Estimation of LiDAR error over complex terrain covered with forest using numerical tools
Since a few years, a new wind measurement instrument has been competing with standard cup anemometers: the LiDAR. The performances of this instrument over complex terrain are still a matter of debate and this is mainly due to the flow homogeneity assumption made by the instrument. In this work, the...
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Published in | Mechanics & industry : an international journal on mechanical sciences and engineering applications Vol. 15; no. 3; pp. 169 - 174 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Villeurbanne
EDP Sciences
01.01.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Since a few years, a new wind measurement instrument has been competing with standard cup anemometers: the LiDAR. The performances of this instrument over complex terrain are still a matter of debate and this is mainly due to the flow homogeneity assumption made by the instrument. In this work, the error caused by this hypothesis was evaluated with the help of OpenFOAM 1.7, MeteoDyn WT 4.0 and WAsP Engineering for a LiDAR deployed on a complex site covered with dense forest. The assessment of the CFD model firstly revealed the significant impact of both the location and nature of the inlet boundary condition. Despite the presence of terrain complexity within a radius of 340 m around the remote sensor, an averaged error of less than 3% was observed, suggesting that the LiDAR is only affected by topographic variations in the immediate vicinity of the scanned volume.
Depuis quelques années, un nouvel instrument de mesure du vent fait concurrence aux anémomètres à coupoles classiques : le LiDAR. Les performances de cet appareil en terrain complexe sont encore sujettes à discussion principalement à cause de l’hypothèse d’homogénéité de l’écoulement que fait l’appareil. Dans ce travail, l’erreur induite par cette hypothèse a éteé´valuée à l’aide d’OpenFOAM 1.7, MeteoDyn WT 4.0 et WAsP Engineering pour un LiDAR déployé sur site complexe et recouvert de forêt dense. L’évaluation du modèle CFD a d’abord révélé l’importance capitale de la position ainsi que la nature de la condition frontière d’entrée. Malgré la présence de complexité topographique sur un rayon de 340 m autour de l’instrument, une erreur moyenne de moins de 3 % fut observée, ce qui laisse envisager que le LiDAR n’est affecté que par la topographie très près du volume scanné. |
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Bibliography: | PII:S2257777714000256 istex:30D04CF7AEB88A8C990A8A91071EBC18F393231B publisher-ID:mi130156 ark:/67375/80W-S24VFC11-2 |
ISSN: | 2257-7777 2257-7750 |
DOI: | 10.1051/meca/2014025 |