Green roofs and green walls layouts for improved urban air quality by mitigating particulate matter
Green roofs and green walls layouts for improved urban air quality by mitigating particulate matter
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DOI：
10.1016/j.buildenv.2021.108120
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发表时间：
2021-10
影响因子：
7.4
通讯作者：
Margareth Viecco;H. Jorquera;Ashish Sharma;W. Bustamante;H. Fernando;S. Vera
中科院分区：
文献类型：
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作者：
Margareth Viecco;H. Jorquera;Ashish Sharma;W. Bustamante;H. Fernando;S. Vera
城市空气质量一直是世界上大多数城市长期存在的问题。已经提出了许多策略来解决它，包括提供多种环境效益的绿色基础设施，例如绿色屋顶（GR）和绿色墙壁（GW）。许多研究都集中在GRs和GWs战略，以减轻城市空气污染。然而，据作者所知，这些研究并没有涉及不同的城市形态，特别是建筑物的高度和覆盖率对减轻空气污染的影响。因此，地下发电厂和地下发电厂在减轻空气污染方面的潜力尚未得到充分利用。本文旨在研究不同的GR和GWs的布局，并评估其效率捕获颗粒物（PM2. 5）在城市附近的圣地亚哥，智利。我们使用的met模型来模拟一个大都市地区的建筑物，植被，铺装表面，和交通排放量来估计空气污染的减少不同的建筑物高度和覆盖率的GRs和GWs。我们模拟这些布局和覆盖的圣地亚哥市中心地区，并与基本情况下的结果进行了比较。结果表明，地面站和地下站对空气质量的改善取决于建筑物高度、周围城市基础设施、植被覆盖和污染源的距离。具体而言，研究结果显示，在低层建筑物上覆盖50%-75%的GRs可以改善行人/通勤者层面的空气质量。然而，只有25%的GWs覆盖率才能产生最高的PM2.5捕获。我们的结论是，为了降低PM2. 5浓度，应优先考虑在建筑物高度低于10米安装GR。对于GWs，PM2.5减排在所有情况下都是有利的。模拟结果还表明，与基本情景相比，GRs和GWs的组合使用可以将圣地亚哥的PM2.5降低7.3%。
Urban air quality has been a long-standing problem in most cities worldwide. Many strategies have been proposed to solve it, including green infrastructures such as green roofs (GRs) and green walls (GWs) that provide multiple environmental benefits. Many studies have focused on GRs and GWs strategies to mitigate urban air pollution. However, to the best of authors’ knowledge, these studies have not dealt with different urban morphologies, specifically the impact of building heights and coverage ratios of GRs and GWs on mitigating air pollution. Therefore, the potential of GRs and GWs to alleviate air pollution has not been fully exploited. This paper aims to investigate different GRs and GWs layouts and evaluate their efficacy for capturing particulate matter (PM2.5) in an urban neighborhood of Santiago, Chile. We use ENVI-met model to simulate a metropolitan area with buildings, vegetation, paved surfaces, and traffic emissions to estimate air pollution abatement for varying building heights and coverage ratios of GRs and GWs. We simulate these layouts and coverage for a downtown area of Santiago, and results were compared with the base case scenario. Results showed that the air quality improvement by GRs and GWs depends on building height, surrounding urban infrastructure, vegetation cover and proximity to the pollutant source. Specifically, results showed that 50%–75% of GRs coverage on low-rise buildings could improve air quality at the pedestrian/commuter level. However, just a 25% coverage of GWs yields the highest PM2.5capture. We conclude that to decrease PM2.5concentrations, priority should be given to instal GRs in buildings lower than 10 m in height. For GWs, the PM2.5abatement is favorable in all cases. ENVI-met results also show that the combined use of GRs and GWs could reduce PM2.5up to 7.3% in Santiago compared to the base case scenario.