How to Design a Park and Its Surrounding Urban Morphology to Optimize the Spreading of Cool Air?

Jérémy Bernard, Auline Rodler, Benjamin Morille, Xueyao Zhang
2018 Climate  
Green areas induce smaller increases in the air temperature than built-up areas. They can 1 offer a solution to mitigating the Urban Heat Island impacts during heat waves since the cool air 2 generated by a park is diffused into its immediate surroundings through forced or natural convection. 3 The purpose of this study is to characterize the effect of several variables (park size, morphology 4 of surrounding urban area and wind speed) on the spreading of cool air. A parametric study 5 is
more » ... ic study 5 is performed to run computational fluid dynamic simulations. The air temperature entering the 6 computational domain was set at 35°C, and the 2-m high surface included within the 34°C isotherm 7 was defined as an indicator of cool air spreading. The effects of park shape and orientation are 8 negligible in comparison with its size effects. The number of buildings is better correlated with the 9 cooled surface area than the typical urban parameters identified in the literature (i.e. building density, 10 aspect ratio or mean building height). Since the number of buildings is obviously related to the 11 number of streets, this result suggests that the greater the number of streets around a park, the wider 12 the area that cool air spreads. 13
doi:10.3390/cli6010010 fatcat:yarzbjkuurftvl4jntormi7rdm