| Urban thermal environment has always been a hotspot in urban eco-environment research.In this paper,based on UDEM to obtain urban three-dimensional morphological indicators,combined with landscape pattern analysis,geographic detector model and other methods to analyze the correlation between urban three-dimensional morphology,surface index and surface temperature,the introduction of urban heat load pattern Concept,explore the urban thermal environment mechanism from multiple angles,and draw the following conclusions:(1)The three-dimensional form of downtown Jinan is diverse,among which the nature of the old city is diverse and the structure of the building space is complex;the high-rise buildings in the south of the city are clustered and the undulation is high;the northern part of the city is limited by the dispersion of high-rise buildings.Jinan West Railway Station,Xingcun Interchange,Hanyu Golden Valley,Lingxiu City and other regional high-rise buildings gathered.(2)The overall temperature of downtown Jinan increased from 2005 to 2018.Among them,the area of mid-temperature plaques increased significantly from 2005 to 2014,from38251.17hm2 to 44206.02hm2.The area of sub-low temperature plaques changed significantly.The rise in temperature led to temperature plaques Level richness is reduced.According to the seasonal temperature changes,the spatial temperature changes in winter are relatively stable,and are less affected by the topography;temperature changes will lead to the fusion and fragmentation of temperature patches,in which the heterogeneity index of spring landscape pattern(diversity index: 1.3891,uniformity index: 0.8631)the highest.(3 Combined with geographic detectors and correlation analysis methods,urban building height,volume and surface temperature change have a greater correlation,and the spatial structure and fluctuation of the building have a weaker influence on the summer surface temperature change;the interactive influence of the summer building and the water body The largest,impervious to the surface temperature in winter has a greater impact;the interaction of vegetation and water bodies has the best effect on cooling in summer,and the interaction of vegetation and buildings has the best effect on winter insulation.(4)According to the spatial pattern of urban heat load,the areas with high heat sensitivity are mostly distributed with areas with high commercial value and dense population and economic activities,and the characteristics of space heat sensitivity are consistent with the distribution of roads.The heat load problem in Huaiyin District is serious,and its thermal environment is less affected by seasonal changes,so it needs to be adjusted. |
