The Influence Of Greening On Ambient Temperature In Canyon At Summer&Winter

Greening is one of the main ways to improve the thermal environment in the city.However,there is no clear report on the study of urban green environment from quantitative indicators.In this study part of the Xueyuan road was selected as the research object.The green space form,green coverage,building location,pavement and other basic conditions were investigated and the environmental factors such as temperature,humidity and solar radiation were determined.The air temperature,humidity,human comfort index,average radiation temperature,wet-bulb black-ball temperature,solar radiation and other street canyon thermogram were analyzed and compared.Research the contribution rate of improve the thermal environment in different green forms and the suggestion of street greening optimization is put forward based on the research results.the results are as follows:1)Road greening situation:The main forms of green in Xueyuan road is Sample 1:single line camphor on east side and single line platanus on west side;Sample 2:open space on east side and a campanulaceae on west side;Sample 3:a line camphor and a line platanus with Greenbelt on both sides;Sample 4:a line camphor and a line platanus with Greenbelt on east side and open space on west side.The road is one plate of two and sample plots are covered with green cover of is 20.82%,5.45%,48.78% and 24.84% respectively.The sidewalks are paved with granite and the non-motorized lanes are paved with asphalt.2)Influence of Greening on Temperature and Humidity in Summer Street canyon: The results showed that greening can significantly increase the temperature and humidity,improve the human comfort index and reduce the surface temperature of the pavement in summer.A row of camphor and his party platanus with green belt green space form the best to improve the thermal environment can reduce the air temperature 2.55 ℃,humidification rate was 26.05%,reduce the human comfort index 2.0453.3)Influence of Greening on Temperature and Humidity in Winter Street canyon:The results showed that greening in winter could slightly increase the air temperature and increase the air humidity,thus improving the comfort index of the human body is limited.One of the greening forms of camphorade has the best effect on improving the thermal environment.The height and air temperature can be 0.7 ℃,and the dehumidification rate is 4.94%,Improve human comfort index 0.5.Influence of Greening on Temperature and Humidity in Winter Street canyon:Pass the test Greening can significantly increase the temperature and humidity,improve the human comfort index and reduce the surface temperature of the pavement in summer.A row of camphor and his party platanus with green belt green space form the best to improve the thermal environment can reduce the air temperature 2.55 ℃,humidification rate was 26.05%,reduce the human comfort index 2.0453.It is concluded that : Which changes the degree of road space temperature and humidity in trees with high green coverage area.We should increase the coverage of arbor greening and the use of multi-street tree + green belt and deciduous and evergreen mixed green space form when in greening in the road.And reduce solar radiation area should be adopted in the appropriate location.To alleviate the heat island effect in urban street canyon.