Abstract
The Mediterranean region is a hot spot for climate change, and cities of this area will be exposed to both increasing temperatures and decreasing precipitations. Green Infrastructures (GIs) can lower urban temperatures through evapotranspiration with an adequate soil moisture content. Grey water reuse can both guarantee the right soil moisture content and reduce freshwater exploitation. In order to test the effectiveness of soil moisture on reducing air temperature, two modelling simulations ran with the microclimate CFD-based model ENVI-met 4.0. The chosen day was a registered heat wave (7 July 2019) in Lecce, a city of south Italy, which was selected as case study for the Mediterranean area. The results demonstrated the effectiveness of soil moisture on evapotranspiration in reducing air temperature. From a circular economy perspective, the supply of grey water for urban GIs represents a strategic adaptation strategy to the expected effects of climate change on the Mediterranean basin.
Highlights
The Mediterranean region is a hot spot in terms of climate change [1], with projections that show the temperature will rise and precipitation will decrease [2]
It has been shown that Green Infrastructures (GIs, such as urban parks and gardens, green roofs and walls, street trees and hedges) can lower urban temperatures [4,5,6]
Parks have been demonstrated to play a significant role in reducing the Urban Heat Island (UHI) effect and lowering air temperature [7,8,9] with a cooling effect, referred to as the Park
Summary
The Mediterranean region is a hot spot in terms of climate change [1], with projections that show the temperature will rise and precipitation will decrease [2]. Cities in this area will be exposed to both thermal issues and water scarcity. Parks have been demonstrated to play a significant role in reducing the Urban Heat Island (UHI) effect and lowering air temperature [7,8,9] with a cooling effect, referred to as the Park. Urban vegetation is a mitigation tool for hot temperatures that works through direct shading on surfaces around plants and evapotranspiration that acts on latent heat fluxes, significantly reducing the quantity of heat that would be re-emitted by surfaces [12]
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