Author(s): K. A. Mazurek; B. Gautam; Md. R. Ahsan
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Keywords: No Keywords
Abstract: This paper presents some results of two experimental studies on how submergence, or tailwater depth, affects scour by plane wall jets in cohesionless material and the jet behavior. In the first study, the effects of submergence on the flow regime, time development of the scour, and size of the scour holes at asymptotic state were assessed. In the second study, the characteristics of the jet flow in scour holes created under varied submergence was examined. Three regimes of jet behavior were seen with varied submergence that were similar to those described by Johnston (1990): a bed jet regime, a surface jet regime; and a bed-surface jet regime. Scour holes created for a jet in the surface jet regime were longer and shallower than those created by the bed jet. It is also seen that the bed jet regime shows a similar behavior to a wall jet on a smooth bed, while the surface jet regime shows a jet behavior similar to a free jump.
Year: 2009