Sophisticated stage-discharge rating curves for radial gates are essential to modernization efforts in water conservancy and irrigation projects. However, it is a challenging hydraulic issue to accurately determine discharges through radial gates, especially when subjected to highly submerged flow conditions. According to the variation trend of jet Froude number and the mechanism of energy dissipation subjected to submerged flows, a new criterion was proposed to subdivide submerged flow into partially submerged and totally submerged flows. Thus, the three stage-discharge equations were developed for free flow, partially submerged flow and totally submerged flow, respectively. With the aid of the experimental data of single radial gate and the field data of multi-radial gates, the proposed discharge calibration method, referred to as the identification method, was tested and verified. The results indicated the discharge prediction accuracies were satisfactory, in which the mean absolute percentage errors were less than 10%. The proposed method is feasible and easily programmed.

弧形闸门的精密级流量等级曲线对于水利和灌溉项目的现代化工作至关重要。然而，准确地确定通过径向闸门的流量是一个具有挑战性的液压问题，尤其是在遭受高度淹没的流动条件时。根据射流弗洛德数的变化趋势和淹没流的能量耗散机理，提出了将淹没流分为部分淹没流和完全淹没流的新准则。因此，分别针对自由流，部分淹没流和完全淹没流建立了三个阶段排放方程。借助单个径向闸门的实验数据和多个径向闸门的现场数据，提出了放电标定方法，称为识别方法，经过测试和验证。结果表明，流量预测精度令人满意，平均绝对百分比误差小于10％。所提出的方法是可行的并且易于编程。