Estimating the turbulent energy dissipation rate in an airport environment |
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Authors: | Michael Frech |
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Institution: | 1.Institut für Physik der Atmosph?re,DLR Oberpfaffenhofen,Wessling,Germany |
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Abstract: | This note reports on the influence of aircraft wake vortices on the estimation of the turbulent energy dissipation rate using
sonic anemometer measurements near the runway threshold. The wake vortex traces, which are generated at a height of about
65 m and subsequently evolve in ground effect, are clearly visible in the velocity components and temperature. The observed
temperature increase of 1 K appears related to the stably stratified atmospheric surface layer. The dissipation rate is estimated
from the longitudinal velocity power spectrum for a sample in a nocturnal boundary layer with and without a wake vortex signal.
In both cases an inertial subrange is found. For the analyzed sample the estimated dissipation rate is a factor of ten larger
compared to the undisturbed sample. Implications for operational wake avoidance systems are discussed. |
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Keywords: | Airport Sonic anemometer Turbulent energy dissipation rate Wake vortex |
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