The Role of Canopy Height of Urban Green Spaces on Human Bioclimatic Comfort, (Case Study: NAZHVAN Park in Isfahan)

The thermal characteristics of an area are not affected lonely by climatic conditions and its seasonal changes; other factors such as urban geometry, vegetation and aquatic elements can be effective in improving thermal comfort. Improving thermal comfort is one of the important goals in designing urban open spaces. The heat island is an effective factor in the thermal comfort of the urban sub-climate and the vegetation is also effective in controlling the heat island. One of the effective solutions in controlling the heat island of open spaces is to be aware of the different characteristics of different vegetation that control the impact of this phenomenon. The aim of this study was to investigate the impact and importance of vegetation and their height in the topography of the site, as one of the most widely used and effective tools in designing the quality of thermal comfort in designing part of the urban open space of Nazhvan Park in the west of the city. Isfahan and provide an optimal model of vegetation height in topography. Data collection method, field, analytical and quantitative, with comparative analysis method of proposed design options using simulation in ENVI-met software (4.4.4) in nine different vegetation patterns With a fixed plant type in ten different points of the site on June 15, 2017, and the criteria for measuring thermal comfort at the site are: air temperature, relative humidity, air flow and average radiant temperature and the index used in This study is PMV, which is one of the most comprehensive methods for estimating thermal comfort. The results indicate that a large number of trees, on the one hand, and higher trees on the other, as well as changes in topographic height, are very effective in changing and improving thermal comfort.