Abstract
Various Countermeasures against urban heat island in the summer season have been proposed such as greening and high albedo surface etc. However, the effects of these countermeasures in winter season have not yet clarified. In order to evaluate the effects of countermeasures, it is necessary to make clear the impacts of these countermeasures in each season. In this paper, the authors have simulated the urban scale climate in summer and winter. The structure of thermal environment in each season was analyzed based on an "Urban Heat-Balance Model". In this analysis, the mechanism of diurnal changes of air temperature and absolute humidity was examined. Furthermore, the environmental influence by greening and high albedo surface was analyzed in each season. In the summer season, these countermeasures have great impact on urban thermal environment. On the other hand, although high albedo surface reduces temperature, there are less impact in the winter season.
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