A Note on Spatial Averaging and Shear Stresses Within Urban Canopies
A Note on Spatial Averaging and Shear Stresses Within Urban Canopies
复制标题
关于城市冠层内的空间平均和剪应力的注释
作者：
Zheng;V. Fuka
嵌入中尺度数值模式的一维城市模式可能会在城市冠层内放置几个网格点。这需要对剪切应力（即垂直动量通量）进行精确的参数化，包括这些点处的分散应力和动量汇。我们使用了一个案例研究与填充密度为33%，并严格检查的空间平均总剪应力，它可以用于在一个一维列城市模型的垂直变化。结果表明，不考虑实体部分的体积或面积的内在空间平均比考虑实体部分的体积或面积的综合空间平均产生更大的冠层内总应力的时空平均值和更明显的建筑物顶部的突变。
One-dimensional urban models embedded in mesoscale numerical models may place several grid points within the urban canopy. This requires an accurate parametrization for shear stresses (i.e. vertical momentum fluxes) including the dispersive stress and momentum sinks at these points. We used a case study with a packing density of 33% and checked rigorously the vertical variation of spatially-averaged total shear stress, which can be used in a one-dimensional column urban model. We found that the intrinsic spatial average, in which the volume or area of the solid parts are not included in the average process, yield greater time–spatial average of total stress within the canopy and a more evident abrupt change at the top of the buildings than the comprehensive spatial average, in which the volume or area of the solid parts are included in the average.
影响因子：
4.3
作者：
Castro, Ian P.;Xie, Zheng-Tong;Coceal, O.
通讯作者：
Coceal, O.