Hydraulics of skimming flows over stepped channels and spillways: Hydraulique des écoulements extrémement turbulents sur des canaux en marches d’escalier

Chanson H. (1994) Hydraulics of skimming flows over stepped channels and spillways: Hydraulique des écoulements extrémement turbulents sur des canaux en marches d’escalier. Journal of Hydraulic Research, 32 3: 445-460. doi:10.1080/00221689409498745


Author Chanson H.
Title Hydraulics of skimming flows over stepped channels and spillways: Hydraulique des écoulements extrémement turbulents sur des canaux en marches d’escalier
Journal name Journal of Hydraulic Research   Check publisher's open access policy
ISSN 0022-1686
Publication date 1994
Sub-type Article (original research)
DOI 10.1080/00221689409498745
Volume 32
Issue 3
Start page 445
End page 460
Total pages 16
Subject 2205 Civil and Structural Engineering
2312 Water Science and Technology
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 26 Jul 2016, 03:05:02 EST by System User