Methodology and Effectiveness of Discharge Curve Calibration of Low-head Hydraulic Projects

HUANG Yan-qin; GU Jia-li; YAO Hong-liang; CHEN Duan; HAN Ji-bin; WANG Zhi-xin

doi:10.11988/ckyyb.20250249

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Journal of Changjiang River Scientific Research Institute ›› 2025 DOI: 10.11988/ckyyb.20250249

Methodology and Effectiveness of Discharge Curve Calibration of Low-head Hydraulic Projects

HUANG Yan-qin ¹ ,
GU Jia-li ¹ ,
YAO Hong-liang ² ,
CHEN Duan ³^,⁴ ,
HAN Ji-bin ³^,⁴ ,
WANG Zhi-xin ³^,⁴

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Abstract

Based on the analysis of the causes for the discrepancies, a calibration method combining hydraulic calculation, prototype observation and numerical simulation, is proposed in order to deal with the inaccuracy of the design discharge curve. Taking a certain navigation and hydropower hub in the middle reach of the Ganjiang River as an example, prototype observation of flow rate was carried out for both flood discharge and power generation conditions. The discharge curves of the sluice are calibrated using prototype data, hydraulic calculations and three-dimensional CFD numerical simulations. The discharge curves adaptable to the changing boundary conditions are obtained for both controlled and uncontrolled flood discharge operations. It is shown that calculated power discharge is rather accurate, and the result can be used to separate power discharge and flood discharge from the total outbound flow. Calibrated discharge curves agree well with the prototype observation with deviations less than 5%, thus ready-to-use for the hub dispatching and operation. The present study can offer a reference for the analysis and calibration of the discharge curves in similar hydraulic projects.

Key words

sluice / discharge curve / prototype observation / numerical simulation / low-head hydraulic project

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HUANG Yan-qin , GU Jia-li , YAO Hong-liang , et al . Methodology and Effectiveness of Discharge Curve Calibration of Low-head Hydraulic Projects[J]. Journal of Changjiang River Scientific Research Institute. 2025 https://doi.org/10.11988/ckyyb.20250249

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