A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The impact of the three-dimensional greening index on pedestrian thermal comfort in summer street canyons
Trees have been proven to be an effective measure for improving thermal comfort in urban street canyons. Crown height (CH) and tree coverage ratio (TCR) are key factors for shading and cooling efficiency. However, the combined effect of these factors on PET from a three-dimensional perspective remains unclear. This study, using both field measurements and ENVI-met simulations, quantified the independent impacts of 102 tree planting strategies on pavement shading and PET. A three-dimensional greening index (3DGI) was further introduced to quantify the combined effects of these parameters. The results showed that the independent contribution of trees to shading primarily reduces radiative heat transfer, alleviating thermal discomfort. The thermal environment on both sides of the street exhibited significant heterogeneity, with the greatest contribution to shading observed on the north side of E-W street canyons. Based on these findings, the study proposed optimized tree planting strategies for different street orientations and provided the suitable 3DGI ranges for each street orientation, such as 536.30–548.95 for the east side of N-S street canyons. The study recommends prioritizing evergreen trees with greater CH, and adjusting TCR to ensure tree planting strategies on both sides are within the appropriate 3DGI range. Future research will further expand the application of 3DGI, integrating different climatic conditions and time scales to enhance urban residents’ thermal comfort and improve their quality of life.
The impact of the three-dimensional greening index on pedestrian thermal comfort in summer street canyons
Trees have been proven to be an effective measure for improving thermal comfort in urban street canyons. Crown height (CH) and tree coverage ratio (TCR) are key factors for shading and cooling efficiency. However, the combined effect of these factors on PET from a three-dimensional perspective remains unclear. This study, using both field measurements and ENVI-met simulations, quantified the independent impacts of 102 tree planting strategies on pavement shading and PET. A three-dimensional greening index (3DGI) was further introduced to quantify the combined effects of these parameters. The results showed that the independent contribution of trees to shading primarily reduces radiative heat transfer, alleviating thermal discomfort. The thermal environment on both sides of the street exhibited significant heterogeneity, with the greatest contribution to shading observed on the north side of E-W street canyons. Based on these findings, the study proposed optimized tree planting strategies for different street orientations and provided the suitable 3DGI ranges for each street orientation, such as 536.30–548.95 for the east side of N-S street canyons. The study recommends prioritizing evergreen trees with greater CH, and adjusting TCR to ensure tree planting strategies on both sides are within the appropriate 3DGI range. Future research will further expand the application of 3DGI, integrating different climatic conditions and time scales to enhance urban residents’ thermal comfort and improve their quality of life.
The impact of the three-dimensional greening index on pedestrian thermal comfort in summer street canyons
Build. Simul.
Fu, Xiaotong (author) / Zhang, Tailong (author) / Tao, Yizhou (author) / Yan, Shaojun (author) / Qi, Feng (author) / Shen, Yamei (author)
Building Simulation ; 18 ; 641-661
2025-03-01
21 pages
Article (Journal)
Electronic Resource
English
Integrated modeling of pedestrian energy exchange and thermal comfort in urban street canyons
| British Library Online Contents | 2007
Integrated modeling of pedestrian energy exchange and thermal comfort in urban street canyons
| Online Contents | 2007