The Centre of City: Thermal Environment and Spatial Morphology by Junyan Yang & Xing Shi

Author:Junyan Yang & Xing Shi
Language: eng
Format: epub
ISBN: 9789811397066
Publisher: Springer Singapore

Fig. 3.20Contour line character graph of the measured data of June 29. (Source: Prepared by the author)

Fig. 3.21Isoline map of the data measured on Sept. 25

The three on-site measurements showed that the spatial distribution of thermal environment presented variable characteristics, and presented no consistent thermal environment uniform distribution trend which means that within the area of 6 km2, the thermal environment rules were not obvious due to the variable characteristics of the underlying surface. However, we still had verified the following thermal environment characteristics: The variation of surface temperature was greater than that of air temperature, and relative humidity and air temperature showed some certain negative correlation. The measured points can not cover the thermal environment distribution characteristics of the whole central area, but can only reflect the characteristics of the specific point. According to the analysis in the previous chapter, spatial form has a significant influence on the thermal environment via solar radiation environment and wind environment under stable climate conditions. Based on verification of the measured data, ENVI-met software was employed to simulate the thermal environment within an area of 6 km2. In the simulation, the whole central area was divided into 10 districts which were subject to simulation for 10 times with the same parameters. Furthermore, we conducted comparative analysis of the simulation results based on statistics of the mean thermal environment data of 80 blocks (Figs. 3.25 and 3.26). The results completely show the continuously distributed thermal environment characteristics of Xinjiekou central area, Nanking (Fig. 3.22). Figures 3.23 and 3.24 indicate the specific distribution of surface temperature and air temperature of the inner four-ring area of Xinjiekou, from which we can see that the spatial distribution variation of temperature is quite complex. The simulation results show that the variation of mean air temperature is small, while the mean radiation temperature presents complex spatial changes since it is obviously affected by the sunshine (Figs. 3.25 and 3.26).Thermal environment profile analysis

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