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本文介绍了采用同步摄影测量鼻坎挑射距离的方法和成果。认为用这种方法测量挑流水舌轨迹和射距较之以往的其它方法精度高,误差小,重复性好,并避免了人为视觉的误差,观测成果可靠。并运用这些观测成果对各家计算流速系数和挑射距离的公式进行了验证,证明用中南院(原长沙院)提出的射距计算公式和湖南院、长研院及徐秉衡等提出的流速系数计算公式的计算结果与实测值十分接近。从而扩大了这些公式的适用范围,不仅适用于中、低水头,而且可用于高水头、大单宽泄量挑流射距和冲刷坑最深点位置的计算。
This article describes the methods and results of using synchrotron radiation to measure the distance of nose shot. It is considered that using this method to measure the trajectory and distance of the pick-up water tongue has higher accuracy, less error and better repeatability than other methods in the past, and avoids the error of human visual observation, and the observation result is reliable. The results of these observations are used to verify the formulas for calculating the velocity coefficient and the shooting distance. It is proved that the formula of the shooting distance proposed by Zhongnan Academy (formerly Changsha Institute) and the velocity coefficient proposed by Hunan Institute, Changyuan Institute and Xu Bingheng Calculation formula is very close to the measured value. Thus expanding the scope of the application of these formulas, not only for medium and low head, but also for high-head, large single-wide relief flow and the largest scour pit pit calculation.