Author(s): Jeffrey G. Bohrer; Steven R. Abt
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Keywords: No Keywords
Abstract: Plunging water jets from overtopping dams have the potential to erode and scour dam foundations. The erosive force of a plunging jet is related to jet velocity. A method was sought to predict the velocity decay of a free falling, highly turbulent, rectangular jet in a plunge pool. The jet velocity decay was determined to be a function of jet impact velocity with the plunge pool surface, jet density at impact with the plunge pool surface, the density of water, gravity, and plunge depth. Three types of jets were classified: a highly turbulent, fully air entrained, highly dispersed (Fully Developed) jet, a highly turbulent, fully air entrained, refined (Developed) jet and a highly turbulent, non-aerated (Undeveloped) jet. A model of an overtopped dam was constructed to simulate a free falling, highly turbulent, rectangular jet. Data were collected from fifty-two tests conducted at the model from which empirical equations were derived for the three jet classifications to predict jet velocity decay through a plunge pool.
Year: 1997