Effects of cooling roofs on mitigating the urban heat island and human thermal stress in the Pearl River Delta, China

Wang, Xueyuan; Liu, Gang; Zhang, Ning; Liu, Hongnian; Tang, Xiaodong; Lyu, Mengyao; Meng, Handong

doi:10.1016/j.buildenv.2023.110880

Cited by 12 publications

(2 citation statements)

References 66 publications

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“…Many previous researches , Cao et al 2015, Imran et al 2018, Jacobs et al 2018 have found that cooling roofs can effectively reduce the UHI effect in urban areas. Our recent study (Wang et al 2023) has also found that cooling roofs can reduce the canopy and surface UHI intensity in the PRD region. In this study, we further analyze the air temperature differences at the first model level between WRs/GRs and CTL experiment (figure S4 in supporting information) and find that the air temperature significantly decreases in the PRD region.…”

Section: Results and Analysismentioning

confidence: 71%

“…There are three tested scenarios in this work: the first one is a baseline hereafter called 'CTL', in which the cooling roofs are not considered at all, the second one is hereafter called 'WRs', in which all the roofs are white roofs, whose albedo is set to be 0.9, the third one is hereafter called 'GRs', in which all the roofs are green roofs. The selection of physical parametrizations is identical with Wang et al (2023). The more detailed model settings are shown in supporting information.…”

Section: Model and Settingsmentioning

confidence: 99%

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Effect of cooling roofs on gust wind speed over an urban agglomeration in Southern China

Wang,

Liu,

Liu

et al. 2023

Environ. Res. Commun.

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Urbanization has promoted economic growth but it can increase gust wind speed, which may lead to serious damage to infrastructures. This study uses the Weather Research and Forecasting model and a gust parametrization scheme to evaluate the mitigation impact of white roofs and green roofs on wind gust over the Pearl River Delta, an urban agglomeration in Southern China in June, July, and August of 2014. The results show that both white and green roofs decrease the gust wind speed by decreasing the mean wind speed, suppressing the turbulent motion and weakening the convection. The impacts of white roofs are stronger than those of green roofs. The daily mean reductions of gust wind speed are approximately 1.2–1.3 m s−1 (12%–16%) and 0.4–0.6 m s−1 (6%–10%) by white and green roofs, respectively. In general, the contribution of turbulence (60%–85%) to the gust wind speed is the largest, and the contribution of mean wind speed is approximately 10%–30%, however, the effect of deep convection is not obvious (0%–15%) on the decrease of gust wind speed. The effect of cooling roofs on reducing the gust wind speed is stronger during daytime than during nighttime, and the effect is more significant in city areas that have higher building densities. Based on the findings, this study is potentially beneficial for policy-makings in developing urban disaster mitigation methods.

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