Spatio-temporal planning of urban neighborhoods in the context of global climate change: Lessons for urban form design in Tehran, Iran

There is a growing concern in recent years about temperature rise resulting from climate change, especially in high-density urban areas, where it is exacerbated in urban heat islands (UHI). In hot and dry climates, this concern makes it necessary to find a practical solution to adapt to climate change. Rapidly developed cities with large populations, due to ignoring the creation of UHI in planning, mostly have fallen into severe trouble. So, finding the influence of decisions' impacts on urban climate before implementing them would inform planners about the consequences of their decisions. Advanced 3D-4D numerical models like ENVI-met are becoming a frequent way of investigating climatic impacts of decisions and regulations. However, full-scale modeling of a neighborhood or a city cannot be widely possible at present. Therefore, a practical solution is simplification of small-scale models to calculate the consequences of decisions in developments. In this study, we systematically propose some solutions for cooling urban neighborhoods, and then, after analyzing them, possible scenarios for UHI mitigation are presented. The goal is to find the most effective urban form and design strategies across a typical range of Tehran urban development at a high-density urban fabric. Our results provide insight into the impact of urban form and design on microclimate in hotter and drier future cities by considering water shortage and utilizing mitigation strategies.