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| Titel |
A six-beam method to measure turbulence statistics using ground-based wind lidars |
| VerfasserIn |
A. Sathe, J. Mann, N. Vasiljevic, G. Lea |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-12), S.729-740 |
| Datensatznummer |
250116131
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| Publikation (Nr.) |
 copernicus.org/amt-8-729-2015.pdf |
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| Zusammenfassung |
| A so-called six-beam method is proposed to measure atmospheric turbulence
using a ground-based wind lidar. This method requires measurement of the
radial velocity variances at five equally spaced azimuth angles on the base
of a scanning cone and one measurement at the centre of the scanning circle,
i.e.using a vertical beam at the same height. The scanning configuration is
optimized to minimize the sum of the random errors in the measurement of the
second-order moments of the components (u,v, w) of the wind field. We
present this method as an alternative to the so-called velocity azimuth
display (VAD) method that is routinely used in commercial wind lidars, and
which usually results in significant averaging effects of measured
turbulence. In the VAD method, the high frequency radial velocity
measurements are used instead of their variances. The measurements are
performed using a pulsed lidar (WindScanner), and the derived turbulence
statistics (using both methods) such as the u and v variances are
compared with those obtained from a reference cup anemometer and a wind vane
at 89 m height under different atmospheric stabilities. The
measurements show that in comparison to the reference cup anemometer,
depending on the atmospheric stability and the wind field component, the
six-beam method measures between 85 and 101% of the reference
turbulence, whereas the VAD method measures between 66 and 87% of the
reference turbulence. |
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