首页|The use of green infrastructure and irrigation in the mitigation of urban heat in a desert city
The use of green infrastructure and irrigation in the mitigation of urban heat in a desert city
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Severe urban heat,a prevalent climate change consequence,endangers city residents globally.Vegetation-based mitigation strategies are commonly employed to address this issue.However,the Middle East and North Africa are under investigated in terms of heat mitigation,despite being one of the regions most vulnerable to climate change.This study assesses the feasibility and climatic implications of wide-scale implementation of green infrastructure(GI)for heat mitigation in Riyadh,Saudi Arabia—a representative desert city characterized by low vegetation coverage,severe summer heat,and drought.Weather research forecasting model(WRF)is used to simulate GI cooling measures in Riyadh's summer condition,including measures of increasing vegetation coverage up to 60％,considering irrigation and vegetation types(tall/short).In Riyadh,without irrigation,increasing GI fails to cool the city and can even lead to warming(0.1 to 0.3 ℃).Despite irrigation,Riyadh's overall GI cooling effect is 50％lower than Gl cooling expectations based on literature meta-analyses,in terms of average peak hour temperature reduction.The study highlights that increased irrigation substantially raises the rate of direct soil evaporation,reducing the proportion of irrigation water used for transpiration and thus diminishing efficiency.Concurrently,water resource management must be tailored to these specific considerations.
green infrastructureevapotranspiration coolingdesert cityirrigationurban overheating
Kai Gao、Shamila Haddad、Riccardo Paolini、Jie Feng、Muzahim Altheeb、Abdulrahman AI Mogirah、Abdullatif Bin Moammar、Mattheos Santamouris
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School of Built Environment,Faculty of Arts,Design and Architecture,University of New South Wales,Sydney,NSW 2052,Australia
Institute of Future Cities,Chinese University of Hong Kong,Hong Kong,China
Department of Building Environment and Energy Engineering,The Hong Kong Polytechnic University,Hong Kong,China
Royal Commission of Riyadh City,Riyadh,Saudi Arabia
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Royal Commission of RiyadhOpen Access funding enabled and organized by CAUL
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