Reduction of bend scour with an air-bubble screen - morphology and flow patterns-中国期刊网

摘要 Theinterplaybetweenstreamwiseflow,curvature-inducedsecondaryflow,sedimenttransportandbedmorphologyleadstotheformationofatypicalbar-poolbedmorphologyinopen-channelbends.Theassociatedscourattheouterbankanddepositionattheinnerbankmayendangertheouterbank'sstabilityorreducethenavigablewidthofthechannel.Previouspreliminarylaboratoryexperimentsinasharplycurvedflumewithafixedhorizontalbedhaveshownthatabubblescreenlocatedneartheouterbankcangenerateanadditionalsecondaryflowlocatedbetweentheouterbankandthecurvature-inducedsecondaryflowandwithasenseofrotationoppositetothelatter.Thisbubble-inducedsecondaryflowredistributesvelocitiesandbedshearstresses.Thereportedstudyinvestigatestheimplicationsofabubblescreenontheflowandthemorphologyinconfigurationswithmobilebed.Velocitymeasurementsshowthatthebubble-inducedsecondaryflowshiftsthecurvature-inducedsecondaryflowininwardsdirectionandreducesitsstrength.Thebubblescreenconsiderablyreducesmorphologicalgradients.Maximumbendscourisreducedbyabout50%andoccursfurtherawayfromtheouterbankwhereitdoesnotendangerthebankstabilityanymore.Thelocationofmaximumscourcoincideswiththejunctionofthecurvature-inducedandbubble-inducedsecondaryflows.Atthissamelocation,themaximumstreamwisevelocitiesandmaximumverticalvelocitiesimpingingonthebedalsooccur,whichindicatestheirimportancewithrespecttotheformationofbendscour.Thebubblescreenalsosubstantiallyreduceddepositionattheinnerbank.Thesepreliminaryexperimentsshowthepotentialofabubblescreentoinfluenceandmodifythebedmorphology.

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Reduction of bend scour with an air-bubble screen - morphology and flow patterns

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Reduction of bend scour with an air-bubble screen - morphology and flow patterns

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