Repository logo
 

Baffle-post structures for flow control in open channels

Simple item page
dc.contributor.authorUbing, Caroline, author
dc.contributor.authorThornton, Christopher, advisor
dc.contributor.authorEttema, Robert, advisor
dc.contributor.authorBledsoe, Brian, committee member
dc.contributor.authorWohl, Ellen, committee member
dc.date.accessioned2015-08-27T03:57:14Z
dc.date.available2015-08-27T03:57:14Z
dc.date.issued2015
dc.description.abstractThis thesis presents theory and laboratory findings regarding the hydraulic performance of baffle-post structures used as a means for controlling flow in open channels. Such structures comprise one to two parallel rows of posts that extend slightly higher than the anticipated depth of flow, and offer a useful means for retarding flow in various channel situations where there is a need to reduce flow energy, possibly to reduce flow capacity to transport bed sediment and manage channel morphology. Observations and data regarding headloss and discharge coefficients and backwater flow profiles associated with varying structure geometry were obtained so as to determine the extent to which a baffle-post structure will retard an approach flow and reduces its capacity to convey bed sediment. The creation of a M₁ gradually varied flow profile in the upstream reach complicates the use of headloss to characterize hydraulic performance of the baffle-post structures. Instead, the parameter, y₁/y₀, offers a practical means for describing such performance; y₁= flow depth at the upstream face of the structure, and y₀= the depth of uniform flow prior to use of a structure. The most influential geometric variable was influencing structure performance was the lateral spacing between posts, s; it is expressed non-dimensionally as s/D, where D = post diameter. Qualitative results regarding sediment transport confirm a reduction in bed-sediment transport rate upstream of the structure. However, the turbulent flow structures at the baffle-post structures promote local scour at the base of such structures. Due to the flow acceleration between posts, baffle-posts structures could potentially obstruct fish and other aquatic life passage along the channel.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierUbing_colostate_0053N_12938.pdf
dc.identifier.urihttp://hdl.handle.net/10217/166972
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectgrade control structures
dc.subjecthydraulic structures
dc.subjectflow control
dc.subjectsediment transport
dc.subjecthead loss coefficient
dc.titleBaffle-post structures for flow control in open channels
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). 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).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Ubing_colostate_0053N_12938.pdf
Size:
5.29 MB
Format:
Adobe Portable Document Format
Download

Collections

2000-2019
Theses and Dissertations