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作者

Jian Zhang;Zhonghua Gou;Yi Lu;Pingying Lin

来源

URBAN FORESTRY & URBAN GREENING,Vol.44,Issue1,Article 126422

语言

英文

关键字

PSVFpark sky view factor;FARfloor area ratio;H/Wheight to width ratio;UHIurban heat island;UHIIurban heat island intensity;GnPRgreen plot ratio;ATair temperature;RHrelative humidity;DTSdistance to the sea;MRTmean radiant temperature;BCRbuilding coverage r

作者单位

School of Engineering and Built Environment, Griffith University, Australia;Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong;College of Architecture and Urban Planning, Tongji University, China;School of Engineering and Built Environment, Griffith University, Australia;Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong;College of Architecture and Urban Planning, Tongji University, China

摘要

Sky view factor (SVF), an important geometrical factor for the urban thermal environmental assessment, has a controversial impact in different urban contexts: its value is usually positively correlated with the temperature level in vegetation areas while negatively related to that in built-up areas. This study aims to validate its impacts in vegetation environments, based on the field measurements of 18 urban parks in Gold Coast. A regular grid with 9 points in each park was deployed for the physical measurement of air temperature, air velocity, relative humidity, globe temperature, and SVF. Park sky view factor (PSVF) was proposed to indicate the shading and cooling effect of trees and canopies in parks. Cooling intensity (temperature difference between measured parks and a nearby weather station) and mean radiant temperature (MRT, a thermal comfort index considering objects surrounding the body) were used as the thermal environmental indicators. The study found that PSVF has positive impacts on both park cooling intensity and MRT despite high dense tree may impacts air flow. This research provides evidence and guidance on utilizing urban parks to create thermal comfortable outdoor spaces in subtropical coastal cities.