Laboratory investigation of hydraulic jump in straight compound sections

Document Type : Original Article

Authors

1 gorgan university of agricultural science and natural resources

2 Mirdamad Institute of Higher Education

3 Water Engineering Dep, Gorgan University of Agricultural Sciences and Natural Resources

10.22125/iwe.2022.343462.1631

Abstract

Due to limited resources in the field of hydraulic jump in compound channel, this laboratory research was performed by creating a stable and symmetrical jump.

The study was implemented on an experimental channel with a length of 10 m, a width of 1 m, and a height of 0.8 m in the Hydraulics Lab at the Gorgan University of Agricultural Sciences and Natural Resources. 6 meters of the total length of the channel has been transformed into a composite channel. Also, the main cross-section and floodplains had adjustable depths and widths. The present study examined the effects of the relative width and initial Froude number. Three relative widths and three initial Froude numbers were studied in a total of nine tests. In each test, the initial Froude number was set to induce a hydraulic jump by changing the opening of the upstream opening height at a given flow rate.

The present work experimentally induced hydraulic jumps in compound open channels and quantified the physical properties of hydraulic jumps (e.g., conjugate depths and hydraulic jump length) by point velocity, flow rate, and flow velocity measurements. The results indicate that the physical and hydraulic characteristics of the observed jump are different from the classical type and the use of classical jump equations leads to error.

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