Author(s): Zhang Wenyuan; Dawajiangcun; Gama Cizhu; Wang Zhigang; Yang Fan; Wang Ruolan
Linked Author(s):
Keywords: Bucket typed stilling pool; DG project; Prototype observation; X-shape flaring gate pier
Abstract: The DG hydropower station, among the world's highest compacted concrete dams, features a comprehensive energy dissipation system with X-shaped flaring gate pier, stepped surface, and dissipation bucket, a design subject to close performance and safety monitoring. 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 operation conditions, which combined different numbers of open gates (one, two, three, and five) with varying gate opening degrees when the upstream water level ranged from 3442.5 m to 3444.9 m. It was indicated by the comparison with the model test results 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. These findings provide valuable technical support for operating and managing the DG project, as well as for constructing similar dams.
Year: 2026