Signature of a Cubical Canopy on the Spatial Dynamics of an Atmospheric Boundary Layer
The present work investigates the influence of the plan density of a cube-based canopy on the coherent structures developing in the roughness sub-layer of an atmospheric boundary layer. Stereo Particle Image Velocimetry is employed using a large field of view in a horizontal plane, so as to identify both the large meandering structures of the boundary layer and the dynamics associated with the wake of the canopy. Pre-multiplied two-dimensional spectra show wall-normal velocity fluctuations are constrained by the pitch of the canopy.
Financial support from the French National Research Agency through research Grant URBANTURB No. ANR-14-CE22-0012-01 is acknowledged.