Mathematics – Dynamical Systems
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3105102p&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 5, CiteID L05102
Mathematics
Dynamical Systems
7
Meteorology And Atmospheric Dynamics: Turbulence, Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Hydrology: Stochastic Processes, Hydrology: Instruments And Techniques
Scientific paper
Two characteristics that distinguish canopy sublayer (CSL) turbulence from its atmospheric surface layer (ASL) counterpart are short-circuiting of the energy cascade and formation of Kelvin-Helmholtz (KH) vortices near the canopy top. These two phenomena lead to nonlinear and poorly understood interactions between small and large scale eddies within the CSL absent from classical ASL turbulence. Using velocity scaling arguments and nonlinear time series analysis, we explore the degree of interaction between large and small scales in a canopy composed of densely arrayed cylinders. We found that such interactions are dynamically divided into four regions depending on the distance from the wall, and posses various degrees of nonlinearity and interaction strengths. The broader impact to CSL Large Eddy Simulations (LES) and low-dimensional dynamical systems (LDDS) models of coherent eddies is briefly discussed.
Albertson John D.
Katul Gabriel G.
Poggi D.
Porporato Amilcare
Ridolfi Luca
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