| City Street Canyon is an important place for outdoor activities of the people at urban heat island effect,under the effect of thermal environment on the city street canyon in outdoor activities of public human comfort influence.The research on Hangzhou City Tianmu Road and Fengtan Road,staff road cross sections as the research object,to Tianmushan Road intersection and Wantang line,the plots can be divided into two groups,each group of 4 samples,each kind of Road North and south sides each with a measuring point,a total of 16 points the foundation,greening,road construction,etc.in the sample survey,in July 2016and January 2017 for the study area of temperature and humidity,solar radiation index data collection.The standardization of data processing and analysis by linear regression analysis,green coverage,plant community structure,plant species,roads,road section and other factors on the air temperature,relative humidity and human comfort effect,the impact of various factors on Green Street Canyon Rehuan environment,based on the results of the study proposed mitigation techniques the Valley of thermal environment of the city street.The main results are as follows:(1)In summer,the road greening has obvious effect on temperature and humidity of the street canyon city thermal environment,green coverage rate is high,the plant community structure is more complex,improving effect on thermal environment more prominent.The cooling of road greening(R~2=0.4118)and moisture(R~2=0.6136)effect and strong correlation among A3-S trees,plots,cooling and humidifying effect,human comfort index is the lowest,the most comfortable body.As a street tree,Koelreuteria cooling and humidifying effect is better than that of camphor,ginkgo.The cooling and humidifying effects of plant communities in summer were more significant than those in winter.(2)In winter,the green coverage has both cooling and warming effect,but the relative humidity change of green environment has not formed a certain law.The accumulated temperature in the south side of the tunnel was lower than that on the north side,and the maximum accumulated temperature and the minimum product temperature difference were 13.7 degrees centigrade.The highest air temperature accumulated temperature B1-N,the highest degree of human comfort;winter temperature and shrubs,herbs correlation degree is higher(R~2=0.703).The difference in temperature of camphor than Koelreuteria paniculata,Ginkgo biloba L.,indicating that the ecological effect of Cinnamomum camphora in summer and winter is relatively stable.(3)Based on the research results of summer and winter,the green coverage rate of green space pattern,plant species and community structure,put forward different relieving greening strategies road space environment in Hangzhou City,to improve the living environment of the street canyon.It can be seen from this study that greening coverage,complex community structure(Joe-irrigation-grass-rattan),mixed planting of evergreen and deciduous trees,and the green belt number of green road forms can be summer and winter Festival to create a comfortable space for the human body environment. |
