The green embracing the urbe: dynamics between green infrastructure and urban structures in hot–humid climates under future climate scenarios
Local Climate Zones, green infrastructure, microclimate, thermal comfort, computational simulation, climate projections.
The process of urban expansion and climate change intensifies thermal challenges in tropical regions, where the reduction of green spaces and tree cover exacerbates the issue, highlighting the need for mitigation strategies and enhancement of urban resilience, especially in light of future climate projections indicating worsening thermal impacts. This research addresses the interaction between urban green infrastructure (UGI) and urban dynamics in hot and humid low-latitude climates, with an emphasis on climate projections for 2050 and 2090. The study aims to fill an existing gap by investigating, through computational simulation, the microclimatic behavior and thermal comfort in hypothetical scenarios considering various UGI configurations and urban parameters. The urban structures analyzed are based on the categorization of Local Climate Zones (LCZ), as proposed and systematized by Stewart and Oke (2012). The methodology involves stages comprising the characterization of LCZs, acquisition and analysis of climatic data, development of hypothetical scenarios with diverse UGI arrangements, and assessment of microclimatic conditions and thermal comfort considering urban parameters. Partial results indicate that UGI integration promoted reductions in air temperature of up to 0.6°C during peak insolation periods, especially in tree-covered areas. There was an increase in relative humidity of approximately 2%, particularly in locations with higher vegetation coverage. Air velocity decreased by up to 0.7 m/s in more sheltered areas. A significant reduction in mean radiant temperature of around 8°C was observed. The Physiological Equivalent Temperature (PET) thermal comfort index showed substantial improvement, with reductions of up to 6°C during the hottest periods, indicating improved comfort conditions in urban areas. The spatial arrangement and orientation of interventions proved to be determining factors for microclimate quality, with green facades oriented along the East-West axis and tree canopy in open areas favoring more adequate thermal conditions. These findings provide important support for advancing discussions on sustainable heat mitigation strategies in low-latitude tropical regions, highlighting nature-based urban solutions as tools for formulating resilient and sustainable urban development public policies. The ongoing research reinforces the importance of integrating urban planning and UGI to promote thermal comfort in cities.