Longitudinal Study of Urban Heat Island Phenomena in Rapidly Developing Cities: The Case of Gurugram

Urban Heat Island (UHI) effects have emerged as a critical challenge in rapidly urbanizing regions, particularly in the National Capital Region (NCR) of Delhi, where unplanned urban expansion has significantly intensified localized warming. This study investigates the spatiotemporal dynamics of UHI across Delhi NCR, with a specific focus on Gurugram, which has been identified as the epicenter of the highest Urban Heat Island Intensity (UHII). Among the satellite cities of Delhi, Gurugram exhibits the most pronounced fluctuations in Land Surface Temperature (LST), a phenomenon driven by rapid urbanization, fragmented green infrastructure, and the proliferation of impervious surfaces. The research systematically analyses UHI patterns in Gurugram across seasonal and diurnal cycles, revealing distinct trends. Summer daytime UHI demonstrates significant interannual variability, with a peak intensity observed in 2017. In contrast, nighttime UHI remains relatively stable across both summer and monsoon seasons, indicating that daytime UHI is more sensitive to urban morphological changes, while nighttime heat retention is influenced by the thermal inertia of built-up surfaces and structural properties of the urban environment. Key drivers of UHI intensification in Gurugram include rapid population growth, the expansion of impervious surfaces, declining vegetative cover, and the scarcity of water bodies. Although there has been a marginal improvement in urban tree cover in recent years, the relentless expansion of built-up areas has offset these gains, exacerbating UHI effects. These findings highlight the urgent need for targeted urban planning interventions that address the seasonal and diurnal behavior of UHI. Potential strategies include the integration of sustainable cooling solutions, such as cool roofs and pavements, the enhancement of green infrastructure through tree canopy expansion, and the restoration and optimization of water bodies. By providing a comprehensive understanding of UHI dynamics in Gurugram, this study contributes to the growing body of knowledge on urban climate resilience. It underscores the importance of context-specific mitigation strategies that account for the unique spatiotemporal characteristics of UHI, offering actionable insights for policymakers and urban planners to foster sustainable and climate-resilient urban development in rapidly growing cities.