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Can planning fight the urban overheating and should we tackle the "the urban heat island" per se ?

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Résumé

Extreme temperatures in the built environment receive more audible cues every year as a result of the combined effects of local urban driven heats and climate change (urban overheating). They are in particular associated with increased mortalities during prolonged and severe heat waves, increased heat stress and poor thermal comfort in outdoors, as well as extra loads on energy, water and transport infrastructures. Though local urban heats (surface-, canopy-, boundary layer-) are associated with poor quality and/or lack of urban green in dense urban fabrics, construction materials that facilitate heat trapping and heat storage in the urban fabrics as well as human activities’ heat-related emissions; urban planners and designers are in the foreground of the definition of overheating coping strategies. They are assumed to frame the future urban resilience to heat. This talk will first present the progress in urban climate knowledge vis-a-vis the role of urban forms on urban overheating and heat stress alleviations. It will secondly discuss the major bottlenecks in the implementation of urban overheating coping strategies, discussing in particular the definition of heat and targets in the planning documents. To do so, the study relies on a literature review of the most reputed international scientific works on urban forms & urban heat* since 1980 as well as on the analysis of four French climate action plans (Marseille, Lyon, Besançon, and Strasbourg) and associated planning documents. Though the drivers of urban heats are well-known (also in the urban planner community), the literature review highlighted the difficulties both in urban climate and planning to apprehend the whole scale and dynamics of the urban heats when it comes to urban heat resilience.
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hal-03877696 , version 1 (29-11-2022)

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  • HAL Id : hal-03877696 , version 1

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Manon Kohler. Can planning fight the urban overheating and should we tackle the "the urban heat island" per se ?. Q13 – Paleoclimate changes, landscape evolution and human societies: from sedimentary basins to industrial landscapes, Mar 2022, Strasbourg, France. . ⟨hal-03877696⟩
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