scholarly journals Urban Obstacles Influence on Street Canyon Ventilation: A Brief Review

2021 ◽  
Vol 8 (1) ◽  
pp. 11
Author(s):  
Riccardo Buccolieri ◽  
Oliver Savio Carlo ◽  
Esther Rivas ◽  
Jose Luis Santiago
Keyword(s):  
Air Quality ◽  
Street Canyon ◽  
Building Design ◽  
Short Paper ◽  
Future Research ◽  
Urban Street Canyon ◽  
New Developments ◽  
Urban Street ◽  
Design Flexibility ◽  
Porous Barriers

Many research articles explore new designs and how to arrange barriers/obstacles to improve roadside air quality and ventilation within the urban street canyon. These obstacles are generally categorized into porous, non-porous and mixed type. Porous barriers include vegetated shrubs and trees; non-porous barriers include parked cars, low boundary walls, etc., while mixed barriers combine both porous and non-porous barriers. Moreover, new developments can benefit from added design flexibility using lift-up building design and building porosity as a promising way of improving ventilation. This short paper reviews the different research studies conducted on obstacles/barriers in an urban canyon which helps improve air quality and also highlights potential future research.

Impact of traffic volume and composition on the air quality and pedestrian exposure in urban street canyon

2014 ◽  
Vol 98 ◽  
pp. 260-270 ◽  
Author(s):  
Agata Rakowska ◽  
Ka Chun Wong ◽  
Thomas Townsend ◽  
Ka Lok Chan ◽  
Dane Westerdahl ◽  
...  
Keyword(s):  
Air Quality ◽  
Street Canyon ◽  
Traffic Volume ◽  
Urban Street Canyon ◽  
Urban Street

scholarly journals AERODYNAMIC EFFECTS OF POLLUTION CONCENTRATIONS IN URBAN STREET CANYON USING TWO PASSIVE CONTROL METHODS: CROSSING UNDER BUILDING AND LOW BOUNDARY WALL

2019 ◽  
pp. 13-22
Author(s):  
Faddia Baghlad ◽  
Benouada Douaiba ◽  
Abbes Azzi
Keyword(s):  
Air Quality ◽  
Urban Areas ◽  
Street Canyon ◽  
Sulfur Hexafluoride ◽  
Passive Control ◽  
Stokes Equations ◽  
Control Methods ◽  
Urban Street Canyon ◽  
Urban Street ◽  
Pollution Concentrations

The present work, focused on the Atmospheric boundary-layer airflows and their interactions with obstacles, particularly in relation to urban air quality, therefore two passive control methods are represented in barriers solid LBWs (Low Boundary Walls) and crossings under building, in order to investigate the dynamic impacts in the center urban canyon road. These passive control solutions are designed for reducing the concentrations airflows polluted necessary, while a correct air quality in the urban areas. For these reasons, the passageways under building and LBWs models have been performed with a two dimensional numerical ANSYS-CFX code, rendering it ideal for examining the concentration distribution within street canyons of H1/H2 = 0.5-1-1.5 and the dynamics effects of pollution concentrations of vehicle emissions of sulfur hexafluoride (SF6), which it is taken as a tracer gas within the symmetrical urban street canyon. However the Reynolds-averaged Navier–Stokes equations and the k-ɛ turbulence model are applied in order to close the equations system. The results achieved are evidence about the diminishing of the pollutant concentrations normalized in in the leeward and windward of the urban street canyon

Influence of cetane improvers on the air quality in an urban street canyon

Chemosphere ◽  
2000 ◽  
Vol 40 (12) ◽  
pp. 1365-1371 ◽  
Author(s):  
H Huang ◽  
Y Akutsu ◽  
M Arai ◽  
M Tamura
Keyword(s):  
Air Quality ◽  
Street Canyon ◽  
Urban Street Canyon ◽  
Urban Street
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