30 Jun 1995
30 Jun 1995
Flux-gradient relationship for turbulent dispersion over complex terrain
F. Tampieri2, U. Giostra1,2, F. Trombetti1, D. Anfossi3, E. Ferrero4, and G. Tinarelli5
F. Tampieri et al.
F. Tampieri2, U. Giostra1,2, F. Trombetti1, D. Anfossi3, E. Ferrero4, and G. Tinarelli5
- 1Istituto FISBAT/CNR, Via Gobetti 101, 40129 Bologna, Italy
- 2Istituto ISIATA/CNR, Strada per Arnesano, 73100 Lecce, Italy
- 3Istituto ICG/CNR, corso Fiume 4, 10133 Torino, Italy
- 4Dip. Scienze e tec. Avanz., Universitá di Alessandria, Corso Borsalino 54, 15100 Alessandria, Italy
- 5ENEL/CRAM, Servizio Ambiente, Via Rubattino 54, 20134 Milano, Italy
- 1Istituto FISBAT/CNR, Via Gobetti 101, 40129 Bologna, Italy
- 2Istituto ISIATA/CNR, Strada per Arnesano, 73100 Lecce, Italy
- 3Istituto ICG/CNR, corso Fiume 4, 10133 Torino, Italy
- 4Dip. Scienze e tec. Avanz., Universitá di Alessandria, Corso Borsalino 54, 15100 Alessandria, Italy
- 5ENEL/CRAM, Servizio Ambiente, Via Rubattino 54, 20134 Milano, Italy
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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.