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Urban Materials and Evaporative Cooling for Heat Mitigation in Cities: Adapting Pavement-Watering to Different Parisian Pavements

Abstract : This manuscript examines the use of pavement-watering as a heat mitigation strategy and climate change adaptation tool for cities. The method is fine-tuned for traditional and cool paving materials in order to limit the water footprint of the technique. The first Part of this research is based on field measurements gathered form watering campaigns in Paris from 2013 to 2018. A suited statistical analysis method is proposed in order to determine the microclimatic effects of watering, including effects on air temperature and pedestrian thermal stress using the Universal Thermal Climate Index. Two watering protocols are compared to determine the influence of the surface area being watered on the efficiency and duration of pavement-watering. Secondly, a laboratory experiment is used to compare the thermal behaviour of realistic paving structures under heat-wave like conditions. The pavement undergoes a 24-h climate cycle and watering can be enabled at a fixed frequency. On the basis of surface and in-depth temperature and heat flux measurements, using the surface heat budget, the evaporative cooling flux is determined for each tested watering rate. Results obtained on an asphalt road structure with the lab protocol are compared to field results. Finally, the lab protocol is applied to twelve traditional and cool pavements under dry and watered conditions. Watering is fine-tuned for each structure to maximize cooling and minimize the water consumption using two linear cooling regimes. Driving parameters influencing the optimization of the evaporative cooling versus the watering rate are determined. The surface heat budget and the partitioning of irradiance into conductive, convective, radiative and cooling fluxes are analysed for each paving structure. In the end, the benefits of each pavement, the efficiency of the method and the limitations of the lab protocol are discussed. This research intends to provide useful information for decision-makers considering the use of pavement-watering or cool pavements as heat mitigation strategy. Future work should principally investigate the microclimatic effects of cool pavements combined with pavement-watering to confront lab results to field studies. Those should come with an adapted experimental design, while associated statistical procedures may also require improvements in the future.
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Contributor : Sophie Parison <>
Submitted on : Tuesday, March 9, 2021 - 2:28:11 PM
Last modification on : Wednesday, June 2, 2021 - 4:27:41 PM
Long-term archiving on: : Thursday, June 10, 2021 - 7:08:55 PM


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Sophie Parison. Urban Materials and Evaporative Cooling for Heat Mitigation in Cities: Adapting Pavement-Watering to Different Parisian Pavements. Physics [physics]. Université de Paris, 2020. English. ⟨tel-03163752⟩



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