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Incipient Motion Under Shallow Flow Conditions

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dc.contributor.authorKanellopoulos, Paul M.en
dc.contributor.committeechairDiplas, Panayiotisen
dc.contributor.committeememberDancey, Clinton L.en
dc.contributor.committeememberLoganathan, G. V.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T20:30:57Zen
dc.date.adate1999-02-02en
dc.date.available2014-03-14T20:30:57Zen
dc.date.issued1998-12-16en
dc.date.rdate2006-10-21en
dc.date.sdate1999-01-19en
dc.description.abstractLaboratory experiments were conducted to investigate the effect of low relative depth and high Froude number on the dimensionless critical shear stress (Shields parameter). Spherical particles of four different densities and an 8mm diameter were used as movable test material. The relative depth ranged from 2 to 12 and the Froude number ranged from 0.36 to 1.29. The results show that the traditional Shields diagram cannot be used to predict the incipient motion of coarse sediment particles when the relative depth is below 10 and the Froude number is above 0.5, approximately. Experiments using glass balls, whose density is almost identical to that of natural gravel, show that the Shields parameter can be twice as large in shallow flows than in deep flows. The results also show that the Shields parameter is dependent on the density of the particles. Data obtained from other studies support the findings of the present work. These findings can result in significant cost savings for riprap. Additionally, velocity profiles using a laser-Doppler velocimeter (LDV) were taken for the glass ball incipient motion experiments. The purpose of this was to study possible changes in the velocity distribution with decreasing relative depth and increasing Froude number. The results show that the von Karman and integral constants in the law of the wall do not change in the range of relative depths and Froude numbers tested.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-011999-232112en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-011999-232112/en
dc.identifier.urihttp://hdl.handle.net/10919/30999en
dc.publisherVirginia Techen
dc.relation.haspartThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectProbability of Entrainmenten
dc.subjectRough Wallsen
dc.subjectSurface Wavesen
dc.subjectShallow Flowsen
dc.subjectThreshold Conditionsen
dc.subjectRelative Depthen
dc.subjectMountain Riversen
dc.titleIncipient Motion Under Shallow Flow Conditionsen
dc.typeThesisen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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