Abstract
Hydraulic Jump is a subjective process affected by substantive conditions; in this phenomenon part of flow kinetic energy changes into potential energy. The effect of substantive condition such as prismatic sill under sluice gate is studied experimentally by changing the sill height four times and compared with a jump without sill. The location of occurrence, total length, relative sequence depth and relative energy loss are the properties of the jump which are investigated. The investigation leads that sill under the gate increases energy loss up to 10%. The energy loss increase as sill slope increase and decreases with the increase of relative sill high to jump location. While the relative sequence depth of jump increases with increase of relative sill high to jump location and decreases with the increase of sill slope. The relative location of jump occurrence to depth of flow after the jump decreases with increase of sill slope. Within the limitations of the present experimental work, four mathematical models of relationship predicting the properties of the jump suggested with adjusted R square more than 0.921.
Highlights
Hydraulic jump is the transition phenomenon from supercritical flow to subcritical flow, which is generally observed in open channel, such as rivers and spillways
Nikmehr and Tabebordbar (2010) results showed that the sequent depth ratio and the length of the jump were greater on smooth beds than rough beds for the same slopes and Froude number and more energy loss occurred on rough beds than smooth beds
The results indicated that the sequent depth decreases 20% and the hydraulic jump length decreases 50%
Summary
Hydraulic jump is the transition phenomenon from supercritical flow to subcritical flow, which is generally observed in open channel, such as rivers and spillways. Several investigations have been carried out to determine the properties of hydraulic jump including, length of jump, the sequent depth ratio and the energy dissipation. Mohamed Ali (1991) carried a series of experiments to study the effect of roughened beds using cube blocks, Ali found that the length of hydraulic jump reduced by around 27 to 67% for a Froude number range of 4 to 10. Nikmehr and Tabebordbar (2010), studied the properties of hydraulic jump on four adverse slopes, in two cases of rough and smooth beds. Nikmehr and Tabebordbar (2010) results showed that the sequent depth ratio and the length of the jump were greater on smooth beds than rough beds for the same slopes and Froude number and more energy loss occurred on rough beds than smooth beds. For all shapes of corrugated beds, the tail water depth required to form a jump was appreciably smaller than that for the corresponding jump on smooth beds. Nikmehr and Tabebordbar (2010), studied the properties of hydraulic jump on four adverse slopes, in two cases of rough and smooth beds. Nikmehr and Tabebordbar (2010) results showed that the sequent depth ratio and the length of the jump were greater on smooth beds than rough beds for the same slopes and Froude number and more energy loss occurred on rough beds than smooth beds. Imran and Akib (2013), investigated the potential use of corrugated and roughened beds for reducing the hydraulic jump length and sequent depth, Imran and Akib (2013) found that the corrugated bed always showed better performance than a smooth bed channel in reducing hydraulic jump length and sequent depth
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