File Exchange

image thumbnail

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


Updated 03 Mar 2019

View License

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 (, MATLAB Central File Exchange. Retrieved .

Comments and Ratings (0)



Added the project website


Summary updated

Typo in Example.m


MATLAB Release Compatibility
Created with R2014b
Compatible with any release
Platform Compatibility
Windows macOS Linux