Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim
Autor(a) principal: | |
---|---|
Data de Publicação: | 2010 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/7756 |
Resumo: | This dissertation presents the experimental determination of the two most important coefficients in modeling of dissolved oxygen in water bodies: the reaeration-rate coefficient K2 and the deoxygenation coefficient K1. The deoxygenation coefficient was determined in three representative sections of the considered basin: the first with urban characteristics, the second mixed and the third rural characteristics. Three experiments were conducted, featuring different flows in the Vacacaí Mirim River. K1 was determined by constructing the oxygen depletion versus time curve, in a 20 days period. K1 ranged from 0.15 day-1 to 0.27 day-1. An increase in K1 value was observed due to flow increment, in mixed and rural characteristics areas, reflecting the major contribution of diffuse organic load in those areas. It was not possible to observe a significant variation of flow in the urban feature section, due to damping of the flow by the upstream reservoir. This section is considered to present a decrease in the K1 value as liquid discharge increases, since it is noticeable the sewage contribution. The reaeration-rate coefficient was determined using inert tracer technique, applying propane as gas tracer and Rhodamine WT as dye tracer. Two experiments were conducted in two reaches, both in the highest urbanization areas of the Vacacaí Mirim basin. In the first experiment, K2 value was 30.30 day-1 for the first reach, and 24.77 day-1 for the second. In the second test, K2 obtained was 14.91 day-1 and 12.73 day-1, respectively. An approach was made about alternative methods for experimental determination of the reaeration-rate coefficient and the predictive equations of K2. The results obtained in tests were compared with those predicted by the most important equations in literature. The predictive equations presented large discrepancy between them, and the latest formulas, derived from K2 measurements obtained by the gas tracer methods, presented the lowest variation, ranging from -32.95% to 14.51%. Based on results, an equation was proposed to estimate K2 restricted to the studied sites, adapting from the equations of Melching and Flores. |
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2011-01-282011-01-282010-11-30FORMENTINI, Thiago Augusto. DEOXYGENATION AND REAERATION COEFFICIENTS ON VACACAÍ MIRIM RIVER REACHES. 2010. 91 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2010.http://repositorio.ufsm.br/handle/1/7756This dissertation presents the experimental determination of the two most important coefficients in modeling of dissolved oxygen in water bodies: the reaeration-rate coefficient K2 and the deoxygenation coefficient K1. The deoxygenation coefficient was determined in three representative sections of the considered basin: the first with urban characteristics, the second mixed and the third rural characteristics. Three experiments were conducted, featuring different flows in the Vacacaí Mirim River. K1 was determined by constructing the oxygen depletion versus time curve, in a 20 days period. K1 ranged from 0.15 day-1 to 0.27 day-1. An increase in K1 value was observed due to flow increment, in mixed and rural characteristics areas, reflecting the major contribution of diffuse organic load in those areas. It was not possible to observe a significant variation of flow in the urban feature section, due to damping of the flow by the upstream reservoir. This section is considered to present a decrease in the K1 value as liquid discharge increases, since it is noticeable the sewage contribution. The reaeration-rate coefficient was determined using inert tracer technique, applying propane as gas tracer and Rhodamine WT as dye tracer. Two experiments were conducted in two reaches, both in the highest urbanization areas of the Vacacaí Mirim basin. In the first experiment, K2 value was 30.30 day-1 for the first reach, and 24.77 day-1 for the second. In the second test, K2 obtained was 14.91 day-1 and 12.73 day-1, respectively. An approach was made about alternative methods for experimental determination of the reaeration-rate coefficient and the predictive equations of K2. The results obtained in tests were compared with those predicted by the most important equations in literature. The predictive equations presented large discrepancy between them, and the latest formulas, derived from K2 measurements obtained by the gas tracer methods, presented the lowest variation, ranging from -32.95% to 14.51%. Based on results, an equation was proposed to estimate K2 restricted