反射路面对城市峡谷反射率的影响

发布时间：2018-02-28 22:14

本文关键词： 纵横比反射路面邻近建筑物城市峡谷反射率　出处：《土木建筑与环境工程》2016年03期 　论文类型：期刊论文

【摘要】：太阳辐射在城市峡谷内形成多重反射,加剧城市热岛效应。峡谷太阳辐射吸收量与城市结构、墙体和路面反射率及时间显著相关。建立城市峡谷反射率数值模型,评估提高路面反射率能否有效提高城市峡谷反射率,并探讨反射路面对邻近建筑墙体的反射与散射辐射的影响。通过现场观测数据验证数值模型的可靠性。研究结果表明:建筑物高度与路面宽度之比(纵横比)是城市峡谷反射率最关键的影响因素,当峡谷纵横比1.0时,路面反射作用较为明显;而且,相对于冬季,夏季时峡谷内反射路面能向邻近建筑物反射更多的额外散射辐射,而峡谷走向对额外散射辐射的影响较小。当峡谷纵横比1.0时,建议采用反射路面缓解城市热岛。
[Abstract]:Solar radiation forms multiple reflections in urban canyons, exacerbating urban heat island effect. Solar radiation absorption in canyons is significantly related to urban structure, reflectivity of wall and pavement, and time. A numerical model of urban canyon reflectivity is established. To evaluate whether increasing road surface reflectivity can effectively improve urban canyon reflectivity, The effect of reflection and scattering radiation on the wall of adjacent buildings is discussed. The reliability of the numerical model is verified by field observation data. The results show that the ratio of height to width of the building (aspect ratio) is the ratio of the height of the building to the width of the pavement. The most critical factor in urban canyon reflectivity, When the aspect ratio of the canyon is 1.0, the road surface reflection is more obvious. Moreover, compared with winter, the reflection surface in the canyon can reflect more additional radiation to the adjacent buildings in summer. When the aspect ratio of the canyon is 1.0, it is suggested that the reflection road should be used to alleviate the urban heat island.
【作者单位】：广西大学土木建筑工程学院;广西防灾减灾与工程安全重点实验室;
【基金】：国家自然科学基金(51478126)~~
【分类号】：X16;TU14

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