EFFECT OF CHANNEL SL OPE ON HYDRAULIC JUMP CHARACTERISTICS OVER ROUGH BED

Abstract

Hydraulic jump mainly serves as an energy dissipater to dissipate excess energy of flowing water downstream of hydraulic structures, such as spillway, sluice gates etc. Present study investigate the effect of channel slope on the characteristics of free hydraulic jump and the energy dissipation downstream the gate. Study of jump has been done upon five different slopes -0.00175, -0.00349, -0.00419 and -0.00524 including horizontal bed in two cases of rough and smooth bed. The experimental program was conducted on a rectangular flume with 4.0 m long, 30 cm wide and 40 cm deep. A series of 80 experimental run were carried out in a rectangular flume which consists of artificially roughened beds formed by placing rectangular wooden strips in specific intervals. The hydraulic parameters such as, initial water depth, sequent water depth, and flow rate were measured for different bed roughness. The analysis of experimental data showed that the Sequent depth ratio and the length of jump upon smooth bed has been less than rough bed for the same slopes and Froude numbers which decreases with increase in the slope. Also comparison with energy loss, more energy loss has occurred upon rough bed than smooth bed.