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主办单位:重庆大学
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国际标准刊号:ISSN 2096-6717
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屋顶绿化对室外微气候的降温增湿效果
彭明熙1, 杨真静1,2
1.重庆大学 建筑城规学院, 重庆 400045;2.重庆大学 山地城镇建设与新技术教育部重点实验室, 重庆 400045
摘要:
在高密度城市中,建筑屋顶具有巨大的开发利用潜力,通过结合绿化打造屋顶休闲空间,不仅可以改善屋顶上部微气候,还能有效提高城市绿量。以重庆典型气候条件下绿化屋顶常用的3种屋顶绿化植物为研究对象,采用实测与理论分析相结合的方法,探究不同屋顶绿化植物对周围环境的降温增湿效果。实验结果表明,屋顶绿化的降温增湿作用从正午高温之后持续至次日日出,增湿作用夜间效果更为突出,植物的降温效果在其表面最显著;植物叶面积指数与其反射辐射量呈反向相关。3种植物中,小叶景天综合效果最好,在其表面日间最大降温11.7℃,在300、700 mm处夜间分别降温4.64、3.97℃,其最大增湿效果出现在19:00,增湿33.1%。
关键词:  屋顶绿化  室外气候  降温增湿  景天植物  叶面积指数
DOI:10.11835/j.issn.2096-6717.2019.085
分类号:TU111.4
基金项目:国家重点研发计划(2016YFC0700302);国家自然科学基金(51508048)
Cooling and humidification effect of green roof on the outdoor microclimate
Peng Mingxi1, Yang Zhenjing1,2
1.College of Architecture and Urban Planning, Chongqing University, Chongqing 400045, P. R. China;2.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
Abstract:
Green roof has been recognized as a complement of urban green and an ecological solution to mitigate urban heat island (UHI) effects. The benefits of green roof in microclimate at the building scale have been identified by previous studies, but some quantitative data of the wider influence on neighborhood microclimate are still needed. Therefore, a field measurement was conducted in Chongqing to investigate the green-roof effects on outdoor microclimate. From the derived data, it has been verified that the thermal benefits of green roof begin from the high temperature noon to the next sunrise, and the humidification effect was more prominent at night, the most significant cooling effect of plants was at the surface. Meanwhile, the leaf area index of plants was inversely correlated with the amount of reflected radiation. The Sedum Makinoi had the best combined effect of three plants, the maximum cooling temperature was 11.7℃ during the day and the temperature was 4.64℃ and 3.97℃ respectively at 300 mm and 700 mm, the maximum humidification effect appeared at 19:00 at sunset and humidified 33.1%.
Key words:  green roof  outdoor microclimate  cooling and improving humidity effect  sedum plants  leaf area index
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