周晓宇. 2018. 冷却屋顶对北京城市热环境影响的模拟研究[J]. 气象学报, (0):-, doi:10.11676/qxxb2018.045
冷却屋顶对北京城市热环境影响的模拟研究
Simulation study on the influence of cooling roof on thermal environment in Beijing
投稿时间:2017-11-22  修订日期:2018-03-26
DOI:10.11676/qxxb2018.045
中文关键词:  高反照率屋顶,绿色屋顶,城市热岛缓解,WRF模式
英文关键词:high reflective roof, green roof, urban heat island mitigation, WRF model
基金项目:国家自然科学基金
作者单位E-mail
周晓宇 云南大学资源环境与地球科学学院 245144672@qq.com 
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中文摘要:
      两种类型冷却屋顶(高反照率屋顶、绿色屋顶)的研究对于北京夏季城市高温的缓解作用具有重要的意义。耦合单层城市冠层模型(SLUCM)与天气研究与预报(WRF3.8)模式,采用北京市及其外围地区158个站点气象资料评估模式控制案例(case1)的模拟性能,并选取7组不同反照率屋顶算例(case2-4)和不同覆盖比例的绿色屋顶算例(case5-8)进行敏感性实验。研究结果表明:(1)在北京城市区域,高反照率屋顶为0.85(case4)比绿色屋顶占比100%(case8)具有更好的降温效果,case4三天平均降温可达到0.90oC,而case8降温为0.46oC。(2)屋顶反照率每增加0.1,会导致北京城市区域最高气温降低0.27oC;绿色屋顶比例的增加也会导致温度的降低,每增加10%,最高气温降低0.16oC。(3)两种冷却屋顶对城市热岛也存在显著的影响,在白天13:00-14:00时刻,case4与case1对比的城市热岛(UHI)降温最大差值为1.47oC,比case8的UHI降温更加明显。(4)在城市区域垂直高度上,冷却屋顶的降温作用可达到1.2km,同时湍流运动存在明显的减弱;在三天12:00-18:00时刻,case4、case8与case1对比,边界层高度平均降低了669m、430m。
英文摘要:
      Abstract According to the differences between climate background and urban pattern, different kinds of cool roof(like high reflectivity roofs and green roofs)have different cooling effects. Under the background of summer high temperature and heat wave in Beijing ,this paper has combined the Weather Forecasting and Forecasting Model 3.8(WRF3.8) with the Single-Layer City Canopy Model (SLUCM) and set different albedo roof cases (case 2-4) and different cover ratios of green roof cases (case5-8) to compare with control case(case 1). The results of the study showed that: (1) In the urban area of Beijing, the roof which albedo is 0.85 (case4) has a better cooling effect than 100% (case8) green roof, the average temperature of case4 drops 0.9℃ and in the meantime the cooling of the case8 is 0.46℃; (2) With the albedo of the roof increases by 0.1, that the maximum temperature in Beijing will decrease 0.27℃. And the increase of the proportion of green roofs will also result in a decrease in temperature. With each increase by 10%, the maximum temperature will decrease by 0.16℃; (3) There is significant impact on urban heat islands that caused by cooling roofs. Compared with case 1, the maximum UHI of case 4 drops by 1.47℃ during the daytime from 13:00 to 14:00, which is higher than the cooling effect of case8; (4) The cooling effect of the cooling roof can reach the height of 1.2km above the city, and the turbulence movement is also significantly reduced. At the 12:00-18:00 of the three days, compared with case 1, the height of the boundary layer of case 4 and case 8 are respectively average reduced by 669m, 430m.
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