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| Titel |
Structure function analysis and intermittency in the atmospheric boundary layer |
| VerfasserIn |
J. M. Vindel, C. Yagüe, J. M. Redondo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 6 ; Nr. 15, no. 6 (2008-11-27), S.915-929 |
| Datensatznummer |
250012808
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| Publikation (Nr.) |
 copernicus.org/npg-15-915-2008.pdf |
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| Zusammenfassung |
Data from the SABLES98 experimental campaign (Cuxart et al., 2000) have been used
in order to study the relationship of the probability distribution of
velocity increments (PDFs) to the scale and the degree of stability. This
connection is demonstrated by means of the velocity structure functions and
the PDFs of the velocity increments.
Using the hypothesis of local similarity, so that the third order structure
function scaling exponent is one, the inertial range in the Kolmogorov sense
has been identified for different conditions, obtaining the velocity
structure function scaling exponents for several orders. The degree of
intermittency in the energy cascade is measured through these exponents and
compared with the forcing intermittency revealed through the evolution of
flatness with scale.
The role of non-homogeneity in the turbulence structure is further analysed
using Extended Self Similarity (ESS). A criterion to identify the inertial
range and to show the scale independence of the relative exponents is
described. Finally, using least-squares fits, the values of some parameters
have been obtained which are able to characterize intermittency according to
different models. |
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