Velocity Measurements in Highly Aerated Flow on a Stepped Chute without Sidewall Constraint Using a BIV Technique

The lack of sidewalls in a spillway leads to lateral expansion the flow and, consequently, non-uniform transversal rate distribution along chute. present work shows velocity field measured physical model 1 V:0.8 H steeply sloping stepped without sidewalls. An application Bubble Image Velocimetry (BIV) technique self-aerated region is shown, using air bubbles entrained into downstream inception point as tracers. results indicate that, for small dimensionless discharges and sufficiently inception, free-surface compares relatively well with corresponding air–water interfacial previously obtained double-tip fiber optical probe same facility. In turn, profiles normal pseudo-bottom, far point, are reasonably agreement inner part skimming flow, largest differences being verified upper near free-surface.