Boundary-Layer Meteorology

, Volume 130, Issue 3, pp 423–435 | Cite as

A Note on Two-Equation Closure Modelling of Canopy Flow



The note presents a rational approach to modelling the source/sink due to vegetation or buoyancy effects that appear in the turbulent kinetic energy, E, equation and a supplementary equation for a length-scale determining variable, φ, when two-equation closure is applied to canopy and atmospheric boundary-layer flows. The approach implements only standard model coefficients Cφ1 and Cφ2 in the production and destruction terms of the φ equation, respectively. Numerical tests illustrate the practical applicability of the method, where, for example, simulations with the Eω model (where \({\varphi=\omega=\varepsilon/E}\) is the specific dissipation and \({\varepsilon}\) is the dissipation rate of E) properly reproduce both the surface-layer wind profile estimated from the Monin-Obukhov similarity theory and the mixing-height evolution observed above forested terrain in Southern Finland.


Atmospheric boundary layer Canopy flow Non-neutral stratification Two-equation models Turbulence closure 


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© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Wind Energy DivisionRisø National Laboratory for Sustainable Energy, Technical University of DenmarkRoskildeDenmark

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