study clarified the importance of coagulation in different areas and its influence on the diffusion of particulate matter, which is conducive to further analysis of the diffusion characteristics of particulate matter and can appreciably reduce the pollution degree in the tunnel by changing the coagulation efficiency of particulate matter in the future.

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Section: Model Proceduresmentioning

confidence: 99%

Coagulation patterns and the impacts on traffic-related ultrafine particle dispersion in road tunnels employing dynamic mesh algorithms

Zhao

Yang

Song

et al. 2021

Environ Sci Pollut Res

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“…For this reason, it is necessary to study the temporal variation of environmental parameters and air pollution distribution inside tunnel. Unfortunately, few researches focus on the above problems [2][3][4]. In this paper, the field measurement is carried out in a typical commuting tunnel during the evening rush hour.…”

Section: Introductionmentioning

confidence: 99%

Field measurement of thermal environment and air pollution level inside an urban road tunnel during the evening rush hour

Yang

Chen

et al. 2022

E3S Web Conf.

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Some urban road tunnels serve as the main traffic access routes for residents in the surrounding large communities. The traffic congestion is a common phenomenon during rush hours inside this kind of tunnel. In order to learn about the environmental parameters inside tunnel during the evening rush hour, a comprehensive measurement in a typical commuting tunnel is conducted. The thermal environment parameters and air pollutant distribution along the tunnel are measured simultaneously. The results show that the traffic volume, vehicle speed and air velocity inside tunnel take on the obvious temporal and spatial discrepancy. There are the average 4.58°C air temperature rise and 96μg/m3 PM2.5 concentration rise from the tunnel entrance to the tunnel exit. The PM2.5 concentration at the tunnel exit is about 2.67 times of the 24-hour average limit of Chinese standard. The rise gradients of the air temperature and PM 2.5 concentration during the evening rush hour is given out.

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“…Urban traffic tunnels, a primary form of developing and utilizing underground spaces, are essential for optimal land utilization, communication in key traffic nodes, and alleviation of traffic congestion on the ground [1]. Urban traffic tunnels also cause a variety of environmental problems, such as ambient air quality of some areas near the tunnel exceeding standards under the impact of exhaust gas from the tunnel and difficulty in harmonizing exhaust emissions and regional planning [2][3][4][5]. Currently, exhausting waste gas via upper vents on the top of tunnels is an efficient means to deal with the environmental impact of exhaust from urban traffic tunnels on the regional environment and has been more frequently applied in urban tunnels [6], such as the Hongxing Road Tunnel in Chengdu, the Zijingang Tunnel in Hangzhou, and the Taihu Avenue Tunnel in Wuxi, Jiangsu.…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact of Discharge Patterns and Ambient Wind on the Jet Discharge from a Mechanical Upper Vent of a Tunnel

Xin

Zhu

2021

Applied Sciences

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Flow characteristics and pollutant dispersion characteristics of a mechanical upper vent of a tunnel under various discharge patterns and ambient wind were studied by using the computational fluid dynamics (CFD) numerical method and an experimental model. On this basis, variations in the environmental impact radius rcriti changing with the ambient wind velocity U for pollutants from vertical and horizontal outlets were also analyzed with the set discharge capacity. According to our findings, the pollutant emission of the upper vent under a vertical discharge pattern can be considered as free buoyant jet diffusion under the impact of the momentum of ambient wind, while the emission under the horizontal discharge pattern can be regarded as semi-confined buoyant jet diffusion under the impact of the momentum of ambient wind. Moreover, the rcriti of the vertical outlet increased with the increase of U when U ≤ 3 m/s and was minimally affected by U for U > 3 m/s. Additionally, the rcriti of the horizontal outlet decreased with the increase of U. When the discharge capacity was constant, the rcriti of the upper vent under both vertical and horizontal discharge patterns declined with the increase of the discharge velocity V0. Note that the rcriti of the vertical outlet was smaller than that of the horizontal one for the range of parameters considered. These results can provide a theoretical reference for optimizing the design of a vent on the top of an urban tunnel.

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Field measurements of the environmental parameter and pollutant dispersion in urban undersea road tunnel

Cited by 36 publications

References 41 publications

Coagulation patterns and the impacts on traffic-related ultrafine particle dispersion in road tunnels employing dynamic mesh algorithms

Coagulation patterns and the impacts on traffic-related ultrafine particle dispersion in road tunnels employing dynamic mesh algorithms

Field measurement of thermal environment and air pollution level inside an urban road tunnel during the evening rush hour

Environmental Impact of Discharge Patterns and Ambient Wind on the Jet Discharge from a Mechanical Upper Vent of a Tunnel

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