to the studied sites, adapting from the equations of Melching and Flores.Esta dissertação apresenta a determinação experimental dos dois coeficientes mais importantes na modelagem do oxigênio dissolvido em corpos d‟água: o coeficiente de reaeração superficial K2, e o coeficiente de desoxigenação K1. O coeficiente de desoxigenação foi determinado em três seções representativas da bacia em estudo, sendo uma com característica urbana, uma mista e uma rural. Três experimentos foram conduzidos, caracterizando diferentes vazões no rio Vacacaí Mirim. O coeficiente K1 foi determinado por meio da construção da curva de decaimento de oxigênio versus tempo, num período total de 20 dias. Os valores de K1 variaram de 0,15 dia-1 a 0,27 dia-1. Observou-se um aumento de K1 com o aumento da vazão, nas seções de característica mista e rural, evidenciando a maior contribuição da carga orgânica de maneira difusa nessas áreas. Não foi possível observar uma variação de vazão significativa na seção de característica urbana, devido ao amortecimento do escoamento pelo reservatório situado a montante da seção. Nesta seção, possivelmente, um aumento na descarga líquida acarreta uma diminuição no valor do coeficiente de desoxigenação, já que é visível a contribuição pontual de esgoto doméstico. O coeficiente de reaeração superficial foi determinado utilizando a metodologia dos traçadores inertes, com o emprego de propano como traçador gasoso e Rodamina WT como traçador de referência. Dois experimentos foram conduzidos em dois trechos, na região de maior urbanização da bacia hidrográfica do rio Vacacaí Mirim. No primeiro experimento, o valor de K2 foi de 30,30 dia-1, para o primeiro trecho, e 24,77 dia-1, para o segundo. No segundo ensaio, o K2 obtido foi de 14,91 dia-1 e 12,73 dia-1, respectivamente. Aborda-se a respeito de outras metodologias de determinação experimental do coeficiente de reaeração, bem como sobre as equações de estimativa de K2. O valor obtido nos ensaios foi comparado com aqueles previstos pelas principais equações presentes na literatura. O valor estimado pelas equações apresentou grande discrepância entre as mesmas, sendo que as equações mais recentes, propostas a partir da regressão de dados de K2 obtidos pela própria metodologia dos traçadores inertes, apresentaram as menores variações, entre -32,95% e 14,51%. Baseado nos resultados propôs-se uma equação para estimativa de K2 exclusiva para os trechos estudados, adaptada a partir das equações de Melching e Flores.application/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Engenharia CivilUFSMBREngenharia CivilReaeração superficialTraçadoresDesoxigenaçãoOxigênio dissolvidoReaerationTracersDeoxygenationDissolved oxygenCNPQ::ENGENHARIAS::ENGENHARIA CIVILCoeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí MirimDeoxygenation and reaeration coefficients on Vacacaí Mirim river reachesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisGastaldini, Maria do Carmo Caudurohttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790803A8Pinheiro, Adilsonhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787528J1Wolff, Delmira Beatrizhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792154J1http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4164351Y2Formentini, Thiago Augusto3001000000034005003003005002cc9d0c1-f81b-4939-b877-930e7c0ce98ea7d40cff-9be1-4852-8a68-8b2a94126d4e71290dd4-9a61-469d-b6e4-e2f54f99415e6095ac76-fc26-4a3f-a4cd-b12beaa47c77info:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALFORMENTINI, THIAGO AUGUSTO.pdfapplication/pdf2283523http://repositorio.ufsm.br/bitstream/1/7756/1/FORMENTINI%2c%20THIAGO%20AUGUSTO.pdff92ffd6fd2384150e35768316554dff8MD51TEXTFORMENTINI, THIAGO AUGUSTO.pdf.txtFORMENTINI, THIAGO AUGUSTO.pdf.txtExtracted texttext/plain150691http://repositorio.ufsm.br/bitstream/1/7756/2/FORMENTINI%2c%20THIAGO%20AUGUSTO.pdf.txtfa42751d740a0ec16d00804f08d4578dMD52THUMBNAILFORMENTINI, THIAGO AUGUSTO.pdf.jpgFORMENTINI, THIAGO AUGUSTO.pdf.jpgIM Thumbnailimage/jpeg5057http://repositorio.ufsm.br/bitstream/1/7756/3/FORMENTINI%2c%20THIAGO%20AUGUSTO.pdf.jpgffb1d32671f76f94c87e5c95c55650abMD531/77562022-01-11 12:09:06.238oai:repositorio.ufsm.br:1/7756Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-01-11T15:09:06Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
dc.title.alternative.eng.fl_str_mv |
Deoxygenation and reaeration coefficients on Vacacaí Mirim river reaches |
title |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
spellingShingle |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim Formentini, Thiago Augusto Reaeração superficial Traçadores Desoxigenação Oxigênio dissolvido Reaeration Tracers Deoxygenation Dissolved oxygen CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
