| Since the 21st century,urban ecological problems have become more and more serious,among which the problem of urban heat island has become a"common problem"in cities.Therefore,how to alleviate the effect of urban thermal environment has become an urgent problem to be solved by academia and government.In view of this,this paper uses the theoretical knowledge of landscape architecture,geostatistics,urban planning and other disciplines,and processes the data of Landsat summer remote sensing image,Point of Interest(POI),night light,population density,land use,evapotranspiration,humidity and rainfall from 2007 to 2018 based on Remote sensing and Geographic Information System(GIS),so as to study the mechanism of the temporal and spatial evolution characteristics of thermal environment effect in the main urban area of Fuyang City.The interannual variation characteristics of urban surface temperature and thermal field in the main urban area of Fuyang City in the past 12 years are obtained.The action mechanism of thermal environment effect is analyzed from three aspects of land use factors,human factors and meteorological factors,and the planning strategy to improve heat island effect is put forward.The main conclusions of this paper are as follows:(1)In each year,there is an obvious heat island effect in the main urban area of Fuyang City,which shows a trend of dispersion first and then concentration with time,and the spatial variation characteristics show a trend of gradual enhancement from northeast to southwest.In terms of time scale,from 2007 to 2013,compared with 2013 to 2018,the proportion of regions with weakened and unchanged thermal field level showed an increasing trend,and the proportion of regions with enhanced thermal field level showed a downward trend;(2)From 2007 to 2018,the urban construction land in the main urban area of Fuyang City increased significantly,which occupied the area of other land use types and affected the change of thermal environment in the main urban area of Fuyang City.The average temperature of each land use type is:impervious surface>cultivated land>forest land>water body.Normalized Difference Vegetation Index(NDVI)profile and temperature profile show the opposite trend characteristics.The more lush the vegetation,the lower the surface temperature,indicating that green vegetation can significantly alleviate the urban heat island effect;Normalized Difference Build-up Index(NDBI)profile and temperature profile show similar trend characteristics.The higher the building density,the higher the surface temperature,indicating that the impervious surface has a significant enhancement effect on the surface temperature.(3)There is a positive correlation between population density and surface temperature.For every 10000 people/km~2 increase in population density in the main urban area of Fuyang City,the surface temperature will increase by 5.360?(2007),2.280?(2013)and 3.560?(2018);There is a positive correlation between night light and surface temperature.For every 1 n W/cm~2/sr increase in night light in the main urban area of Fuyang City,the surface temperature increases by 0.120?(2007),0.120?(2013)and0.140?(2018);There is a positive correlation between POI nuclear density and surface temperature.For every 100 point/km~2 increase in POI nuclear density in the main urban area of Fuyang City,the surface temperature increases by 1.000?(2013)and 0.300?(2018);There is a negative correlation between humidity and surface temperature.For every 0.1 increase in humidity in the main urban area of Fuyang City,the surface temperature decreases by 5.383?(2007),2.645?(2013)and 3.289?(2018);There is a positive correlation between evapotranspiration and surface temperature.For every10000 kg/m~2/8day increase in evapotranspiration in the main urban area of Fuyang City,the surface temperature increases by 1.620?(2007),0.327?(2013)and 0.771?(2018);There is a positive correlation between rainfall and surface temperature.For every 1mm increase in rainfall in the main urban area of Fuyang City in 2007,the surface temperature increased by 0.070?(2013)and 0.120?(2018)(4)After the interaction of all detection factors,there is a synergistic enhancement effect on the spatial differentiation characteristics of thermal environment effects in the main urban area of Fuyang City,and the effects of all impact factors show a nonlinear enhancement mode.NDBI,TC Wetness(wet),NDVI and night light with other factors has a strong explanatory power on the spatial differentiation characteristics of thermal environment effects in the main urban area of Fuyang City. |
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