Thermal Environment And Urban Form Coupling Research In Central District

First of all, the related concepts of urban thermal environment is elaborated, research-scale urban canopy energy balance, the urban heat island and other basic theory is introduced, from the perspective of urban planning discipline of urban thermal environment were reviewed, for domestic and urban spatial morphology and thermal Environmental studies and thermal environment simulation technology and methods to focus research.In chapter 2, research on the use of ENVI-met software to build an ideal model of urban spatial morphology, quantitative analysis under varying conditions of single index of space form the mechanism of the thermal environment. The overall layout of the levels into density index, height indicators, strength indicators, specifically the level of SVF, street of H/W and orientation, BESA, PSHA, surrounded degree, the underlying surface level there are specific vegetation cover,surface ISA and albedo materials. Under certain ideal simulated conditions, with the thermal environment has a significant influence spatial correlation between morphological quantitative indicators have density, average height, SVF, vegetation cover and ISA, there is a greater correlation between street of H/W and orientation, BESA, PSHA, surrounded degree and albedo. Also qualitatively different urban land use and human impact of heat were evaluated.In chapter 3, through on-site measurements and software simulations to explore the spatial and temporal differences in heat island from the city scale for Xinjiekou central district in Nanjing, analyze the specific characteristics of the thermal environment differences in spatial morphological types of groups from the central area of the building scale. The central district of the Gulou Square, Daxinggong Square in an open district of surface temperature is higher than in other regions, the summer surface temperature significantly affected by solar radiation. The average air temperature is close by wind environmental impact, wind simulation under static conditions, the overall air temperature is insignificant, slightly above the region in other regions. Zhujiang Road and south of Zhujiang Road region, Zhongshan Road.Changjiang Road, Gulou Park, etc. Due to the dense vegetation canopy shade, so noon thermal comfort is more appropriate. Using multiple linear regression method Xinjiekou central district 80 plots simulated thermal environment coupled with spatial morphology index analysis showed the average surface temperature in summer midday with ground water impermeability than, sky view factor, building cover ratio, building height more strongly correlated. The average air temperature in summer midday simulation between a weak correlation with the index coupling.In chapter 4, from the building intensity, the horizontal form, vertical form three levels of the central district of space form a more comprehensive classification type, select Xinjiekou central district 20 sample cases, spatially morphological characteristics, environmental characteristics and impact analysis of the thermal mechanism. Shape and position of the horizontal top ventilation have a major impact on land inside, resulting in differences in spatial form of cooling capacity. Three categories of land cover by comparing the high low intensity, simplified and merge, there is a certain correlation was found between the building density 20 cases of samples, vegetation cover, impervious area ratio. Impervious area is more intense than with the vegetation coverage was negative linear correlation between the development of strength and vegetation cover is greater than the correlation between the development of strength and impervious area ratio. Land with vegetation cover certain related functions, integrated form and function, the central region of vegetation cover distribution situation:Campus Historic District> residential district> office> large commercial business complex, and impervious surface area than the positive distribution substantially opposite situation. Through the center of the fish eye can directly reflect the building orientation and enclosed,sky view factor relationship with solar radiation, wind roses stacked, you can visually evaluate the site fast solar radiation and ventilation. Three sets of sample bias toward southwest direction, confining degree compact plot> parallel plot> interspersed plot.Finally, from urban planning, architecture, landscape three levels, heat generation and heat dissipation two dimensions summed up 35 urban thermal environment to optimize specific mitigation measures. In this paper, the integrated use of Ecotect, ENVI-met, Ray-man, GIS and other climate simulation analysis software, induction heat environment analysis and practical method:urban heating and cooling area of the map analysis, urban design, integrated use of sun trajectories, wind Diversity analysis method Thermal analysis methods and urban open spaces roses superimposed building fish eye diagram.