Author(s): H. Chanson
Linked Author(s):
Keywords: Keywords: stepped spillway; Flow regimes; Air entrainment; Transitionflow; Air-water flows
Abstract: The stepped channel design have been used since more than 3,000 years. It is understood that low flows behave as successions of free-jets (i.e. nappe flow) while large discharges skim over the pseudo-bottom formed by the step edges. For a range of intermediate flow rates, a transition flow regime takes place. The dominant feature is stagnation on the horizontal step face associated with significant splashing and a chaotic appearance. New criteria for the changes in flow regimes are presented. Transition flows are characterised by significant air entrainment and flow instabilities.
Year: 2001