An automatic methodology for estimating eddy diffusivities from experimental data

De Campos Velho, H.F. and de Moraes, M.R. and Ramos, F.M. and Degrazia, G.A. and Anfossi, D. (2000) An automatic methodology for estimating eddy diffusivities from experimental data. Il nuovo cimento C, 23 C (1). pp. 65-84. ISSN 1826-9885

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A technique for estimating eddy diffusivities in a turbulent atmospheric layer is presented; the scheme adopted is based on an inverse-problem methodology. The inverse problem is formulated as a nonlinear constrained optimization problem, where the objective function is defined through the square differences between experimental and model data. The direct mathematical model is given by the advection-diffusion equation, which is solved by second-order finite-difference method. In the presence of noise it is necessary to use some regularization term; the Tikhonov function and an entropic regularization of zeroth, first and second orders are used in this paper. In addition, two inversion strategies are used: alternate and simultaneous eddy diffusivities estimation. Numerical experiments show a good performance of the proposed methodology.

Item Type: Article
Uncontrolled Keywords: Climatology; Boundary layer structure and processes
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551.6 Climatologia e tempo atmosferico (Classificare qui i lo studio dei Cambiamenti climatici)
Depositing User: Marina Spanti
Date Deposited: 28 Jan 2020 17:29
Last Modified: 28 Jan 2020 17:29

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