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Analyses of Spatial Correlation and Coherence in ABL Flow with a Fleet of UAS

Wetz, Tamino and Zink, Josef and Bange, Jens and Wildmann, Norman (2023) Analyses of Spatial Correlation and Coherence in ABL Flow with a Fleet of UAS. Boundary-Layer Meteorology, pp. 1-29. Springer. doi: 10.1007/s10546-023-00791-4. ISSN 0006-8314.

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Official URL: https://doi.org/10.1007/s10546-023-00791-4


The spatial structures of turbulent flow in the atmospheric boundary layer (ABL) are complex and diverse. Multi-point spatial correlation measurements can help improve our understanding of these structures and their statistics. In this context, we investigate Taylor’s hypothesis and the statistics of spatial structures on the microscale. For the first time, simultaneous horizontally distributed wind measurements with a fleet of 20 quadrotor UAS (unmanned aerial systems) are realized. The measurements were taken at different heights and under different atmospheric conditions at the boundary layer field site in Falkenberg of the German Meteorological Service (DWD). A horizontal flight pattern has been specifically developed, consisting of measurements distributed along and lateral to the mean flow direction with separation distances of 5 ... 205 m. The validity of Taylor’s hypothesis is studied by examining the cross-correlations of longitudinally distributed UAS and comparing them with the auto-correlations of single UAS. To assess the similarity of flow structures on different scales, the lateral and longitudinal coherence of the streamwise velocity component is examined. Two modeling approaches for the decay of coherence are compared. The experimental results are in good agreement with the model approaches for neutral atmospheric conditions, whereas in stable and convective ABL, the exponential approaches are not unconditionally valid. The validation results and the agreement with the literature on coherence in the ABL underline the potential of the UAS fleet for the purpose of spatial turbulence measurements.

Item URL in elib:https://elib.dlr.de/194726/
Document Type:Article
Title:Analyses of Spatial Correlation and Coherence in ABL Flow with a Fleet of UAS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bange, JensUniverstät Tübingenhttps://orcid.org/0000-0003-4075-1573UNSPECIFIED
Wildmann, NormanDLR, IPAhttps://orcid.org/0000-0001-9475-4206UNSPECIFIED
Date:5 April 2023
Journal or Publication Title:Boundary-Layer Meteorology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-29
Keywords:Coherence, Spatial correlation, Taylor’s hypothesis, Turbulence, UAS
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Wetz, Tamino
Deposited On:18 Apr 2023 14:04
Last Modified:19 Apr 2023 13:50

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