Development of an analytical Lagrangian model for passive scalar dispersion in low-wind speed meandering conditions

Autor: Luis Gustavo Nogueira Martins, Jonas C. Carvalho, Domenico Anfossi, G.A. Degrazia, Michel Stefanello, Silvana Maldaner, Otávio C. Acevedo, Débora Regina Roberti, Lidiane Buligon, Celene Buriol, Luca Mortarini
Rok vydání: 2018
Předmět:
Zdroj: Physica. A
(2017). doi:10.1016/j.physa.2017.11.031
info:cnr-pdr/source/autori:M.B. Stefanello and G.A. Degrazia and L. Mortarini and L. Buligon and S. Maldaner and J.C. Carvalho and O.C. Acevedo and L.G.N. Martins and D. Anfossi and C. Buriol and D. Roberti/titolo:Development of an analytical Lagrangian model for passive scalar dispersion in low-wind speed meandering conditions/doi:10.1016%2Fj.physa.2017.11.031/rivista:Physica. A (Print)/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume
ISSN: 0378-4371
Popis: Describing the effects of wind meandering motions on the dispersion of scalars is a challenging task, since this type of flow represents a physical state characterized by multiple scales. In this study, a Lagrangian stochastic diffusion model is derived to describe scalar transport during the horizontal wind meandering phenomenon that occurs within a planetary boundary layer. The model is derived from the linearization of the Langevin equation, and it employs a heuristic functional form that represents the autocorrelation function of meandering motion. The new solutions, which describe the longitudinal and lateral wind components, were used to simulate tracer experiments that were performed in low-wind speed conditions. The results of the comparison indicate that the new model can effectively reproduce the observed concentrations of the contaminants, and therefore, it can satisfactorily describe enhanced dispersion effects due to the presence of meandering.
Databáze: OpenAIRE
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