عنوان مقاله [English]
Hydraulic jump has been used widely for dissipating excess energy downstream of hydraulic structures in irrigation and drainage networks. The characteristics of hydraulic jump in triangular sections have not been studied as much as those in rectangular, trapezoidal and circular sections. In this paper, the characteristics of hydraulic jump in a triangular channel with broad crested end sill is studied. The experiments are carried out in a laboratory flume of 9 m length, 0.5 m width and o.6 m height with glass side walls. Different flow discharges and sluice gate openings with issuing jet Froude number in the range of 2.5-12.5 was studied. The results showed that for a given Froude number, the required tail water depth for the triangular section is up to 70% lower than that in a rectangular section. Based on the regression analysis, several empirical equations are proposed for determining sequent depth ratio and dimensionless sill height as a function of inflow Froude number. The proposed equations can be used in designing controlled hydraulic jump in triangular sections were tail water is not adequate for a classic hydraulic jump.
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