STUDY ON URBAN HEAT ISLAND MITIGATION EFFECT BASED ON SURFACE HEAT BUDGET ON ENVIRONMENTAL CONSIDERATION TYPE PAVEMENTS

Various pavement surfaces to mitigate the urban heat island are suggested. In this study, thermal characteristics of pavements for urban heat island measures are examined from the observation and analysis of surface heat budget. Net radiation, surface temperature, temperature under the surface, conduction heat flux, the weight of cores in each experimental surface and weather condition are observed. Evaporative flux is estimated from the observation results of the weight of cores. The surface heat budget under the same weather condition is examined, and sensible heat fluxes from each object surface are calculated. The parameters having the influence on surface heat budget, for example, solar reflectance (albedo), evaporative efficiency, heat conductivity, heat capacity, are examined.