Effect of soil textural characteristics on longitudinal dispersion in saturated porous media
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.2478/johh-2021-0004 http://hdl.handle.net/11449/209410 |
Resumo: | This study focuses on the effects of soil textural heterogeneity on longitudinal dispersion under saturation conditions. A series of solute transport experiments were carried out using saturated soil columns packed with two filter sands and two mixtures of these sands, having d(50) values of 95, 324, 402, and 480 mu m, subjected to four different steady flow rates. Values of the dispersion coefficient (D) were estimated from observed in-situ distributions of calcium chloride, injected as a short nonreactive tracer pulse, at four different locations (11, 18, 25, 36 cm). Analyses of the observed distributions in terms of the standard advection-dispersion equation (ADE) showed that D increased nonlinearly with travel distance and higher Peclet numbers+. The dispersion coefficient of sand sample S1 with its largest average particle size (d(50)) was more affected by the average pore-water velocity than sample S4 having the smallest d(50). Results revealed that for a constant velocity, D values of sample S1 were much higher than those of sample S4, which had the smallest d(50). A correlation matrix of parameters controlling the dispersion coefficient showed a relatively strong positive relationship between D and the Peclet number. In contrast, almost no correlation was evident between D and porosity as well as grain size. The results obtained with the four sandy matrices were consistent and proved that the dispersion coefficient depends mainly on the particle size. |
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Repositório Institucional da UNESP |
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Effect of soil textural characteristics on longitudinal dispersion in saturated porous mediaSolute dispersionSoil textural heterogeneitySaturated columnsPeclet numberFlow velocityTravel distanceThis study focuses on the effects of soil textural heterogeneity on longitudinal dispersion under saturation conditions. A series of solute transport experiments were carried out using saturated soil columns packed with two filter sands and two mixtures of these sands, having d(50) values of 95, 324, 402, and 480 mu m, subjected to four different steady flow rates. Values of the dispersion coefficient (D) were estimated from observed in-situ distributions of calcium chloride, injected as a short nonreactive tracer pulse, at four different locations (11, 18, 25, 36 cm). Analyses of the observed distributions in terms of the standard advection-dispersion equation (ADE) showed that D increased nonlinearly with travel distance and higher Peclet numbers+. The dispersion coefficient of sand sample S1 with its largest average particle size (d(50)) was more affected by the average pore-water velocity than sample S4 having the smallest d(50). Results revealed that for a constant velocity, D values of sample S1 were much higher than those of sample S4, which had the smallest d(50). A correlation matrix of parameters controlling the dispersion coefficient showed a relatively strong positive relationship between D and the Peclet number. In contrast, almost no correlation was evident between D and porosity as well as grain size. The results obtained with the four sandy matrices were consistent and proved that the dispersion coefficient depends mainly on the particle size.Gonbad Kavous Univ, Fac Agr & Nat Resources, Gonbad Kavous, IranUniv Utrecht, Dept Earth Sci, Utrecht, NetherlandsSao Paulo State Univ Rio Claro, Ctr Environm Studies, CEA, Rio Claro, SP, BrazilSao Paulo State Univ Rio Claro, Ctr Environm Studies, CEA, Rio Claro, SP, BrazilSciendoGonbad Kavous UnivUniv UtrechtUniversidade Estadual Paulista (Unesp)Mahmoodlu, Mojtaba G.Raoof, Amirvan Genuchten, Martinus Th [UNESP]2021-06-25T12:17:14Z2021-06-25T12:17:14Z2021-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article161-170http://dx.doi.org/10.2478/johh-2021-0004Journal Of Hydrology And Hydromechanics. Warsaw: Sciendo, v. 69, n. 2, p. 161-170, 2021.http://hdl.handle.net/11449/20941010.2478/johh-2021-0004WOS:000655253300004Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Hydrology And Hydromechanicsinfo:eu-repo/semantics/openAccess2021-10-23T19:28:10Zoai:repositorio.unesp.br:11449/209410Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:41:40.702913Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
title |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
spellingShingle |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media Mahmoodlu, Mojtaba G. Solute dispersion Soil textural heterogeneity Saturated columns Peclet number Flow velocity Travel distance |
title_short |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
title_full |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
title_fullStr |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
title_full_unstemmed |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
title_sort |
Effect of soil textural characteristics on longitudinal dispersion in saturated porous media |
author |
Mahmoodlu, Mojtaba G. |
author_facet |
Mahmoodlu, Mojtaba G. Raoof, Amir van Genuchten, Martinus Th [UNESP] |
author_role |
author |
author2 |
Raoof, Amir van Genuchten, Martinus Th [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Gonbad Kavous Univ Univ Utrecht Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Mahmoodlu, Mojtaba G. Raoof, Amir van Genuchten, Martinus Th [UNESP] |
dc.subject.por.fl_str_mv |
Solute dispersion Soil textural heterogeneity Saturated columns Peclet number Flow velocity Travel distance |
topic |
Solute dispersion Soil textural heterogeneity Saturated columns Peclet number Flow velocity Travel distance |
description |
This study focuses on the effects of soil textural heterogeneity on longitudinal dispersion under saturation conditions. A series of solute transport experiments were carried out using saturated soil columns packed with two filter sands and two mixtures of these sands, having d(50) values of 95, 324, 402, and 480 mu m, subjected to four different steady flow rates. Values of the dispersion coefficient (D) were estimated from observed in-situ distributions of calcium chloride, injected as a short nonreactive tracer pulse, at four different locations (11, 18, 25, 36 cm). Analyses of the observed distributions in terms of the standard advection-dispersion equation (ADE) showed that D increased nonlinearly with travel distance and higher Peclet numbers+. The dispersion coefficient of sand sample S1 with its largest average particle size (d(50)) was more affected by the average pore-water velocity than sample S4 having the smallest d(50). Results revealed that for a constant velocity, D values of sample S1 were much higher than those of sample S4, which had the smallest d(50). A correlation matrix of parameters controlling the dispersion coefficient showed a relatively strong positive relationship between D and the Peclet number. In contrast, almost no correlation was evident between D and porosity as well as grain size. The results obtained with the four sandy matrices were consistent and proved that the dispersion coefficient depends mainly on the particle size. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T12:17:14Z 2021-06-25T12:17:14Z 2021-06-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.2478/johh-2021-0004 Journal Of Hydrology And Hydromechanics. Warsaw: Sciendo, v. 69, n. 2, p. 161-170, 2021. http://hdl.handle.net/11449/209410 10.2478/johh-2021-0004 WOS:000655253300004 |
url |
http://dx.doi.org/10.2478/johh-2021-0004 http://hdl.handle.net/11449/209410 |
identifier_str_mv |
Journal Of Hydrology And Hydromechanics. Warsaw: Sciendo, v. 69, n. 2, p. 161-170, 2021. 10.2478/johh-2021-0004 WOS:000655253300004 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal Of Hydrology And Hydromechanics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
161-170 |
dc.publisher.none.fl_str_mv |
Sciendo |
publisher.none.fl_str_mv |
Sciendo |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129451677974528 |