Abstract
Increasing urban heat island and global warming have aroused serious thermal environmental problems and even harm people's thermal health. Because of the importance in people's daily life, a commercial pedestrianized block represents a symbol of a city or metropolis; therefore, focusing the attention on the thermal environment in such regions is very necessary. Most of the researches on the urban thermal environment are calculated by remote sensing data; limited by the low spatial resolution of remote sensing image, it may not obviously reflect the true thermal environment of the research site, especially in some microscale regions. Based on this, the new software ENVI-met is developed to research the thermal environment and forecast people's thermal sensation in a microscale region. Therefore, the objective of this study aims at conducting field measurement and numerical simulation to assess the thermal environment of a typical commercial pedestrianized space in southern China and assess the different urban design parameters in ameliorating the urban heat island effect. Our final results demonstrate a quantitative evidence for establishing a comprehensive standard for improving the thermal environment in a microscale region, and this study also can be a supplementary in the research field about improving thermal health.
Highlights
Under the global warming, particular urban heat island (UHI) effect remains a significant issue to tackle, which is a natural phenomenon that refers to surface and air temperature in cities are much higher than it in suburban distracts [1], this phenomenon can deteriorate urban thermal environment, what’s worse, it may do harm to people’s health
The objective of this study aims at conducting field measurement and numerical simulation to assess the thermal environment of a typical commercial pedestrianized space in southern China, and assess the different urban design parameter in ameliorating urban heat island effect
Different from the observation of UHI effect on the platform of remote sensing, the study in micro-scale region is mainly relied on the software ENVI-met, which is a grid-based CFD (Computer Fluid Dynamics) three-dimensional (3D) model that can perform a micro-scale simulation in microclimate with the spatial resolution ranging between 0.5m and 10m within 10s time[17], it can forecast people’s thermal sensation effectively
Summary
Particular urban heat island (UHI) effect remains a significant issue to tackle, which is a natural phenomenon that refers to surface and air temperature in cities are much higher than it in suburban distracts [1], this phenomenon can deteriorate urban thermal environment, what’s worse, it may do harm to people’s health. The research about this issue has been conducted for many years, and has been tested for being influenced by many different factors including canyon geometry [2,3], anthropogenic heat [4], thermal properties of materials [5] and urban vegetation [6,7,8]. Most of the researches on urban thermal environment are calculated by remote sensing data, limited by the low spatial resolution of remote sensing image, it may not obviously reflect the true thermal environment of the research site, especially in some micro-scale regions
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