Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Brasileira de Geofísica (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2002000200004 |
Resumo: | Accounting for the current knowledge of the Convective Boundary Layer (CBL) structure and characteristics, a new formulation for eddy diffusivities has been derived, to be used in atmospheric dispersion models. Expressions are proposed for eddy diffusivities depending on source distance for inhomogeneous turbulence calculated directly with the Batchelor theory. The classical statistical diffusion theory, the observed spectral properties and the observed characteristics of energy-containing eddies are used to estimate these parameters. In addition, a vertical eddy diffusivity was introduced in an air pollution model and validated with the data of Copenhagen experiments and compared with the results of the obtained from classic formulation of the literature. A statistical evaluation show that, the results of the dispersion model with the K-parameterisation included, produces a good fit of the measured ground-level concentration data in the experimental conditions considered. Furthermore, the current work suggests that wind and eddy diffusivities profiles physically more realistic are important in regions near of an elevated source, and improves the description of the transport process of atmospheric pollutants. |
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Revista Brasileira de Geofísica (Online) |
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Derivation of an eddy diffusivity depending on source distance under moderately unstable conditionseddy diffusivityanalytical modelinhomoheneous turbulencePlanetary Boundary LayerAccounting for the current knowledge of the Convective Boundary Layer (CBL) structure and characteristics, a new formulation for eddy diffusivities has been derived, to be used in atmospheric dispersion models. Expressions are proposed for eddy diffusivities depending on source distance for inhomogeneous turbulence calculated directly with the Batchelor theory. The classical statistical diffusion theory, the observed spectral properties and the observed characteristics of energy-containing eddies are used to estimate these parameters. In addition, a vertical eddy diffusivity was introduced in an air pollution model and validated with the data of Copenhagen experiments and compared with the results of the obtained from classic formulation of the literature. A statistical evaluation show that, the results of the dispersion model with the K-parameterisation included, produces a good fit of the measured ground-level concentration data in the experimental conditions considered. Furthermore, the current work suggests that wind and eddy diffusivities profiles physically more realistic are important in regions near of an elevated source, and improves the description of the transport process of atmospheric pollutants.Sociedade Brasileira de Geofísica2002-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2002000200004Revista Brasileira de Geofísica v.20 n.2 2002reponame:Revista Brasileira de Geofísica (Online)instname:Sociedade Brasileira de Geofísica (SBG)instacron:SBG10.1590/S0102-261X2002000200004info:eu-repo/semantics/openAccessGoulart,Antônio GledsonMoreira,Davidson MartinsCarvalho,Jonas da Costaeng2007-01-18T00:00:00Zoai:scielo:S0102-261X2002000200004Revistahttp://www.scielo.br/rbgONGhttps://old.scielo.br/oai/scielo-oai.php||sbgf@sbgf.org.br1809-45110102-261Xopendoar:2007-01-18T00:00Revista Brasileira de Geofísica (Online) - Sociedade Brasileira de Geofísica (SBG)false |
dc.title.none.fl_str_mv |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
title |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
spellingShingle |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions Goulart,Antônio Gledson eddy diffusivity analytical model inhomoheneous turbulence Planetary Boundary Layer |
title_short |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
title_full |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
title_fullStr |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
title_full_unstemmed |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
title_sort |
Derivation of an eddy diffusivity depending on source distance under moderately unstable conditions |
author |
Goulart,Antônio Gledson |
author_facet |
Goulart,Antônio Gledson Moreira,Davidson Martins Carvalho,Jonas da Costa |
author_role |
author |
author2 |
Moreira,Davidson Martins Carvalho,Jonas da Costa |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Goulart,Antônio Gledson Moreira,Davidson Martins Carvalho,Jonas da Costa |
dc.subject.por.fl_str_mv |
eddy diffusivity analytical model inhomoheneous turbulence Planetary Boundary Layer |
topic |
eddy diffusivity analytical model inhomoheneous turbulence Planetary Boundary Layer |
description |
Accounting for the current knowledge of the Convective Boundary Layer (CBL) structure and characteristics, a new formulation for eddy diffusivities has been derived, to be used in atmospheric dispersion models. Expressions are proposed for eddy diffusivities depending on source distance for inhomogeneous turbulence calculated directly with the Batchelor theory. The classical statistical diffusion theory, the observed spectral properties and the observed characteristics of energy-containing eddies are used to estimate these parameters. In addition, a vertical eddy diffusivity was introduced in an air pollution model and validated with the data of Copenhagen experiments and compared with the results of the obtained from classic formulation of the literature. A statistical evaluation show that, the results of the dispersion model with the K-parameterisation included, produces a good fit of the measured ground-level concentration data in the experimental conditions considered. Furthermore, the current work suggests that wind and eddy diffusivities profiles physically more realistic are important in regions near of an elevated source, and improves the description of the transport process of atmospheric pollutants. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-08-01 |
dc.type.driver.fl_str_mv |
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://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2002000200004 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-261X2002000200004 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0102-261X2002000200004 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Geofísica |
publisher.none.fl_str_mv |
Sociedade Brasileira de Geofísica |
dc.source.none.fl_str_mv |
Revista Brasileira de Geofísica v.20 n.2 2002 reponame:Revista Brasileira de Geofísica (Online) instname:Sociedade Brasileira de Geofísica (SBG) instacron:SBG |
instname_str |
Sociedade Brasileira de Geofísica (SBG) |
instacron_str |
SBG |
institution |
SBG |
reponame_str |
Revista Brasileira de Geofísica (Online) |
collection |
Revista Brasileira de Geofísica (Online) |
repository.name.fl_str_mv |
Revista Brasileira de Geofísica (Online) - Sociedade Brasileira de Geofísica (SBG) |
repository.mail.fl_str_mv |
||sbgf@sbgf.org.br |
_version_ |
1754820936300756992 |