Human Heat Health Index (H3i) for Holistic Assessment of Heat Hazard and Mitigation Strategies Beyond Urban Heat Islands
Abstract
Certain urban neighborhoods are more susceptible to heat than others, primarily because of the unequal distribution of imperviousness, building and vegetation morphology, social vulnerability, and anthropogenic heat release. Here, we demonstrate that using the surface urban heat island intensity obtained through remote sensing approaches to evaluate urban heat vulnerability (UHV) can be misleading due to the interannual and seasonal variability of rural land surface temperature (LST). We present the disparity in the heat vulnerability index (HVI) when LST and air temperature are used as hazards and show that the LST-Based approach overestimates the HVI during daytime. Thus, we contend that while HVI may be appropriate for comparing the relative UHV of different neighborhoods, it should not be used to assess absolute daytime heat vulnerability. to address this limitation, we propose a new metric: human heat health index (H3I) that can be utilized to (i) assess and compare heat hazard in different neighborhoods and (ii) evaluate the effectiveness of environmental interventions for heat mitigation. H3I was applied to demonstrate the reduction in heat hazard due to 3-D urban structures using street-level modeling in Austin, Texas. Our findings emphasize the need for combining 3-D urban data, modeling, and community feedbacks efforts to assess daytime UHV for prioritizing the implementation of heat mitigation strategies.
Recommended Citation
H. G. Kamath et al., "Human Heat Health Index (H3i) for Holistic Assessment of Heat Hazard and Mitigation Strategies Beyond Urban Heat Islands," Urban Climate, vol. 52, article no. 101675, Elsevier, Nov 2023.
The definitive version is available at https://doi.org/10.1016/j.uclim.2023.101675
Department(s)
Biological Sciences
Keywords and Phrases
Heat hazard; SOLWEIG; SoVI; SUEWS; Urban heat island; UTCI
International Standard Serial Number (ISSN)
2212-0955
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
01 Nov 2023
Comments
National Science Foundation, Grant 80NSSC22K1675