Please use this identifier to cite or link to this item: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1010184
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dc.contributor.authorProust, S.pt_BR
dc.contributor.authorFernandes, J. N.pt_BR
dc.contributor.authorLeal, J. B.pt_BR
dc.contributor.authorRiviere, N.pt_BR
dc.contributor.authorPeltier, Y.pt_BR
dc.date.accessioned2017-12-22T12:29:11Zpt_BR
dc.date.accessioned2018-03-06T15:40:18Z-
dc.date.available2017-12-22T12:29:11Zpt_BR
dc.date.available2018-03-06T15:40:18Z-
dc.date.issued2017-04pt_BR
dc.identifier.citationhttp://onlinelibrary.wiley.com/doi/10.1002/2016WR019873/abstractpt_BR
dc.identifier.urihttps://repositorio.lnec.pt/jspui/handle/123456789/1010184-
dc.description.abstractTurbulent mixing layers associated with streamwise uniform and nonuniform flows in compound channels (main channel with adjacent floodplains) are experimentally investigated. The experiments start with uniform flow conditions. The streamwise nonuniformity is then generated by imposing an imbalance in the upstream discharge distribution between main channel (MC) and floodplains (FPs), keeping the total discharge constant, which results in a transverse depth-averaged mean flow. This study first aims at assessing the effect of a transverse flow on the mixing layer and coherent structures that form at the MC/FP interfaces. A wide range of initial velocity ratio or dimensionless shear between MC and FP is tested. The study second aims at assessing the effect of this velocity ratio on the mixing layer, for a fixed vertical confinement of flow. The total discharge was then varied to quantify the confinement effect. The results show that, far from the inlet section, Reynolds-stresses increase with local velocity ratio for a fixed confinement and decrease with confinement for a fixed velocity ratio. It is also shown that, irrespective of confinement, the existence of quasi-two-dimensional coherent structures is driven by velocity ratio and the direction and magnitude of transverse flow. These structures cannot develop if velocity ratio is lower than 0.3 and if a strong transverse flow toward the MC occurs. In the latter case, the transverse flow is the predominant contribution to momentum exchange (compared with turbulent mixing and secondary currents), convex mean velocity profiles are observed, preventing the formation of quasi-two-dimensional structures.pt_BR
dc.language.isoengpt_BR
dc.publisherWiley Online Librarypt_BR
dc.rightsrestrictedAccesspt_BR
dc.subjectCompound channelspt_BR
dc.subjectFloodspt_BR
dc.subjectMixing layerspt_BR
dc.titleMixing layer and coherent structures in compound channel flows: Effects of transverse flow, velocity ratio, and vertical confinementpt_BR
dc.typeworkingPaperpt_BR
dc.description.pages3387–3406pppt_BR
dc.description.volumeVolume 53, Issue 4pt_BR
dc.description.sectorDHA/NREpt_BR
dc.description.magazineWater Resources Researchpt_BR
dc.contributor.peer-reviewedSIMpt_BR
dc.contributor.academicresearchersNAOpt_BR
dc.contributor.arquivoNAOpt_BR
Appears in Collections:DM/NMC - Comunicações a congressos e artigos de revista

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