透水路面反射率对热环境参数的影响分析

Analysis of Influence of Permeable Pavement Reflectivity on Thermal Environment Parameters

摘要:

为探究透水路面反射率对室外热环境参数的影响规律，选取孔隙率为15%、20%、25%的透水混凝土试件，进行现场实测试验。采集各试件的反射率、表面温度及0.2 m高度处的平均辐射温度，进行回归分析和相关性统计。研究发现：试件反射率随孔隙率增大而减小，存在一定的相关性，相关系数为-0.903；孔隙率增大，反射率减小，对应的试件表面温度升高，而0.2 m处的平均辐射温度降低。研究表明，透水混凝土孔隙率不仅能直接影响反射率，对表面温度和近地面热环境亦产生复合影响。选择孔隙率较大的透水混凝土作为下垫面，可以在一定程度上降低室外环境的温度。研究成果对于提升城市户外活动空间的环境质量，推动绿色低碳出行环境的实现具有重要的实际意义。

Abstract:

To explore the influence of permeable pavement reflectivity on outdoor thermal environmental parameters, the field measured experiments are conducted by using the permeable concrete specimens with the porosities of 15%, 20%, and 25%. The reflectivity, surface temperature and the average radiant temperature at a height of 0.2 m of each specimen are collected for regression analysis and correlation statistics. The research results show that the reflectivity of the specimens decreases with the increase of porosity, and there is a certain correlation. The correlation coefficient is -0.903. When the porosity increases and the reflectivity decreases, the corresponding surface temperature of the specimen rises, while the average radiation temperature at 0.2 m decreases. These findings indicate that the porosity of permeable concrete not only directly influences the reflectivity, but also exerts a compound effect on both surface temperature and the near-ground thermal environment. The permeable concrete with higher porosity is selected as the underlying surface, which is able to lower the temperature of the outdoor environment to a certain extent. The research achievements have significant practical significance for improving the environmental quality of urban outdoor activity spaces and promoting the realization of a green and low-carbon travel environment.