Scale effect on mean pressures: study of two reduced models of a ski jump spillway

Detalhes bibliográficos
Autor(a) principal: Borja,João Gerdau de
Data de Publicação: 2019
Outros Autores: Sanagiotto,Daniela Guzzon, Marques,Marcelo Giulian, Canellas,Alba Valéria Brandão, Palauro,Cassius
Tipo de documento: Artigo
Idioma: eng
Título da fonte: RBRH (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312019000100227
Resumo: ABSTRACT The ski jump type spillway is present in large Brazilian dams. After the operation of this type of spillway, a scour hole is originated downstream of the spillway toe, complementing the energy dissipation system, because the jet is cushioned by the waterbed. As the excavation of the scour hole evolves, its shape changes, with the induction of different behaviors of the jet flow within the waterbed. The importance of this scientific study is due to the fact that scour holes downstream of ski jump spillways are in constant transformation, which can cause changes in the patterns of dynamic pressures caused on the bottom. Unexpected erosions can cause instability in the submerged slopes of the pit, jeopardizing the foundation of the dam. In this work it was proceeded physical experiments, by sectional modeling (2D), in two reduced models of 1:50 and 1:100 scales, considering two stages of erosion depths in solid bottom (fixed). It was analyzed the impact site of the jet flow on the bottom, which has the major mean dynamic pressure. As result, it was possible to identify the scale effect in the pressure coefficient between the two models tested, which allowed the adjustment of trend lines that aid to estimate the pressures that occur in prototypes, increasing safety in operation of ski jump spillways.
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spelling Scale effect on mean pressures: study of two reduced models of a ski jump spillwayReduced modelSki jump spillwayPlunging jetScour holeABSTRACT The ski jump type spillway is present in large Brazilian dams. After the operation of this type of spillway, a scour hole is originated downstream of the spillway toe, complementing the energy dissipation system, because the jet is cushioned by the waterbed. As the excavation of the scour hole evolves, its shape changes, with the induction of different behaviors of the jet flow within the waterbed. The importance of this scientific study is due to the fact that scour holes downstream of ski jump spillways are in constant transformation, which can cause changes in the patterns of dynamic pressures caused on the bottom. Unexpected erosions can cause instability in the submerged slopes of the pit, jeopardizing the foundation of the dam. In this work it was proceeded physical experiments, by sectional modeling (2D), in two reduced models of 1:50 and 1:100 scales, considering two stages of erosion depths in solid bottom (fixed). It was analyzed the impact site of the jet flow on the bottom, which has the major mean dynamic pressure. As result, it was possible to identify the scale effect in the pressure coefficient between the two models tested, which allowed the adjustment of trend lines that aid to estimate the pressures that occur in prototypes, increasing safety in operation of ski jump spillways.Associação Brasileira de Recursos Hídricos2019-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312019000100227RBRH v.24 2019reponame:RBRH (Online)instname:Associação Brasileira de Recursos Hídricos (ABRH)instacron:ABRH10.1590/2318-0331.241920180170info:eu-repo/semantics/openAccessBorja,João Gerdau deSanagiotto,Daniela GuzzonMarques,Marcelo GiulianCanellas,Alba Valéria BrandãoPalauro,Cassiuseng2019-06-25T00:00:00Zoai:scielo:S2318-03312019000100227Revistahttps://www.scielo.br/j/rbrh/https://old.scielo.br/oai/scielo-oai.php||rbrh@abrh.org.br2318-03311414-381Xopendoar:2019-06-25T00:00RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)false
dc.title.none.fl_str_mv Scale effect on mean pressures: study of two reduced models of a ski jump spillway
title Scale effect on mean pressures: study of two reduced models of a ski jump spillway
spellingShingle Scale effect on mean pressures: study of two reduced models of a ski jump spillway
Borja,João Gerdau de
Reduced model
Ski jump spillway
Plunging jet
Scour hole
title_short Scale effect on mean pressures: study of two reduced models of a ski jump spillway
title_full Scale effect on mean pressures: study of two reduced models of a ski jump spillway
title_fullStr Scale effect on mean pressures: study of two reduced models of a ski jump spillway
title_full_unstemmed Scale effect on mean pressures: study of two reduced models of a ski jump spillway
title_sort Scale effect on mean pressures: study of two reduced models of a ski jump spillway
author Borja,João Gerdau de
author_facet Borja,João Gerdau de
Sanagiotto,Daniela Guzzon
Marques,Marcelo Giulian
Canellas,Alba Valéria Brandão
Palauro,Cassius
author_role author
author2 Sanagiotto,Daniela Guzzon
Marques,Marcelo Giulian
Canellas,Alba Valéria Brandão
Palauro,Cassius
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Borja,João Gerdau de
Sanagiotto,Daniela Guzzon
Marques,Marcelo Giulian
Canellas,Alba Valéria Brandão
Palauro,Cassius
dc.subject.por.fl_str_mv Reduced model
Ski jump spillway
Plunging jet
Scour hole
topic Reduced model
Ski jump spillway
Plunging jet
Scour hole
description ABSTRACT The ski jump type spillway is present in large Brazilian dams. After the operation of this type of spillway, a scour hole is originated downstream of the spillway toe, complementing the energy dissipation system, because the jet is cushioned by the waterbed. As the excavation of the scour hole evolves, its shape changes, with the induction of different behaviors of the jet flow within the waterbed. The importance of this scientific study is due to the fact that scour holes downstream of ski jump spillways are in constant transformation, which can cause changes in the patterns of dynamic pressures caused on the bottom. Unexpected erosions can cause instability in the submerged slopes of the pit, jeopardizing the foundation of the dam. In this work it was proceeded physical experiments, by sectional modeling (2D), in two reduced models of 1:50 and 1:100 scales, considering two stages of erosion depths in solid bottom (fixed). It was analyzed the impact site of the jet flow on the bottom, which has the major mean dynamic pressure. As result, it was possible to identify the scale effect in the pressure coefficient between the two models tested, which allowed the adjustment of trend lines that aid to estimate the pressures that occur in prototypes, increasing safety in operation of ski jump spillways.
publishDate 2019
dc.date.none.fl_str_mv 2019-01-01
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=S2318-03312019000100227
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312019000100227
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/2318-0331.241920180170
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 Associação Brasileira de Recursos Hídricos
publisher.none.fl_str_mv Associação Brasileira de Recursos Hídricos
dc.source.none.fl_str_mv RBRH v.24 2019
reponame:RBRH (Online)
instname:Associação Brasileira de Recursos Hídricos (ABRH)
instacron:ABRH
instname_str Associação Brasileira de Recursos Hídricos (ABRH)
instacron_str ABRH
institution ABRH
reponame_str RBRH (Online)
collection RBRH (Online)
repository.name.fl_str_mv RBRH (Online) - Associação Brasileira de Recursos Hídricos (ABRH)
repository.mail.fl_str_mv ||rbrh@abrh.org.br
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