Investigation of B-jump Negative Step in Radial Stilling Basins

Presence of steps in radial stilling basins affect positively or negatively the characteristics of the free hydraulic jumps depending upon the type of the step, the height of the step, the position of the step in the basin and the dominant flow conditions. The effects of all these factors on the characteristics of the free radial hydraulic B-jump are addressed through the present experimental investigation. It is found that the depth ratio and the length of jump ratio increase by the increase of the relative step height while the energy loss is decreased. A theoretical model for the computation of the energy loss is developed. Also, statistical models are proposed for predicting the characteristics of the formed free hydraulic B-jump at the negative step in the radial stilling basin. The experimental results are compared with the theoretical ones for energy loss and with the staistical ones for the length of jump. Good agreements are obtained between the results of the developed models and the experimental ones.