Laboratory study on the effect of rough bed in the stilling basin hydraulic jump characteristics

Abstract

One of the most important phenomena in hydraulic quick variable flow hydraulic jump in which the damage high energy, flow rate significantly decreases. In this study the effect of roughness and slope angle characteristics of hydraulic jump in spillway stilling basin has been investigated experimentally. For this purpose, 200 experiments land on the slopes numbers in the range of 1:1, 1:2 and 1:3 and  roughness of 11, 18 and 22 mm were used. Laboratory results showed that Froude numbers tested by reducing the amount of energy loss is higher tilt angle overflow. Compare the results on rough and smooth overflow with bed showed that the secondary depth, Froude number, hydraulic jump over the rough bed significantly reduced energy loss. Laboratory results of the present study compared with previous studies a good agreement for energy dissipation of hydraulic jump in a stilling basin is rough substrates. Finally relationships to get married depth relative energy loss in supercritical Froude number input was provided for jerks formed on the substrate roughness.