Interaction between large and small scales in the canopy sublayer

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Read Full Article (file size: 509300 bytes) Cited by GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L05102, doi:10.1029/2003GL018611, 2004 Interaction between large and small scales in the canopy sublayer D. Poggi Dipartimento di Idraulica, Trasporti ed Infrastrutture Civili, Politecnico di Torino, Torino, Italy Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina, USA Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, USA A. Porporato Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina, USA L. Ridolfi Dipartimento di Idraulica, Trasporti ed Infrastrutture Civili, Politecnico di Torino, Torino, Italy J. D. Albertson Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina, USA Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, USA G. G. Katul Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, Durham, North Carolina, USA Nicholas School of the Environment and Earth Sciences, Duke University, Durham, North Carolina, USA Abstract 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. Received 11 September 2003; accepted 22 January 2004; published 2 March 2004. Index Terms: 3379 Meteorology and Atmospheric Dynamics: Turbulence; 0315 Atmospheric Composition and Structure: Biosphere/atmosphere interactions; 1869 Hydrology: Stochastic processes; 1894 Hydrology: Instruments and techniques. Read Full Article (file size: 509300 bytes) Cited by Citation: Poggi, D., A. Porporato, L. Ridolfi, J. D. Albertson, and G. G. Katul (2004), Interaction between large and small scales in the canopy sublayer, Geophys. Res. Lett., 31, L05102, doi:10.1029/2003GL018611. Copyright 2004 by the American Geophysical Union.

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