Characteristics of daytime land surface temperature in wind corridor: A case study of a hot summer and warm winter city

白天 环境科学 风速 城市化 气象学 市区 风向 大气科学 地理 地质学 经济增长 经济 经济
作者
Shaoxiong Lai,Yujie Zhao,Yifan Fan,Jian Ge
出处
期刊:Journal of building engineering [Elsevier BV]
卷期号:44: 103370-103370 被引量:22
标识
DOI:10.1016/j.jobe.2021.103370
摘要

With increasing urbanisation, the fraction of built-up areas and human activities increase, deteriorating the urban thermal environment and air quality. To improve the urban environment, wind corridors have attracted much research attention in recent years. In this study, a sky-view factor (SVF)-based method is proposed and verified for the potential wind corridor detection in a built-up urban area. The proposed method accurately identified wind corridors at a spatial resolution as high as 10 m. Characteristics of daytime land surface temperature (LST) were analysed based on Landsat-8 data. Results show that daytime LST in the wind corridor is higher than that in its adjacent non-corridor areas. To quantify the effect of SVF on LST over urban ground-level surfaces, the quantitative relationship between SVF and LST was analysed in the whole study area. Mean LST was found to increase linearly with SVF at a rate of about 0.2 °C per 0.1 SVF value. Moreover, effects of the underlying surface and urban morphology on LST were also discussed. Water bodies were found to effectively reduce LST, whereas in built-up areas, LST was also affected by building height (negative correlation) and building density (positive correlation). When using building height as a variable, the mean LST difference reached 3.5 °C in four seasons, while it was only 1.2 °C between areas with different building densities. These findings are useful to urban planning and provide insights to evaluate wind corridors’ effectiveness holistically.
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