The hydraulic jump downstream gates leads to increase the length of stilling basin for protection hydraulic structures from failures. In this paper, a new technique to increase energy dissipation between upstream and downstream through vertical gate with submerged hydraulic jump using a cylinder putting in pool is locating on stilling basin. This cylinder has different openings in solid and hollow cylinder with constant diameter and different heights. The results showed that in case of solid cylinder, the relative total energy dissipation is directly proportional to the initial Froude number and inversely proportional to the upstream and sequent Froude number. And vice versa in case of hollow cylinder, i.e. the relative total energy dissipation is inversely proportional to the initial Froude number and directly proportional to the upstream and sequent Froude number. Also, the maximum values of relative total energy dissipation occur when all the openings are open but the minimum values of it occurs when all the openings are close. Regardless of whether the cylinder is solid or hollow. Finally, in case of hollow cylinder, the relative height 2.4 gives the maximum values of relative total energy dissipation but the value of 1.0 gives the minimum ones. The main output of this paper that presence of openings in the cylinder has a clear effect on the energy dissipation. |
