One of the most important topics in the study of reducing the destructive energy of the flow is hydraulic jump. Hydraulic jump control is carried out in order to reduce the damage to the downstream structures. A hydraulic jump is a type of rapidly varried flow which over short distances, changes from supercritical state to subcritical is occured. Most researchers have been trying to provide conditions for more energy dissipation by changing the design of a stilling basin. In recent years, it has been determined that divergence, the presence of roughness or the formation of slopes in the basement of stilling basin, can be effective in reducing jump dimensions and is economically feasible. In this study, the characteristics of jump and the effects of an abrupt divergence have been investigated in the presence of roughness and inverse slope. Hydraulic jump characteristics were measured in a horizontal rectangular flume, 0.4 m wide, 0.6 m deep, and 8 m long. In order to create a hydraulic jump, a sluice gate was installed at the beginning of the channel. In this study, the divergence ratio is considered in the range of , adverse slopes in the range -3% and atural rough bed conditions with 0 ? t / D 1 ? 0.9. In total, 324 experiments have been conducted in the range of Froud numbers of 4.9 to 9.5 and discharge 30 to 50 . Primary and secondary depths were measured by manual depth gauges and vloctiy profiles by pitot tube. The results indicated that the maximum decrease in the secondary depth and jump length was in model T = 2, ? = -3%, t = 2 cm and equal to 54.94% and 23.99% respectively. The energy loss in this model, also, increased by 28.57% compared to the type="#_x0000_t75" . is 0.54. The water fluctuations, pressure variations the probability of existence cavitation were studied using the piezometers, installed at the bottom of the stilling basin with a distance of 10 centimeter from each other. The measurements showed that there is no cavitation in these experiments. Keywords : Hydraulic jump, stilling basin, abrupt divergence, Adverse slope, speed profiles, secondary depth, energy loss, cavitation.
