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Integrated numerical-physical modeling for optimizing riverbed dredging in Mixed Pumped-Storage Power Stations: a
Rui Bai1, Jiaye Li2, Yingjun Song3
1Chengdu Engineering Corporation Limited, Power Construction Corporation of China, Chengdu, 610072, China.
Scientific Reports
|June 3, 2026
Summary
Riverbed dredging significantly improves Mixed Pumped-Storage Power Station (MPSPS) operations by mitigating the pumping funnel effect. This strategy enhances pumping reliability and extends continuous operation duration for integrated clean energy bases.
Area of Science:
- Renewable Energy Systems
- Hydropower Engineering
- Environmental Engineering
Background:
- Mixed Pumped-Storage Power Stations (MPSPS) are crucial for integrating hydropower, wind, and solar energy.
- The "pumping funnel" phenomenon in lower reservoirs poses a significant operational challenge for MPSPS.
- Existing literature lacks effective engineering solutions for this phenomenon.
Purpose of the Study:
- To propose and optimize riverbed dredging as a mitigation measure for the pumping funnel effect in MPSPS.
- To evaluate the effectiveness of riverbed dredging using a case study of the Lianghekou MPSPS.
- To provide a quantitative basis for engineering design and operational scheduling of MPSPS.
Main Methods:
- Development of an integrated numerical-physical modeling approach for optimizing riverbed dredging.
- Selection of the optimal dredging scheme based on pumping-effect improvement and construction cost.
- Verification of the chosen scheme through large-scale physical model experiments of the lower reservoir.
Main Results:
- Riverbed dredging expanded the river's cross-sectional area by 15-23%.
- The strategy reduced reverse flow by 30-42% and suppressed pumping funnel depth to 65% of its original value.
- Continuous pumping duration increased by 61%, significantly enhancing system reliability.
Conclusions:
- Riverbed dredging is an effective engineering measure to mitigate the pumping funnel phenomenon in MPSPS.
- The findings provide a quantitative basis for the Lianghekou MPSPS and offer insights for similar projects.
- Optimized dredging enhances the operational efficiency and reliability of integrated clean energy systems.
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