Friction velocity estimation from the Reynold stress tensor

バージョン 1.4 (923 KB) 作成者: E. Cheynet
The friction velocity is computed from sonic anemometer data without the need to correct tilt angle errors

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更新 2020/5/2

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The friction velocity is computed using a Matlab implementation of the method proposed by Klipp [1]. This method has the advantage to avoid the correction of instrument tilt by using the Reynolds stress tensor invariants. In [1], the friction velocity calculated for neutral conditions is found to be in good agreement with the standard method. Larger discrepancies are expected for non-neutral conditions or low wind speeds but produce a dimensionless shear that scales well with the non-dimensional Obukhov length. Type of application: Micrometeorology, surface layer turbulence.


The present Matlab submission contains:

  • A function "frictionVelocity.m", which computes the friction velocity using the standard method or the one proposed in [1]. The latter method is more appropriate in complex terrain and a neutral atmosphere.
  • An example file "Example1.mlx" that compares the 2 methods
  • A data file "data.mat" that contains simulated wind turbulent velocity records


[1] Klipp, C. (2018). Turbulent friction velocity calculated from the Reynolds stress tensor. Journal of the Atmospheric Sciences, (2018).


E. Cheynet (2022). Friction velocity estimation from the Reynold stress tensor (, GitHub. 取得済み .

E. Cheynet. ECheynet/Klipp2018 v1.4. Zenodo, 2020, doi:10.5281/ZENODO.3782792.

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作成: R2019b
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