The role of radiative-convective interaction in creating the microclimate of urban street canyons
The role of radiative-convective interaction in creating the microclimate of urban street canyons
复制标题
辐射对流相互作用在创造城市街道峡谷小气候中的作用
DOI：
10.1007/bf00708965
复制
发表时间：
1993
影响因子：
4.3
通讯作者：
H. Swaid
中科院分区：
文献类型：
--
作者：
H. Swaid
已经开发出近似天空视野系数（SVF），它能够估计城市街道峡谷的净长波辐射能损失的平均率。在室外测试中使用了典型峡谷几何形状的缩小比例模型，以验证使用所提出的 SVF 获得的辐射通量的预测。比例模型中的空气-表面温度差异与假设的峡谷内气流模式一起使用，以确定峡谷中风场的一些定量特征。一方面，针对峡谷内平均流速和行人水平流速与环境（屋顶水平以上）风速之间的关系，提出了简单的相关性。正如预期的那样，峡谷的高宽比控制着峡谷内水流的形式和大小。
An approximate sky view factor (SVF) has been developed, which is capable of estimating the mean rate of net longwave radiant energy loss from urban street canyons. Reduced scale models of typical canyon geometries were used in outdoor tests to verify the predictions of radiant fluxes obtained using the proposed SVF.Air-surface temperature differences from the scale models are used together with hypothesized within-canyon airflow patterns to determine some quantitative characteristics of the wind field in canyons. Simple correlations are proposed for the relationship between mean in-canyon and pedestrian-level flow speeds on the one hand, and the ambient (above roof-level) wind speed on the other hand. As expected, the height/width ratio of a canyon controls the form and magnitude of the flow within.