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<p>This study aimed to explore seasonal heat stress vulnerability, its effects on bioclimatic and ecological conditions, along the influence of socio-physical factors on its spatial and temporal variation. The intensifying Urban Heat Island (UHI) effect, exacerbated by rapid urbanization and climate change, highlighted the urgency of evaluating heat stress vulnerability in Guwahati City. To address this, the study utilized Sentinel-2A and Landsat 8/9 data to derive key meteorological indices, including Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), Modified Built-up Index (MBUI), and Modified Normalized Difference Water Index (MNDWI). These indices, along with population density data, were analysed using the composite Z-score method to evaluate spatial patterns of heat stress. Additionally, the Relative Strain Index (RSI) and the Urban Thermal Field Variance Index (UTFVI) were employed to assess the bioclimatic condition and UHI intensity, respectively. The findings revealed that heat stress vulnerability peaked in June within densely populated commercial areas, affecting an area of 48.67 sq. km and impacting 299 residents. RSI indicated that June (12&#xa0;days) and July (17&#xa0;days) fell within the 0.40–0.50 range, signifying heat stroke risk for all populations. The UTFVI further showed that the most severe ecological stress occurred in June, covering 10.35 sq. km. A strong positive correlation between population density and LST (r = 0.73), and a strong negative correlation between NDVI and LST (r = -0.93) in June, underscored the adverse thermal impacts of urbanization.</p>

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Guwahati City Under Heat: Evaluating Vulnerability to Heat Stress Amidst Urban Expansion

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Pixi Gogoi,
  • Princi Gogoi

摘要

This study aimed to explore seasonal heat stress vulnerability, its effects on bioclimatic and ecological conditions, along the influence of socio-physical factors on its spatial and temporal variation. The intensifying Urban Heat Island (UHI) effect, exacerbated by rapid urbanization and climate change, highlighted the urgency of evaluating heat stress vulnerability in Guwahati City. To address this, the study utilized Sentinel-2A and Landsat 8/9 data to derive key meteorological indices, including Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), Modified Built-up Index (MBUI), and Modified Normalized Difference Water Index (MNDWI). These indices, along with population density data, were analysed using the composite Z-score method to evaluate spatial patterns of heat stress. Additionally, the Relative Strain Index (RSI) and the Urban Thermal Field Variance Index (UTFVI) were employed to assess the bioclimatic condition and UHI intensity, respectively. The findings revealed that heat stress vulnerability peaked in June within densely populated commercial areas, affecting an area of 48.67 sq. km and impacting 299 residents. RSI indicated that June (12 days) and July (17 days) fell within the 0.40–0.50 range, signifying heat stroke risk for all populations. The UTFVI further showed that the most severe ecological stress occurred in June, covering 10.35 sq. km. A strong positive correlation between population density and LST (r = 0.73), and a strong negative correlation between NDVI and LST (r = -0.93) in June, underscored the adverse thermal impacts of urbanization.