Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/4374
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dc.contributorSt. Anthony Falls Hydraulic Laboratory-
dc.contributorEnvironmental Laboratory (U.S.)-
dc.contributorWater Quality Research Program (U.S.)-
dc.contributor.authorWilhelms, Steven C.-
dc.contributor.authorGulliver, John S.-
dc.date.accessioned2016-03-16T19:36:04Z-
dc.date.available2016-03-16T19:36:04Z-
dc.date.issued1994-05-
dc.identifier.urihttp://hdl.handle.net/11681/4374-
dc.descriptionTechnical Report-
dc.descriptionAbstract: Air entrainment in free-surface spillway flows is described with two concepts: "entrained air," which is air being transported by the flow as bubbles, and "entrapped air," which is the air transported with the flow in the roughness of the water surface. Results from flume experiments are used to develop a mathematical description of entrained and entrapped air for flow along a spillway face. Observations from a full-scale spillway validate the procedure. The theory of gas transfer shows how entrained air affects gas transfer with large increases in the interfacial area. A bubble-size distribution, based on photographic analyses, was used to estimate the surface area in self-aerated flow. Previous experimental work defined the minimum air concentration to prevent cavitation damage at approximately 8 percent. The location along the spillway now can be estimated where entrained air at the spillway surface reaches this concentration.-
dc.publisherHydraulics Laboratory (U.S.)-
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1040921-
dc.rightsApproved for public release; distribution is unlimited.-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectAir entrainment-
dc.subjectCavitation-
dc.subjectFree surface-
dc.subjectGas transfer-
dc.subjectSpillway-
dc.subjectDesign-
dc.subjectWater quality-
dc.subjectHydraulic structures-
dc.titleSelf-aerated flow on Corps of Engineers spillways-
dc.typeReporten_US
Appears in Collections:Technical Report

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