Study On The Barrier Effect Of The Cooling Effect On The Characteristics Of Building City Greenbelt

With the development of urbanization and industrialization,urban heat island effect has become more and more serious.Urban heat island effect is influenced by urban landscape types(underlying surface)and its pattern.Landscape spatial elements are divided into patches,corridors and matrix.The corridor is the only linear factor of landscape type.Current research on the cooling effect of the surrounding buildings and green barrier effect is very few in the world.In order to reveal the cooling effect of the greenbelt and the barrier effect of buildings on the cooling effect of the greenbelt,this article takes Beijing city as an example,using Landsat-8 image and resource three remote sensing data as the main data source,for the surface temperature inversion and green information extraction in the Beijing city within five rings.The typical greenbelt in Beijing within the fifth ring was selected to carry out the buffer analysis.The surface temperature and air temperature of the grid point between the typical greenbelt and the buildings were investigated by field research.The fitting formulas of temperature and the landscape characteristics of the buildings were obtained by spss and other software.And a barrier model was establishedd.The main results of the study are as follows:(1)The Landsat-8 remote sensing image is used to retrieve the land surface temperature by the single channel algorithm,and the ground temperature distribution map inside the fifth ring of Beijing is obtained.Based on the high definition remote sensing images of resources No.three satellite,the typical greenbelt of Beijing five rings was extracted and the width information of greenbelt was extracted.The greenbelt information and temperature data are superimposed by ArcGIS software,and the left buffer analysis is carried out to get the relation between the width of greenbelt and the temperature in the study area.The conclusions are as follows: with the increase of the width of greenbelt,the range of cooling range of greenbelt is wider,and the range of cooling range firstly increases and then decreases,and reaches the maximum at 36 m~50 m.Combined with the actual investigation of the distribution characteristics of buildings around the greenbelts,the greenbelts distributed aroundthe West Second Ring and the two greenbelts around the 36 m are selected as the research objects.A limited number of buildings are selected along the greenbelt for field surveys.(2)The temperature and surface temperature before and after buildings were measured,we combine the data of building landscape characteristics(height,width),through SPSS software,A single factor analysis of variance and LSD analysis,and multiple regression analysis,were used to compare the locations adjacent to other buildings with identical conditions and those without buildings,the relationship between various factors was analyzed,and the barrier function model of building landscape characteristics was set up to reduce the effect of green belt.Draw a conclusion:Building height has a significant barrier to the decrease of land surface temperature and air temperature,while the temperature,distance from greenbelt and building height are polynomial:Z=30.567-0.035X+0.089Y;the width of building has a significant barrier to the decrease of surface temperature and air temperature,while the temperature,distance from greenbelt and building height are polynomial:Z=30.515-0.03X+0.059 Y.