Author(s): Willih. Hager Vaw

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Abstract: Although hydraulic jumps have been analysed extensively in the past both by experimental andtheoretical approaches,several questions remain still unanswered.One of a question refers topossible scale effects by which hydraulic jumps could be governed. A classical hydraulic jump corresponds to the transition from supercritical to subcritical flow in ahorizontal prismatic channel.Its inflow quantities are the inflow Froude number F₁and the inflowdepth h₁.According to the conventional approach,the tailwater depth h2 depends exclusively on F₁and h₁.Yet,as is corroborated by model tests,the sequent depth ratio Y=h2/h₁does not alwaysfollow the theoretical approach,particularly at small discharges and small flow depths h₁.This factmay be attributed to the neglect of wall friction,which may become significant for suchconfigurations.One of the purposes of this investigation is to answer the question:What is thesequent depth ratio for arbitrary inflow conditions?To study the effect of wall friction,the turbulentflow features encountered by hydraulic jumps must be analysed.Herein,the results of a recentpaper will be summarised.

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Year: 1989