Urban-Hazard Risk Analysis: Mapping of Heat-Related Risks in the Elderly in Major Italian Cities |
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| Authors: | Marco Morabito Alfonso Crisci Beniamino Gioli Giovanni Gualtieri Piero Toscano Valentina Di Stefano Simone Orlandini Gian Franco Gensini |
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| Affiliation: | 1Institute of Biometeorology, National Research Council, Florence, Italy;2Interdepartmental Centre of Bioclimatology, University of Florence, Florence, Italy;3Fondazione per il Clima e la Sostenibilità, Florence, Italy;4Department of Agrifood Production and Environmental Sciences, University of Florence, Florence, Italy;5Clinica Medica e Cardiologia, University of Florence, Florence, Italy;Örebro University, SWEDEN |
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| Abstract: | BackgroundShort-term impacts of high temperatures on the elderly are well known. Even though Italy has the highest proportion of elderly citizens in Europe, there is a lack of information on spatial heat-related elderly risks.ObjectivesDevelopment of high-resolution, heat-related urban risk maps regarding the elderly population (≥65).MethodsA long time-series (2001–2013) of remote sensing MODIS data, averaged over the summer period for eleven major Italian cities, were downscaled to obtain high spatial resolution (100 m) daytime and night-time land surface temperatures (LST). LST was estimated pixel-wise by applying two statistical model approaches: 1) the Linear Regression Model (LRM); 2) the Generalized Additive Model (GAM). Total and elderly population density data were extracted from the Joint Research Centre population grid (100 m) from the 2001 census (Eurostat source), and processed together using “Crichton’s Risk Triangle” hazard-risk methodology for obtaining a Heat-related Elderly Risk Index (HERI).ResultsThe GAM procedure allowed for improved daytime and night-time LST estimations compared to the LRM approach. High-resolution maps of daytime and night-time HERI levels were developed for inland and coastal cities. Urban areas with the hazardous HERI level (very high risk) were not necessarily characterized by the highest temperatures. The hazardous HERI level was generally localized to encompass the city-centre in inland cities and the inner area in coastal cities. The two most dangerous HERI levels were greater in the coastal rather than inland cities.ConclusionsThis study shows the great potential of combining geospatial technologies and spatial demographic characteristics within a simple and flexible framework in order to provide high-resolution urban mapping of daytime and night-time HERI. In this way, potential areas for intervention are immediately identified with up-to-street level details. This information could support public health operators and facilitate coordination for heat-related emergencies. |
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