Downstream of the hydraulic structures such as; spillways, chutes, overfalls and gates, due to the high flow velocity, appropriate dissipating structures for the depreciation of excess kinetic energy and reduction of flow velocity in order to prevent the erosion and protection of the downstream hydraulic systems should be constucted. One of the most common energy dissipator structures, is the hydraulic jump-type stilling basins, in which the flow excess kinetic energy is dissipated by generation of a hydraulic jump, changing the flow regime from super- to subcritical flow. Due to the extensive use of stilling basins in hydraulic systems and irrigation and drainage networks, their study was the focus of several investigations. Stilling basins are divided into several categories based on the hydraulic application and perspective. Based on the shape of the stilling basin plan, they are divided into three groups, including rectangular ( In the present study, analytical and experimental investigations were performed to study the profile of circular hydraulic jumps on slopped beds with adverse slope. The study mainly focused on the conjugate depth ratio, relative head loss, relative length, and threshold submergence depth. In the analytical model, we applied a series of reasonable assumptions and used integral equations governing the fluid dynamics to derive relationships for the conjugate depth ratio and the relative head loss, which are applicable for both Keywords : Stilling basin, Circular hydraulic jump, Adverse slope, Conjugate depth.
