There is an increasing demand for cooling cities because of its importance on human health and the quality of life in outdoor urban spaces. However, the development of methods in improving outdoor thermal comfort and zoning cities based on outdoor thermal comfort is still challenging. In this work, we propose a new approach to cities zoning from the lens of outdoor thermal comfort in the arid climate of the city of Mashhad, Iran, and investigate the impacts of urban form characteristics on pedestrian thermal comfort. The effects of complex urban form parameters including height to width (H/W) ratio, canyon orientation, tree canopy cover, and building surface materials on the thermal comfort of pedestrians were studied in the arid climate of Mashhad. Microclimate simulation and analysis is conducted in ENVI-met software, and ArcMap is used to calculate Mashhad urban heat islands. Path analysis in SPSS presents an urban form formulation, which predicts approximate outdoor thermal comfort condition in current and future urban context of Mashhad and other cities with the same climate. We finally demonstrate the use of our research method as an alternative method for all cities: urban heat island (UHI) zoning can be used as a substitute for urban form zonings based on outdoor thermal comfort, especially in large cities where data collection on urban form can be difficult due to limited time and resources.

由于冷却对人类健康和户外城市生活质量的重要性，因此对冷却城市的需求不断增加。然而，基于室外热舒适性来改善室外热舒适性和对城市分区的方法的开发仍然具有挑战性。在这项工作中，我们从伊朗马什哈德市干旱气候的室外热舒适度的角度提出了一种新的城市分区方法，并研究了城市形态特征对行人热舒适度的影响。在马什哈德干旱气候下，研究了复杂的城市形态参数，包括高宽比（H / W），峡谷朝向，树冠覆盖和建筑表面材料对行人的热舒适性的影响。小气候模拟和分析是在ENVI-met软件中进行的，ArcMap用于计算马什哈德城市热岛。SPSS中的路径分析提供了一种城市形式公式，该公式可以预测Mashhad和其他具有相同气候的城市在当前和将来的城市环境中的近似室外热舒适条件。最后，我们证明了我们的研究方法可作为所有城市的替代方法：基于室外热舒适性的城市热岛（UHI）分区可替代城市形式的分区，尤其是在以城市形式收集数据的大城市中由于时间和资源有限，可能会很困难。