School of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China.
Int J Environ Res Public Health. 2022 Oct 8;19(19):12895. doi: 10.3390/ijerph191912895.
With the rapid growth of populations worldwide, air quality has become an increasingly important issue related to the health and safety of city inhabitants. There are quite a few factors that contribute to urban air pollution; the majority of studies examining the issue are concerned with environmental conditions, building geometries, source characteristics and other factors and have used a variety of approaches, from theoretical modelling to experimental measurements and numerical simulations. Among the environmental conditions, solar-radiation-induced buoyancy plays an important role in realistic conditions. The thermal conditions of the ground and building façades directly affect the wind field and pollutant dispersion patterns in the microclimate. The coupling effect of wind and buoyancy on the urban environment are currently hot and attractive research topics. Extensive studies have been devoted to this field, some focused on the street canyon scale, and have found that thermal effects do not significantly affect the main airflow structure in the interior of the street canyon but strongly affect the wind velocity and pollutant concentration at the pedestrian level. Others revealed that the pollutant dispersion routes can be obviously different under various Richardson numbers at the scale of the isolated building. The purpose of this review is therefore to systematically articulate the approaches and research outcomes under the combined effect of wind and buoyancy from the street canyon scale to an isolated building, which should provide some insights into future modelling directions in environmental studies.
随着世界人口的快速增长，空气质量已成为与城市居民健康和安全息息相关的重要问题。有许多因素导致城市空气污染；大多数研究这个问题的人都关注环境条件、建筑几何形状、源特征和其他因素，并采用了各种方法，从理论建模到实验测量和数值模拟。在环境条件中，太阳辐射引起的浮力在实际条件下起着重要作用。地面和建筑外墙的热条件直接影响微气候中的风场和污染物扩散模式。风与浮力对城市环境的耦合效应是当前热门且吸引人的研究课题。该领域已经进行了广泛的研究，一些研究集中在街道峡谷尺度上，发现热效应对街道峡谷内部的主要气流结构没有显著影响，但对行人高度的风速和污染物浓度有强烈影响。其他人揭示了在孤立建筑物尺度上不同的理查森数下，污染物的扩散路径可能明显不同。因此，本次综述的目的是系统地阐述街道峡谷尺度到孤立建筑物尺度下风与浮力的综合作用下的方法和研究成果，这应该为环境研究中的未来建模方向提供一些见解。
