Spectral analysis of wind turbulence measured by a Doppler Lidar for velocity fine structure and coherence studies
نویسندگان
چکیده
Turbulence in the Kolmogorov inertial subrange has been measured remotely by a line-averaging range-gated pulsed coherent Doppler Lidar, i.e., a commercially available wind Lidar (Leosphere WindCube WLS7) modified in order to stare horizontally into the approaching turbulent flow at a platform situated at 125 meters height in the meteorology tower at Risø DTU, Denmark. Time series of wind turbulence was recorded by the Lidar as well as by a sonic anemometer mounted on the tower during December 2009 with wind approaching the probing Lidar laser beam from a variety of wind directions providing data for analysis of the influence of Lidar spatial filtering as well as for coherence analysis and studies of the Taylor’s ”Frozen Turbulence hypothesis”.
منابع مشابه
Computer simulation of coherent Doppler lidar measurement of wind velocity and retrieval of turbulent wind statistics
C. Werner DLR Institute of Atmospheric Physics D-82234 Wessling, Germany E-mail: [email protected] Abstract. We describe the algorithms for the simulation of cw and pulsed coherent Doppler wind lidar operation in a turbulent atmosphere and the methods to estimate the mean wind and the parameters of small-scale wind turbulence from lidar data. The algorithms are realized as LabView compute...
متن کاملWind Retrieval Algorithms for the Wind Products of the Airborne Coherent Doppler Lidar
The airborne coherent Doppler lidar could provide the wind velocity relative to the motion of the lidar. The retrieval algorithms are complex corresponding to Ground-based lidar, due to the Doppler shift caused by mobile platform. This article gives a thorough analysis of the wind retrieval algorithms for the wind products of airborne Doppler lidar, include the correction for the lidar velocity...
متن کاملField Measurements of Wind Turbine Wakes with Lidars
Field measurements of the wake flow produced from a 2-MW Enercon E-70 wind turbine were performed using three scanning Doppler wind lidars. A GPS-based technique was used to determine the position of the wind turbine and the wind lidar locations, as well as the direction of the laser beams. The lidars used in this study are characterized by a high spatial resolution of 18 m, which allows the de...
متن کاملMeasurements of Surface-Layer Turbulence in a Wide Norwegian Fjord Using Synchronized Long-Range Doppler Wind Lidars
Three synchronized pulsed Doppler wind lidars were deployed from May 2016 to June 2016 on the shores of a wide Norwegian fjord called Bjørnafjord to study the wind characteristics at the proposed location of a planned bridge. The purpose was to investigate the potential of using lidars to gather information on turbulence characteristics in the middle of a wide fjord. The study includes the anal...
متن کاملOn the accuracy of retrieved wind information from Doppler lidar observations
A single pulsed Doppler lidar was successfully deployed to measure air ow and turbulence over the Malvern hills, Worcester, UK. The DERA Malvern lidar used was a CO2 10.6 1m pulsed Doppler lidar. The lidar pulse repetition rate was 120 Hz and had a pulse duration of 0.6 1s. The system was set up to have 41 range gates with range resolution of 112 m. This gave a theoretical maximum range of ap...
متن کامل