Metadata only
Date
2002-05Type
- Journal Article
ETH Bibliography
yes
Altmetrics
Abstract
Two related problems of sediment hydraulics are addressed: (1) Inception of sediment transport for nearly uniform flow of both uniform and nonuniform sediment beds for two different sediment densities and grain sizes ranging from sand to gravel, and (2) generalized inception conditions if elements are inserted in a plane sediment bed. The Shields’ criterion is formulated with basic quantities involving gravity, viscosity, and densities of the two-phase flow. The results of the analysis relate to the viscous, the transition, and the fully turbulent regimes. The transition regime is verified with extended laboratory experiments. Then, these conditions are used as a basis for formulating a general stability criterion for loose bed hydraulics, and compared to detailed experiments involving pier and square elements located either at the channel side or at its axis. In addition, a generalized densimetric particle Froude number is introduced that accounts for both uniform sediments and mixtures. The engineering application of the present results is straightforward, given that basic parameters of hydraulics, sediment, and fluid are involved. Show more
Publication status
publishedExternal links
Journal / series
Journal of Hydraulic EngineeringVolume
Pages / Article No.
Publisher
American Society of Civil EngineersOrganisational unit
03820 - Boes, Robert / Boes, Robert
More
Show all metadata
ETH Bibliography
yes
Altmetrics