Preprints
https://doi.org/10.5194/wes-2024-93
https://doi.org/10.5194/wes-2024-93
12 Aug 2024
 | 12 Aug 2024
Status: this preprint is currently under review for the journal WES.

Enhancing turbulent fluctuation measurement with tailored wind lidar profilers

Maxime Thiébaut, Frédéric Delbos, Cristina Benzo, Loïc Mahe, and Florent Guinot

Abstract. This study separately investigates the impact of an enhanced sampling rate and reduced probe length on turbulent measurements using the Vaisala WindCube v2.1 lidar profiler, in comparison to the commercially configured WindCube v2.1. In the first experiment, a tailored lidar sampled four times faster than the standard setup. In the second experiment, a tailored lidar employed a 15 m probe length, compared to the commercial configuration’s 23 m. The study offers a detailed analysis of how these changes affect various aspects of wind measurement, including mean wind speed, standard deviation, velocity spectra, noise level, integral length scale, and dissipation rate. Increasing the sampling rate improves turbulence measurement without affecting mean wind speed measurement. However, a slight reduction in data availability was observed compared to the commercial configuration. Reducing the probe length results in higher standard deviation values compared to the commercial configuration, but this comes at the expense of increased noise levels, making it unclear whether the higher standard deviations are due to the energy of smaller eddies or noise. Additionally, the reduced probe length configuration exhibited a high bias in mean wind speed measurement and had a limited impact on other turbulence metrics. These findings suggest that the best improvement for turbulence measurement with the WindCube lidar profiler is achieved through an increased sampling rate.

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Maxime Thiébaut, Frédéric Delbos, Cristina Benzo, Loïc Mahe, and Florent Guinot

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2024-93', Anonymous Referee #1, 19 Aug 2024
  • RC2: 'Comment on wes-2024-93', Anonymous Referee #2, 06 Nov 2024
Maxime Thiébaut, Frédéric Delbos, Cristina Benzo, Loïc Mahe, and Florent Guinot
Maxime Thiébaut, Frédéric Delbos, Cristina Benzo, Loïc Mahe, and Florent Guinot

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Short summary
This paper explores potential technical enhancements to wind lidar profilers for improved turbulence measurement. The study separately tests the effects of increased sampling rate and reduced probe length against a commercial lidar of the same type. Various turbulence metrics were quantified to evaluate the impact of these technical modifications. The results indicate that increasing the sampling rate is the most valuable enhancement for turbulence measurement.
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