Journal of Hydraulics

Journal of Hydraulics

Experimental study of skimming flow on the stepped spillway in the non-aerated area using PIV

Document Type : Research Article

Authors
Kamyab Habibi 1
Farinaz Erfani Fard 1
Seyed Amin Asghari Pari 2
1 Department of Civil Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
2 Associate Professor/ water structures département / Shahid Chamran University of Ahvaz
10.30482/jhyd.2023.418093.1677
Abstract
Understanding the flow behavior over stepped spillways has been the subject of many previous studies. Most of the studies conducted on stepped spillways have been in skimming flow conditions and the aerated parts of the spillway. Also, many of these results have been the result of observing the flow behavior on the side of the spillway, and there is still no complete view of the flow behavior in the depth of the spillway. The present study investigates the skimming flow behavior on a short and wide stepped spillway in a non-aerated area. For this purpose, the image processing technique called particle image velocimetry )PIV( has been used to process the movement path, velocity, and behavior of the flow and analyze it in the side sections and depth of the spillway. In a few previous studies, the more detailed behavior of the skimming flow has been investigated. The results of these studies have defined some of the characteristics of two sub-regimes of the skimming flow regime. However, the behavior of the sub-regimes mentioned by the researchers was mostly described as laboratory observations. This article takes a closer look at this issue. Also, in this study, it was shown that the flow behavior in the areas above the pseudo bottom line is almost similar to different cross-sections, but in the areas under the pseudo bottom line, the flow behavior experiences significant changes, so that its effects on the velocity profiles are quite evident., , , , , , , , , , , , , , , , , , ,, , , , , , , , , , , , , , , , , , ,, , , , , , , , , , , , , , , , , , ,, , , , , , , , , , , , , , , , , , ,
Keywords
Skimming flow
Stepped Spillway
Non-aerated Area
PIV

Subjects

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  • Receive Date 26 September 2023
  • Revise Date 21 December 2023
  • Accept Date 25 December 2023