EFFECTS OF BUILDINGS ASPECT RATIO, WIND SPEED AND WIND DIRECTION ON FLOW STRUCTURE AND POLLUTANT DISPERSION IN SYMMETRIC STREET CANYONS: A REVIEW

The issue of air quality conditions has become a major indicator to the quality of life in many urban areas around the world. It was affected by the air pollution in urban street canyons mainly contributed by the vehicle emitted source. Different street canyon geometry and meteorological conditions may cause pollutant accumulation inside street canyon due to lack of ventilation leading to the air quality deterioration. In the last two decades, numerous researches have been conducted through various research approaches to understand the impact of street canyon configurations and wind flow condition on wind flow structure and pollutant dispersion inside street canyons. This paper intends to review state of the art findings of available research approaches with special intentions been given to the effects of street canyon geometry, wind speed and wind direction on wind flow structure as well as pollutant dispersion in symmetric street canyons