Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/189217 |
Resumo: | In the literature there exists a variety of pollution of dispersion models and in general, Lagrangian stochastic models are efficient and fundamentals tools in the investigation and study of turbulent diffusion phenomenon in the planetary boundary layer. The LAMBDA model is one of them. In this study, the influence of decorrelation time scales in the LAMBDA model under neutral conditions is evaluated. To this end a new parameterization of decorrelation time scales is proposed and validated. This method is based on the Eulerian velocity spectra and a formulation of the evolution of the Lagrangian decorrelation timescales. A spectral distribution of an Eulerian velocity profile and a formulation of the evolution of Lagrangian decorrelation timescales under neutral conditions is used as the forcing mechanisms (shear-dominated boundary layer) for the turbulent dispersion. The model performance was established by comparing the levels of ground-level concentrations of the tracer gas with experimental results from the classical Prarie Grass experiment. |
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Degrazia, Franco CaldasDegrazia, Gervasio AnnesVilhena, Marco Tullio Menna Barreto deBodmann, Bardo Ernst Josef2019-03-02T02:31:31Z20162166-465Xhttp://hdl.handle.net/10183/189217001009950In the literature there exists a variety of pollution of dispersion models and in general, Lagrangian stochastic models are efficient and fundamentals tools in the investigation and study of turbulent diffusion phenomenon in the planetary boundary layer. The LAMBDA model is one of them. In this study, the influence of decorrelation time scales in the LAMBDA model under neutral conditions is evaluated. To this end a new parameterization of decorrelation time scales is proposed and validated. This method is based on the Eulerian velocity spectra and a formulation of the evolution of the Lagrangian decorrelation timescales. A spectral distribution of an Eulerian velocity profile and a formulation of the evolution of Lagrangian decorrelation timescales under neutral conditions is used as the forcing mechanisms (shear-dominated boundary layer) for the turbulent dispersion. The model performance was established by comparing the levels of ground-level concentrations of the tracer gas with experimental results from the classical Prarie Grass experiment.application/pdfengAmerican Journal of Environmental Engineering [recurso eletrônico]. Rosemead. Vol. 6, no. 4A (016), p. 56-65Camada limite atmosféricaDispersão de poluentesDispersão turbulentaModelos matemáticosPlanetary boundary layerTurbulent eulerian velocity variance spectraShear-dominated boundary layerLagrangian decorrelation time scalesDerivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layerEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001009950.pdf.txt001009950.pdf.txtExtracted Texttext/plain54403http://www.lume.ufrgs.br/bitstream/10183/189217/2/001009950.pdf.txt28be2e53a4df6c0773c1bd1a1ad6bf47MD52ORIGINAL001009950.pdfTexto completo (inglês)application/pdf433358http://www.lume.ufrgs.br/bitstream/10183/189217/1/001009950.pdfa4a2d956725989dd89d0725044c154a9MD5110183/1892172019-03-20 02:30:36.521573oai:www.lume.ufrgs.br:10183/189217Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2019-03-20T05:30:36Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
title |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
spellingShingle |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer Degrazia, Franco Caldas Camada limite atmosférica Dispersão de poluentes Dispersão turbulenta Modelos matemáticos Planetary boundary layer Turbulent eulerian velocity variance spectra Shear-dominated boundary layer Lagrangian decorrelation time scales |
title_short |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
title_full |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
title_fullStr |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
title_full_unstemmed |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
title_sort |
Derivation of a decorrelation timescale depending on source distance for inhomogeneous turbulence in a shear dominated planetary boundary layer |
author |
Degrazia, Franco Caldas |
author_facet |
Degrazia, Franco Caldas Degrazia, Gervasio Annes Vilhena, Marco Tullio Menna Barreto de Bodmann, Bardo Ernst Josef |
author_role |
author |
author2 |
Degrazia, Gervasio Annes Vilhena, Marco Tullio Menna Barreto de Bodmann, Bardo Ernst Josef |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Degrazia, Franco Caldas Degrazia, Gervasio Annes Vilhena, Marco Tullio Menna Barreto de Bodmann, Bardo Ernst Josef |
dc.subject.por.fl_str_mv |
Camada limite atmosférica Dispersão de poluentes Dispersão turbulenta Modelos matemáticos |
topic |
Camada limite atmosférica Dispersão de poluentes Dispersão turbulenta Modelos matemáticos Planetary boundary layer Turbulent eulerian velocity variance spectra Shear-dominated boundary layer Lagrangian decorrelation time scales |
dc.subject.eng.fl_str_mv |
Planetary boundary layer Turbulent eulerian velocity variance spectra Shear-dominated boundary layer Lagrangian decorrelation time scales |
description |
In the literature there exists a variety of pollution of dispersion models and in general, Lagrangian stochastic models are efficient and fundamentals tools in the investigation and study of turbulent diffusion phenomenon in the planetary boundary layer. The LAMBDA model is one of them. In this study, the influence of decorrelation time scales in the LAMBDA model under neutral conditions is evaluated. To this end a new parameterization of decorrelation time scales is proposed and validated. This method is based on the Eulerian velocity spectra and a formulation of the evolution of the Lagrangian decorrelation timescales. A spectral distribution of an Eulerian velocity profile and a formulation of the evolution of Lagrangian decorrelation timescales under neutral conditions is used as the forcing mechanisms (shear-dominated boundary layer) for the turbulent dispersion. The model performance was established by comparing the levels of ground-level concentrations of the tracer gas with experimental results from the classical Prarie Grass experiment. |
publishDate |
2016 |
dc.date.issued.fl_str_mv |
2016 |
dc.date.accessioned.fl_str_mv |
2019-03-02T02:31:31Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/189217 |
dc.identifier.issn.pt_BR.fl_str_mv |
2166-465X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001009950 |
identifier_str_mv |
2166-465X 001009950 |
url |
http://hdl.handle.net/10183/189217 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
American Journal of Environmental Engineering [recurso eletrônico]. Rosemead. Vol. 6, no. 4A (016), p. 56-65 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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UFRGS |
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Repositório Institucional da UFRGS |
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