Speaker
Description
This study presents one of the first validations of horizontal turbulence co-coherence estimated using dual synchronised long-range pulsed Doppler wind lidars, with sonic anemometers as reference. The experiment was conducted in March 2020, where two WindCube 100S lidars operated in fixed line-of-sight mode with parallel beams directed towards two 3D sonic anemometers mounted on 10 m-high masts separated by 20 m. One-point turbulence statistics show good agreement, with $R^2 > 0.96$ for the mean along-beam velocity and $R^2 \approx 0.87$--$0.93$ for its standard deviation. The co-coherence of the along-beam velocity was evaluated using 27 high-quality 50-minute time series under northerly flow conditions, complemented by 46 samples under more turbulent southerly flow. The lidar-derived co-coherence agrees closely with the sonic reference when measurement noise is low. However, measurement noise in one lidar leads to a systematic underestimation of co-coherence across all frequencies. These results show that dual-pulsed scanning Doppler wind lidars can reliably measure turbulence co-coherence, provided that beam alignment is accurate and measurement noise is low. Under the present near-optimal conditions, with lidar–mast distances below 150 m and verified alignment, dual-lidar systems provide a practical alternative to offshore masts for studying horizontal turbulence coherence.
| Topic Area | Wind Engineering and Industrial Aerodynamics |
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