Hydraulics of skimming flows over stepped channels and spillways
- 1 May 1994
- journal article
- research article
- Published by Taylor & Francis Ltd in Journal of Hydraulic Research
- Vol. 32 (3), 445-460
- https://doi.org/10.1080/00221689409498745
Abstract
Stepped chutes have become recently a popular method for discharging flood waters. The steps increase significantly the rate of energy dissipation taking place on the spillway face and reduce the size of the required downstream energy dissipation basin. This paper reviews the hydraulic characteristics of skimming flows. The onset of skimming flows is discussed. New results are presented to estimate the flow resistance along stepped chutes. The study indicates some major difference between the flow patterns on steep and flat stepped chutes. An analogy with flow over large roughness is developed. Then the calculations of the start of air entrainment are detailed. The results indicate that free surface aeration occurs much more upstream than on smooth spillways. The effects of flow aeration are later discussed.Keywords
This publication has 22 references indexed in Scilit:
- Energy Dissipation on Stepped SpillwaysJournal of Hydraulic Engineering, 1993
- Hydraulics of steeppass fishwaysCanadian Journal of Civil Engineering, 1991
- Ecoulement et dissipation sur les déversoirs en gradins de gabionsLa Houille Blanche, 1991
- Skimming Flow in Stepped SpillwaysJournal of Hydraulic Engineering, 1990
- HYDRAULICS OF A LARGE CHANNEL PAVED WITH BOULDERSJournal of Hydraulic Research, 1979
- Resistance Of Two Dimensional Triangular RoughnessJournal of Hydraulic Research, 1977
- Rough wall turbulent boundary layersJournal of Fluid Mechanics, 1969
- Some Properties of Turbulent Separated FlowsPhysics of Fluids, 1967
- Some roughness-concentration effects on boundary resistanceLa Houille Blanche, 1964
- Three-dimensional flow in cavitiesJournal of Fluid Mechanics, 1963