State Key Lab of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
State Key Lab of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
Sci Total Environ. 2018 Sep 1;634:1119-1125. doi: 10.1016/j.scitotenv.2018.04.041. Epub 2018 Apr 11.
The urban heat island (UHI) effect has been a great threat to human habitation, and how to mitigate this problem has been a global concern over decades. This paper addresses the cooling effect of a novel permeable pavement called evaporation-enhancing permeable pavement, which has capillary columns in aggregate and a liner at the bottom. To explore the efficiency of mitigating the UHI, bench-scale permeable pavement units with capillary columns were developed and compared with conventional permeable pavement. Criteria of capillary capacities of the column, evaporation rates, and surface temperature of the pavements were monitored under simulated rainfall and Shanghai local weather conditions. Results show the capillary column was important in increasing evaporation by lifting water from the bottom to the surface, and the evaporation-enhancing permeable pavement was cooler than a conventional permeable pavement by as much as 9.4°C during the experimental period. Moreover, the cooling effect of the former pavement could persist more than seven days under the condition of no further rainfall. Statistical analysis result reveals that evaporation-enhancing permeable pavement can mitigate the UHI effect significantly more than a conventional permeable pavement.
城市热岛（UHI）效应一直是人类居住的巨大威胁，如何缓解这一问题是几十年来全球关注的焦点。本文针对一种新型透水路面的降温效果进行了研究，这种新型透水路面称为增强蒸发型透水路面，它的骨料中含有毛细柱，底部有衬垫。为了探索缓解 UHI 的效率，开发了具有毛细柱的台架式透水路面单元，并与传统透水路面进行了比较。在模拟降雨和上海当地天气条件下，监测了毛细柱的毛细能力、蒸发率和路面表面温度等标准。结果表明，毛细柱通过将水从底部提升到表面，对增加蒸发非常重要，在实验期间，增强蒸发型透水路面比传统透水路面凉爽多达 9.4°C。此外，在前一种路面条件下，即使没有进一步降雨，其冷却效果也能持续七天以上。统计分析结果表明，增强蒸发型透水路面比传统透水路面更能显著缓解 UHI 效应。
