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Turbulent dispersion from an elevated line source: measurements of wind-concentration moments and budgets

Published online by Cambridge University Press:  20 April 2006

M. R. Raupach  and
B. J. Legg
M. R. Raupach
Affiliation:
CSIRO Division of Environmental Mechanics, GPO Box 821, Canberra, ACT 2601, Australia
B. J. Legg
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts, U.K.
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Abstract

Wind and tracer-concentration fluctuations, and hence the budgets for tracer variance, vertical flux and streamwise flux, have been measured in the dispersing plume from an elevated lateral line source in an equilibrium turbulent surface layer, using heat as a passive tracer. The results are analysed by testing closure assumptions for models of turbulent dispersion at first and second order. Except close to the source, a first-order (gradient-diffusion) model satisfactorily predicts both the vertical and streamwise tracer fluxes.

The tracer-variance budget is essentially a balance between advection and dissipation, with production becoming significant as fetch increases. The vertical and streamwise heat-flux budgets have advection and turbulent-transport terms which are in balance (almost exactly for the vertical flux, only approximately for the streamwise flux), leaving balances between local production and pressure-gradient interaction. The turbulence-interaction component of the pressure term cannot be modelled as $-\overline{u^{\prime}_{i}\theta^{\prime}}/\tau, \overline{u^{\prime}_{i}\theta^{\prime}}$ being the flux vector and τ a scalar timescale.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 136 , November 1983 , pp. 111 - 137
Copyright
© 1983 Cambridge University Press

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