title_full |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
title_fullStr |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
title_full_unstemmed |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
title_sort |
Coeficientes de desoxigenação e de reaeração superficial em trechos do rio Vacacaí Mirim |
author |
Formentini, Thiago Augusto |
author_facet |
Formentini, Thiago Augusto |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Gastaldini, Maria do Carmo Cauduro |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4790803A8 |
dc.contributor.referee1.fl_str_mv |
Pinheiro, Adilson |
dc.contributor.referee1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787528J1 |
dc.contributor.referee2.fl_str_mv |
Wolff, Delmira Beatriz |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792154J1 |
dc.contributor.authorLattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4164351Y2 |
dc.contributor.author.fl_str_mv |
Formentini, Thiago Augusto |
contributor_str_mv |
Gastaldini, Maria do Carmo Cauduro Pinheiro, Adilson Wolff, Delmira Beatriz |
dc.subject.por.fl_str_mv |
Reaeração superficial Traçadores Desoxigenação Oxigênio dissolvido |
topic |
Reaeração superficial Traçadores Desoxigenação Oxigênio dissolvido Reaeration Tracers Deoxygenation Dissolved oxygen CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
dc.subject.eng.fl_str_mv |
Reaeration Tracers Deoxygenation Dissolved oxygen |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA CIVIL |
description |
This dissertation presents the experimental determination of the two most important coefficients in modeling of dissolved oxygen in water bodies: the reaeration-rate coefficient K2 and the deoxygenation coefficient K1. The deoxygenation coefficient was determined in three representative sections of the considered basin: the first with urban characteristics, the second mixed and the third rural characteristics. Three experiments were conducted, featuring different flows in the Vacacaí Mirim River. K1 was determined by constructing the oxygen depletion versus time curve, in a 20 days period. K1 ranged from 0.15 day-1 to 0.27 day-1. An increase in K1 value was observed due to flow increment, in mixed and rural characteristics areas, reflecting the major contribution of diffuse organic load in those areas. It was not possible to observe a significant variation of flow in the urban feature section, due to damping of the flow by the upstream reservoir. This section is considered to present a decrease in the K1 value as liquid discharge increases, since it is noticeable the sewage contribution. The reaeration-rate coefficient was determined using inert tracer technique, applying propane as gas tracer and Rhodamine WT as dye tracer. Two experiments were conducted in two reaches, both in the highest urbanization areas of the Vacacaí Mirim basin. In the first experiment, K2 value was 30.30 day-1 for the first reach, and 24.77 day-1 for the second. In the second test, K2 obtained was 14.91 day-1 and 12.73 day-1, respectively. An approach was made about alternative methods for experimental determination of the reaeration-rate coefficient and the predictive equations of K2. The results obtained in tests were compared with those predicted by the most important equations in literature. The predictive equations presented large discrepancy between them, and the latest formulas, derived from K2 measurements obtained by the gas tracer methods, presented the lowest variation, ranging from -32.95% to 14.51%. Based on results, an equation was proposed to estimate K2 restricted to the studied sites, adapting from the equations of Melching and Flores. |
publishDate |
2010 |
dc.date.issued.fl_str_mv |
2010-11-30 |
dc.date.accessioned.fl_str_mv |
2011-01-28 |
dc.date.available.fl_str_mv |
2011-01-28 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
FORMENTINI, Thiago Augusto. DEOXYGENATION AND REAERATION COEFFICIENTS ON VACACAÍ MIRIM RIVER REACHES. 2010. 91 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2010. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/7756 |
identifier_str_mv |
FORMENTINI, Thiago Augusto. DEOXYGENATION AND REAERATION COEFFICIENTS ON VACACAÍ MIRIM RIVER REACHES. 2010. 91 f. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal de Santa Maria, Santa Maria, 2010. |
url |
http://repositorio.ufsm.br/handle/1/7756 |
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por |
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UFSM |
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Engenharia Civil |
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Universidade Federal de Santa Maria |
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