Study on the impact of hydraulic characteristics of new stilling pool in the context of energy conservation, emission reduction, and green construction

In the context of peaking carbon dioxide emissions and carbon neutrality, the construction of hydropower projects has strict regulations on the demand for construction materials, which also puts forward new requirements for design organizations. Several power stations have successfully applied spillway and floodway double-discharge building shared stilling pools as the new requirements of the design program. By the stilling pool, we mean it is an energy dissipation facility that generates a bottom-flow water jump downstream of the discharge structure. However, this type of program will be due to the uneven distribution of the flow of the double building problems, leading to its flow pattern being too complex and stilling pool dissipation characteristics being unclear. For this reason, based on the hydraulic model test method, this paper studies and analyzes the hydraulic characteristics of the new type of stilling pool in the shared stilling pool scheme of the double-drainage structure when the flood relief hole is needed to dominate the flow in particular circumstances. For the problems exposed during the test, three auxiliary dissipation schemes were added to the stilling pool, and their influence on the hydraulic characteristics of the stilling pool was studied. The results show that the baffle block can effectively reduce the stilling pool's bottom flow velocity and improve the stilling pool's water flow pattern compared with other programs. The dissipation effect is better than other schemes. The related research can provide technical support for further engineering applications of the double-drainage structure shared stilling pool program.