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| Titel |
Flux-gradient relationship for turbulent dispersion over complex terrain |
| VerfasserIn |
F. Tampieri, U. Giostra, F. Trombetti, D. Anfossi, E. Ferrero, G. Tinarelli |
| 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 ; 2, no. 2 ; Nr. 2, no. 2, S.89-100 |
| Datensatznummer |
250000477
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| Publikation (Nr.) |
 copernicus.org/npg-2-89-1995.pdf |
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| Zusammenfassung |
| The transfer of a passive tracer in inhomogeneous turbulent
flow is investigated. Starting from Lumley's constitutive equation, we derived an
expression for the ratio between the effective eddy diffusivity K and eddy diffusivity
K
as a function of three length scales characterizing the local turbulence structure, flux
variations and turbulence inhomogeneities. The theoretical predictions for the
one-dimensional case of inhomogeneous symmetric turbulence were validated through a
comparison with the numerical results of a Lagrangian particle model simulating a wind
tunnel experiment of dispersion in the lee of an idealized two-dimensional hill. A
qualitative agreement is reached between the theoretical evaluation of K and the value
obtained from the numerical simulation. |
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