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A Note on Spatial Averaging and Shear Stresses Within Urban Canopies
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2017-11-23 , DOI: 10.1007/s10546-017-0321-7
Zheng-Tong Xie 1 , Vladimir Fuka 1
Affiliation  

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.

中文翻译:

关于城市檐篷内空间平均和剪应力的注释

嵌入在中尺度数值模型中的一维城市模型可能会在城市冠层内放置多个网格点。这需要对剪切应力(即垂直动量通量)进行准确的参数化,包括这些点处的色散应力和动量汇。我们使用了一个填充密度为 33% 的案例研究,并严格检查了空间平均总剪应力的垂直变化,可用于一维柱式城市模型。我们发现固有空间平均,其中实体部分的体积或面积不包括在平均过程中,在冠层内产生更大的总应力的时间-空间平均和建筑物顶部的更明显的突变比综合空间平均,其中实体部分的体积或面积包括在平均中。
更新日期:2017-11-23
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