Author(s): Wenyuan Zhang; Jiangcun Dawa; Cizhu Gama; Zhigang Wang; Fan Yang; Ruolan Wang

Linked Author(s): Fan Yang

Keywords: Bucket typed stilling pool; DG project; Prototype observation; X-shape flaring gate pier

Abstract: DG Hydropower Station is one of the world's highest-altitude roller-compacted concrete dams. It employs a flood energy dissipation technology combining X-shaped flaring gate piers, stepped spillway surfaces, and a bucket-type plunge pool. Its operational effectiveness and safety have attracted widespread attention. From 2021 to 2023, the prototype observations were conducted on various parameters including water flow state, dynamic water pressure, water flow velocity and water flow cavitation noise under a range of operati conditions which combined different numbers of, with varying opening when the ng , gates gate s upstream water level ranged from 3442.5 m to 3444.9 m. A substantial amount of valuable prototype observation data was obtained and compared with the results of model tests. It was indicated that the inflow in the reservoir area was stable, the overall shape of the water tongue at the wide tail pier was good, the energy dissipation of the bucket pool was sufficient, and the outflow at the tail ridge of the bucket pool was smoothly connected to the downstream river channel. The prototype water flow state, pressure, and velocity distribution were basically consistent with the results of the model test. The stepped spillway surfaces exhibited relatively severe damage at the structural joints of the dam. Their air-entrainment and erosionreduction characteristics required further verification and analysis.These findings provide valuable technical support for operating and managing the DG project, as well as for constructing similar dams.

DOI: https://doi.org/10.64697/iahr.proc.hic2026.39

Year: 2026