Fields of Lagrangian (\(T^{L}\)) and Eulerian (\(T^{E}\)) time scales of the turbulence within a regular array of two-dimensional obstacles of unit aspect ratio have been determined by means of a water-channel experiment reproducing the atmospheric boundary layer in neutral conditions. It has been found that there is a strong spatial inhomogeneity both of the scales and of their ratio, \(\beta = T^{L} /T^{E}\). The results can provide useful information on numerical modelling of tracer dispersion in urban areas.

中文翻译：

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关于二维障碍物阵列内湍流的拉格朗日和欧拉时间尺度

单位纵横比的二维障碍物规则阵列内湍流的拉格朗日场（\(T^{L}\)）和欧拉场（\(T^{E}\) ）时间尺度已通过以下方式确定在中性条件下再现大气边界层的水道实验。已经发现，尺度及其比率\(\beta = T^{L} /T^{E}\)都存在很强的空间不均匀性。该结果可以为城市地区示踪剂扩散的数值建模提供有用的信息。