Development and Application of Energy Dissipation and Scour Protection for High Arch Dam Flood Discharge Structures

Prominent problems of high arch dam flood discharge,energy dissipation and scour protection are discussed in this paper.High arch dams are usually situated in narrows gorges and their flood discharge and energy dissipation are characterized by high drop,large flow and great power.Through scientific study,the problems of flood discharge and energy dissipation can be properly solved by adoption of comprehensive treatment measures withdispersing flood discharge,reducing impact force of flow load and reinforcement of river bed to increase its scour resistance.It is suggested to adopt overflow spillway openings with differential flip buckets with deflect dents,two levels of spillway openings to have their flood jets impact each other and plunge pool as typical arrangement for flood discharge and energy dissipation.Practice demonstrates that the above scheme is reliable and achieves good results in energy dissipation.