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Flow field at open-channel contractions: insights from a two-dimensional numerical model

dc.contributor.authorZey, Scott S., author
dc.contributor.authorEttema, Robert, advisor
dc.contributor.authorNelson, Peter A., committee member
dc.contributor.authorCovino, Timothy P., committee member
dc.description2017 Fall.
dc.descriptionIncludes bibliographical references.
dc.description.abstractA depth averaged, two-dimensional numerical model was used to investigate the hydraulics of flow passing through open-channel contractions. The investigation focused on the magnitude and location(s) of maximum velocity of flow entering a contraction. The effective flow width at the entrance of the contraction and the maximum lateral velocity at the contraction entrance were also investigated. The responses of these flow characteristics were studied as values of contraction ratio, channel roughness, bed slope, and transition geometry were varied. The numerical model produced significant new insights. The factors affecting the values and distribution of velocity in a contraction include: channel slope, bed roughness, and contraction shape. The magnitude and location of maximum velocity in the contraction varies with contraction ratio. For contraction ratios milder than approximately 0.5 the velocity maximum occurs at two locations, and at one location for tighter contractions. At a contraction ratio of 0.5 lateral velocity reached a maximum and effective flow width a minimum. Channel slope and bed roughness affect the values and distribution of velocity in a contraction, as did contraction shape. These findings have engineering significance for explaining and estimating scour of alluvial channels in contractions, such as at bridge waterways.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.publisherColorado State University. Libraries
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dc.titleFlow field at open-channel contractions: insights from a two-dimensional numerical model
dcterms.rights.dplaThis Item is protected by copyright and/or related rights ( You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). and Environmental Engineering State University of Science (M.S.)


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