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Journal: Journal of Hydraulic Engineering

Abbreviation

J. Hydraul. Eng.

Publisher

American Society of Civil Engineers

Journal Volumes

ISSN

0733-9429
1943-7900

Description

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Publications 1 - 10 of 145
  • Transcritical Flow in Open Channel Hydraulics: From Böss to De Marchi
    Item type: Journal Article
    Hager, Willi H.; Castro-Orgaz, Oscar (2016)
    Journal of Hydraulic Engineering
  • Numerical modeling of breach erosion of river embankments
    Item type: Journal Article
    Fäh, Roland (2007)
    Journal of Hydraulic Engineering
  • Formation and effects of alternate bars
    Item type: Journal Article
    Jäggi, Martin N.R. (1984)
    Journal of Hydraulic Engineering
    Major river regulation works have often resulted in alternate bar formation. Experimental work is described which provides more information on this phenomenon. Alternate bar formation is closely associated with meandering, inferring that alternate bar formation is caused by flow induced periodic disturbances of the horizontal velocity profile. Based on these considerations a criterion has been developed which defines the upper limit of alternate bar formation, and this has been satisfactorily compared to other formation criteria and experimental data. The lower limit is given by the initiation of bedload transport. A simple relation between slope, channel width and grain size is then deduced to indicate whether for a given channel, alternate bars can develop for any discharge. This relation takes into account armoring effects. Another equation is proposed to predict the scour depth resulting from alternate bar formation. Such scour often induces costly river maintainance works. Finally, some interesting results on flow resistance have been found, leading to a tentative equation for the intermediate roughness range.
  • Discussion of “Experimental Study of the Flow Field over Bottom Intake Racks” by Maurizio Righetti and Stefano Lanzoni
    Item type: Other Journal Item
    Hager, Willi H. (2009)
    Journal of Hydraulic Engineering
  • Undular hydraulic jumps in circular conduits
    Item type: Journal Article
    Gargano, Rudy; Hager, Willi H. (2002)
    Journal of Hydraulic Engineering
    Undular hydraulic jumps in circular conduits are considered with an experimental approach. Based on previous findings in rectangular channels, this research indicates differences in terms of shape effects. All present results depend on the filling ratio of the upstream conduit flow in addition to the upstream Froude number. The results include information on the wave crests and troughs, wave lengths, and generalized axial surface profiles. The wall surface profile is shown to be similar to the axial wave profile, but with smaller wave extrema and a wave shift. The design of conduits containing undular jumps should be avoided because of unstable flow. It is also demonstrated that conduits may choke in the presence of undular jumps, with a previously established choking number relating to a design limit. For flows with choking numbers in excess of 1, choking occurs associated with a transition from the free surface to the pressurized conduit flow.
  • Closure to “Hydraulic Design of Stepped Spillways”
    Item type: Journal Article
    Boes, Robert; Hager, Willi H. (2005)
    Journal of Hydraulic Engineering
  • Two-phase flow characteristics of stepped spillways
    Item type: Journal Article
    Boes, Robert; Hager, Willi H. (2003)
    Journal of Hydraulic Engineering
  • Vortex drop inlet for supercritical approaching flow
    Item type: Journal Article
    Hager, Willi H. (1990)
    Journal of Hydraulic Engineering
    The inlet of vortex drops for supercritical approaching flow is discussed. Based on detailed experimental observations collected at various inlet geometries, the shape of vortex inlet was optimized. The geometry recommended is of spiral shape, and depends mainly on the shaft radius and on the width of the approaching channel. Particular features of the inlet are its wide domain of application regarding the Froude number and bottom slope of the approaching channel, and zero transverse inlet slope. The discharge capacities of vortex drops are shown to be of the same order for both sub‐ and supercritical approach flows. Further, the surface profile along the outer guiding wall is analyzed. It is found that both the Froude number of the approach flow and the radius of outer inlet wall influence significantly the maximum height of standing wave. A nondimensional surface profile along the outer wall is given, and prominent flow features in drop inlet structures are discussed.
  • Discussion of "Reanalysis and Correction of Bed-Load Relation of Meyer-Peter and Muller Using Their Own Database" by Miguel Wong and Gary Parker
    Item type: Journal Article
    Hager, Willi H.; Schmocker, Lukas (2008)
    Journal of Hydraulic Engineering
  • Chute Aerators. II: Hydraulic Design
    Item type: Journal Article
    Pfister, Michael; Hager, Willi H. (2010)
    Journal of Hydraulic Engineering
Publications 1 - 10 of 145