Shear and Turbulence Effects on Lidar Measurements

Michael Courtney, Ameya Sathe, Nicolai Gayle Nygaard

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Abstract

Wind lidars are now used extensively for wind resource measurements. It is known that lidar wind speed measure-ments are affected by both turbulence and wind shear. This report explains the mechanisms behind these sensitivities. For turbulence, it is found that errors in the scalar mean speed are usually only small. However, particularly in re-spect of a lidar calibration procedure, turbulence induced errors in the cup anemometer speed are seen to be signifi-cantly larger.
Wind shear is shown to induce measurement errors both due to possible imperfections in the lidar sensing height and due to the averaging of a non-linear speed profile. Both effects in combination have to be included when modelling the lidar error. Attempts to evaluate the lidar error from ex-perimental data have not been successful probably due to a lack of detailed knowledge of both the wind shear and the actual lidar sensing weighting functions.
Original languageEnglish
PublisherDTU Wind Energy
Number of pages30
ISBN (Electronic)978-87-93278-01-1
Publication statusPublished - 2014
SeriesDTU Wind Energy E
Number0061

Bibliographical note

This is a revised version of the original report, incorporating comments from the reviewers

Keywords

  • DTU Wind Energy E-0061
  • DTU Wind Energy E-61

Cite this

Courtney, M., Sathe, A., & Gayle Nygaard, N. (2014). Shear and Turbulence Effects on Lidar Measurements. DTU Wind Energy. DTU Wind Energy E, No. 0061