Identification of Tower-Wake Distortions Using Sonic Anemometer and Lidar Measurements

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dc.contributor.ORCID0000-0002-0990-8133 (Iungo, GV)en_US
dc.contributor.authorMcCaffrey, K.en_US
dc.contributor.authorQuelet, P. T.en_US
dc.contributor.authorChoukulkar, A.en_US
dc.contributor.authorWilczak, J. M.en_US
dc.contributor.authorWolfe, D. E.en_US
dc.contributor.authorOncley, S. P.en_US
dc.contributor.authorAlan Brewer, W.en_US
dc.contributor.authorDebnath, Mithuen_US
dc.contributor.authorAshton, Ryanen_US
dc.contributor.authorIungo, Giacomo V.en_US
dc.contributor.authorLundquist, J. K.en_US
dc.contributor.utdAuthorDebnath, Mithuen_US
dc.contributor.utdAuthorAshton, Ryanen_US
dc.contributor.utdAuthorIungo, Giacomo V.en_US
dc.date.accessioned2018-08-31T15:01:32Z
dc.date.available2018-08-31T15:01:32Z
dc.date.created2017-02-02en_US
dc.date.issued2018-08-31
dc.description.abstractThe eXperimental Planetary boundary layer Instrumentation Assessment (XPIA) field campaign took place in March through May 2015 at the Boulder Atmospheric Observatory, utilizing its 300 m meteorological tower, instrumented with two sonic anemometers mounted on opposite sides of the tower at six heights. This allowed for at least one sonic anemometer at each level to be upstream of the tower at all times and for identification of the times when a sonic anemometer is in the wake of the tower frame. Other instrumentation, including profiling and scanning lidars aided in the identification of the tower wake. Here we compare pairs of sonic anemometers at the same heights to identify the range of directions that are affected by the tower for each of the opposing booms. The mean velocity and turbulent kinetic energy are used to quantify the wake impact on these first-and second-order wind measurements, showing up to a 50 % reduction in wind speed and an order of magnitude increase in turbulent kinetic energy. Comparisons of wind speeds from profiling and scanning lidars confirmed the extent of the tower wake, with the same reduction in wind speed observed in the tower wake, and a speed-up effect around the wake boundaries. Wind direction differences between pairs of sonic anemometers and between sonic anemometers and lidars can also be significant, as the flow is deflected by the tower structure. Comparisons of lengths of averaging intervals showed a decrease in wind speed deficit with longer averages, but the flow deflection remains constant over longer averages. Furthermore, asymmetry exists in the tower effects due to the geometry and placement of the booms on the triangular tower. An analysis of the percentage of observations in the wake that must be removed from 2 min mean wind speed and 20 min turbulent values showed that removing even small portions of the time interval due to wakes impacts these two quantities. However, a vast majority of intervals have no observations in the tower wake, so removing the full 2 or 20 min intervals does not diminish the XPIA dataset. © 2017 Author(s).en_US
dc.description.departmentErik Jonsson School of Engineering and Computer Scienceen_US
dc.identifier.bibliographicCitationMcCaffrey, K., P. T. Quelet, A. Choukulkar, J. M. Wilczak, et al. 2017. "Identification of tower-wake distortions using sonic anemometer and lidar measurements." Atmospheric Measurement Techniques 10(2): 393-407.en_US
dc.identifier.issn1867-1381en_US
dc.identifier.issue2en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6045
dc.identifier.volume10en_US
dc.language.isoenen_US
dc.publisherCopernicus GmbHen_US
dc.relation.urihttp://dx.doi.org/10.5194/amt-10-393-2017en_US
dc.rightsCC BY 3.0 (Attribution)en_US
dc.rights©2017 Authorsen_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.source.journalAtmospheric Measurement Techniquesen_US
dc.subjectAnemometeren_US
dc.subjectBoundary layeren_US
dc.subjectKinetic energyen_US
dc.subjectOptical radaren_US
dc.subjectWinds—Measurementen_US
dc.subjectWind velocityen_US
dc.subjectWinds—Speed—Measurementen_US
dc.subjectWind wavesen_US
dc.subjectWinds—Speeden_US
dc.titleIdentification of Tower-Wake Distortions Using Sonic Anemometer and Lidar Measurementsen_US
dc.type.genrearticleen_US

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Iungo, Giacomo V.