关键词: 大气环境, 城市街谷, 物理模拟, 数值模式

Abstract: High pollution levels often occurred in urban street canyon due to the increased traffic emissions and reduced natural ventilation. The main methods for studying the atmospheric environment in street canyons include field observations, reducedscale physical models and mathematical models. Field observations and physical models may be used to investigate pollutant transportation and dispersion within urban canyons and validate numerical models. On the other hand, validated numerical models are often applied to simulate in detail atmospheric dispersion within the urban canopy. The numerical results in combination with physical model and/or field data may be used to assess urban air quality and support decisionmaking for pollution control strategies and traffic planning. This article provides an overview of studying on atmospheric environment within street canyons in the latest decades.

Key words: atmospheric environment, street canyon, physical model, numerical model