Deriving atmospheric turbulence intensity from profiling pulsed lidar measurements
- 1France Énergies Marines, Technopôle Brest-Iroise, 525 Avenue Alexis de Rochon, 29280 Plouzané, France
- 2Vaisala France SAS, 6A, rue René Razel, Tech Park, CS 70001, 91400 Saclay Cedex, France
- 3GL Garrad Hassan Deutschland GmbH, Loads & Power Performance & Wind Resource (E-NX-RL), Sommerdeich 14b, 25709 Kaiser-Wilhelm-Koog, Germany
- 1France Énergies Marines, Technopôle Brest-Iroise, 525 Avenue Alexis de Rochon, 29280 Plouzané, France
- 2Vaisala France SAS, 6A, rue René Razel, Tech Park, CS 70001, 91400 Saclay Cedex, France
- 3GL Garrad Hassan Deutschland GmbH, Loads & Power Performance & Wind Resource (E-NX-RL), Sommerdeich 14b, 25709 Kaiser-Wilhelm-Koog, Germany
Abstract. A new method is proposed to provide estimates of the turbulence intensity (TI) from measurements of pulsed lidars (light detection and ranging) employing the Doppler beam swinging technique. This method relies on combining the variances of the line-of-sight (LOS) velocities collected by the five independent beams of the lidars and, as such, is referred to as the variance method. The variance method comes with an explicit removal of the Doppler noise (inherent to the instrument) to the variance of the LOS velocities. Turbulence metrics derived from the variance method are compared to that derived from a standard method, commonly used in the wind energy industry. Reference turbulence measurements are provided by a sonic anemometer mounted on a meteorological mast, installed nearby the lidars. Two configurations of the WindCube v2.1 lidars are proposed: the commercial configuration and a prototype configuration, sampling 4 times faster, thus allowing to capture the turbulent energy of smaller eddies. The standard method applied on wind measurements collected by both configurations shows mean errors in TI estimates of more than 50 %. The application of the variance method on measurements collected by the commercial and prototype configuration drops the mean error to 16.7 % and 13.2 % respectively.
Maxime Thiébaut et al.
Status: open (until 21 Aug 2022)
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RC1: 'Comment on wes-2022-53', Etienne Cheynet, 21 Jul 2022
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RC2: 'Comment on wes-2022-53', Anonymous Referee #2, 09 Aug 2022
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The comment was uploaded in the form of a supplement: https://wes.copernicus.org/preprints/wes-2022-53/wes-2022-53-RC2-supplement.pdf
Maxime Thiébaut et al.
Maxime Thiébaut et al.
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