Assessment of Surface-Layer Coherent Structure Detection in Dual-Doppler Lidar Data Based on Virtual Measurements

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dc.identifier.uri Stawiarski, Christina Träumner, Katja Kottmeier, Christoph Knigge, Christoph Raasch, Siegfried 2016-12-16T09:16:39Z 2016-12-16T09:16:39Z 2015
dc.identifier.citation Stawiarski, C.; Träumner, K.; Kottmeier, C.; Knigge, C.; Raasch, S.: Assessment of Surface-Layer Coherent Structure Detection in Dual-Doppler Lidar Data Based on Virtual Measurements. In: Boundary-Layer Meteorology 156 (2015), Nr. 3, S. 371-393. DOI:
dc.description.abstract Dual-Doppler lidar has become a useful tool to investigate the wind-field structure in two-dimensional planes. However, lidar pulse width and scan duration entail significant and complex averaging in the resulting retrieved wind-field components. The effects of these processes on the wind-field structure remain difficult to investigate with in situ measurements. Based on high resolution large-eddy simulation (LES) data for the surface layer, we performed virtual dual-Doppler lidar measurements and two-dimensional data retrievals. Applying common techniques (integral length scale computation, wavelet analysis, two-dimensional clustering of low-speed streaks) to detect and quantify the length scales of the occurring coherent structures in both the LES and the virtual lidar wind fields, we found that, (i) dual-Doppler lidar measurements overestimate the correlation length due to inherent averaging processes, (ii) the wavelet analysis of lidar data produces reliable results, provided the length scales exceed a lower threshold as a function of the lidar resolution, and (iii) the low-speed streak clusters are too small to be detected directly by the dual-Doppler lidar. Furthermore, we developed and tested a method to correct the integral scale overestimation that, in addition to the dual-Doppler lidar, only requires high-resolution wind-speed variance measurements, e.g. at a tower or energy balance station. eng
dc.description.sponsorship DFG/RA 617/19-2
dc.language.iso eng
dc.publisher Berlin : Kluwer Academic Publishers
dc.relation.ispartofseries Boundary-Layer Meteorology 156 (2015), Nr. 3
dc.rights CC BY 4.0
dc.subject Coherent structures eng
dc.subject Dual Doppler eng
dc.subject Large-eddy simulation eng
dc.subject Lidar eng
dc.subject Doppler effect eng
dc.subject Large eddy simulation eng
dc.subject Wavelet analysis eng
dc.subject Wind eng
dc.subject Coherent structure eng
dc.subject Correlation lengths eng
dc.subject Dual-Doppler-lidar eng
dc.subject In-situ measurement eng
dc.subject Reliable results eng
dc.subject Two dimensional plane eng
dc.subject Virtual measurements eng
dc.subject Optical radar eng
dc.subject boundary layer eng
dc.subject Doppler lidar eng
dc.subject surface layer eng
dc.subject wind velocity eng
dc.subject.ddc 530 | Physik ger
dc.title Assessment of Surface-Layer Coherent Structure Detection in Dual-Doppler Lidar Data Based on Virtual Measurements
dc.type article
dc.type Text
dc.relation.issn 00068314
dc.bibliographicCitation.issue 3
dc.bibliographicCitation.volume 156
dc.bibliographicCitation.firstPage 371
dc.bibliographicCitation.lastPage 393
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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