Study on Discharge Regulation and Water Level Response Mechanism of a Super Large Cascade Hydropower Station
Received date: 2025-07-31
Revised date: 2025-10-29
Online published: 2025-12-11
A super-large hydropower station is the core hub of cascade development in the lower reaches of a large River. The research on the dynamic response mechanism of discharge regulation to the water level under the dam is of great significance to ensure the safety and ecological protection of downstream shipping. Based on the hourly flow and water level observation data under the dam section in 2023, this paper uses statistical analysis methods such as Morlet wavelet analysis to systematically reveal the spatial and temporal response coupling mechanism of the discharge of the power station and the water level variation under the dam. The results show that : (1) The water level variation of the main control section under the dam shows significant spatial and temporal differentiation characteristics. The main flood season (July-August ) is driven by flood control operation and daily regulation. The daily peak amplitude of water level is 10.94 m, and the time amplitude is 3.92 m, which is 6-19 times higher than that of the downstream reference section ( perennial backwater area ). (2) There was a significant linear positive correlation between the daily variation of discharge and the daily variation of water level (R2 = 0.83 ). The average rise of water level was about 2 m when the discharge increased by 1000 m3 / s. (3) The fluctuation of 800 m3/s can cause 1m instantaneous water level fluctuation. It is proposed that the water level fluctuation can be limited within the threshold of 1m by controlling the flow amplitude ≤800m3/h, which provides basic support for the coordinated operation of cascade hydropower stations and the comprehensive risk assessment of downstream.
LUO Gang , XIAO Xiao , WU Di , CHEN Zhi-wei , LU Jun . Study on Discharge Regulation and Water Level Response Mechanism of a Super Large Cascade Hydropower Station[J]. Journal of Changjiang River Scientific Research Institute, 0 : 0 . DOI: 10.11988/ckyyb.20250711
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