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Friction velocity estimate from the Reynolds stress tensor

version 1.1 (919 KB) by E. Cheynet
The friction velocity is computed without the need to correct tilt angle errors

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Updated 03 Mar 2019

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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 "Example.m" that compares the 2 methods
- A data file "data.mat" that contains simulated wind turbulent velocity records
The method proposed in [1] 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 found for non-neutral conditions but produce a dimensionless shear that scales well with the non-dimensional Obukhov length.
All credit goes to [1] for the proposed method. I have only written the Matlab code from the description of the method provided in the paper.
[1] Klipp, C. (2018). Turbulent friction velocity calculated from the Reynolds stress tensor. Journal of the Atmospheric Sciences, (2018).

Cite As

E. Cheynet (2019). Friction velocity estimate from the Reynolds stress tensor (https://www.mathworks.com/matlabcentral/fileexchange/66015-friction-velocity-estimate-from-the-reynolds-stress-tensor), MATLAB Central File Exchange. Retrieved .

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Typo in Example.m

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MATLAB Release Compatibility
Created with R2014b
Compatible with any release
Platform Compatibility
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