Abstract: By comparative studies, a pattern of flood release with the combination of surface holes and middle holes was adopted for Longkaikou project. The energy dissipation scheme of surface hole outlets was slotted bucket with diversion teeth and the flip buckets of tongue-type. The type of middle hole outlets was slit-type buckets. In experiments, the jet flow from every outlet was plunged into the downstream water of different locations, the slit-type bucket jets were pull apart in the downstream direction, and the energy was dissipated partitioned. This flood release pattern and the energy dissipators would make full use of the limited width of downstream area and take full advantage of the downstream water to solve the problem of energy dissipation. Moreover, all holes can be operated relatively independently, which makes the operation scheduling and maintenance flexible. And the study can be referenced in the design of energy dissipation structure of similar projects.

Key words: Longkaikou hydropower station, flood-releasing energy dissipation, ski-jump energy dissipation, dentated sill and tongue-type flip bucket

摘要： 通过方案比较研究，龙开口水电站采用表孔、中孔联合泄洪方式，表孔“大差动+舌形坎”与中孔窄缝挑流消能方案，各孔挑流水舌分散入水、纵向拉开，充分利用下游消能水体，弥补了下游消能区宽度有限的不足，解决了下游消能问题。另外各孔口相对独立，运行调度及检修灵活方便。研究成果对同类型工程的泄洪消能设计有一定的借鉴意义。

关键词: 龙开口水电站, 泄洪消能, 挑流, 大差动+舌形坎