On the coherence in the boundary layer: Development of a Canopy Interface Model

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Abstract

© 2017 Mauree, Blond, Kohler and Clappier. A 1D Canopy Interface Model (CIM) is developed to act as an interface between a meso-scale and a micro-scale atmospheric model and to better resolve the surface turbulent fluxes in the urban canopy layer. A new discretisation is proposed to solve the TKE equation finding solutions that remain fully concordant with the surface layer theories developed for neutral flows over flat surfaces. A correction is added in the buoyancy term of the TKEequation to improve consistency with the Monin-Obukhov surface layer theory. Obstacles of varying heights and dimensions are taken into account by introducing specific terms in the equations and by modifying the mixing length formulation in the canopy layer. The results produced by CIMare then compared with wind and TKE profiles simulated with a LESexperiment and results obtained during the BUBBLEmeteorological intensive observation campaign. It is shown that the CIM computations are in good agreement with the results simulated by the LES as well as the measurements from BUBBLE. The applicability of the correction term in an urban canopy layer and to further validate CIMin multiple stability conditions and various urban configurations is discussed.

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Mauree, D., Blond, N., Kohler, M., & Clappier, A. (2017). On the coherence in the boundary layer: Development of a Canopy Interface Model. Frontiers in Earth Science, 4. https://doi.org/10.3389/feart.2016.00109

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