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建議的明渠不稳定流水位計算經驗方法包括起始断面中水位计算和下游河道中水位計算等两部分。起始断面中根据流量过程线的不同类型,给出了八种型式计算水位变化的經驗公式。对于下游河道,建議了对任一河段已知入流断面水位过程线的条件下,計算出流断面水位过程线的經驗方法。用建議的方法对两个河道做了计算。所得成果与实測资料极为接近。与现有的经验方法比較,本文建議的方法比較深入全面地反映了明渠不稳定流物理现象的实質,基本上包括了各种可能的流量过程线的典型情况。本方法运用簡便,精度较高,可以满足实际工程的要求。
The proposed open channel unsteady flow calculation method includes the calculation of the water level in the initial section and the calculation of the water level in the lower reaches of the channel. According to the different types of flow process line in the initial section, eight empirical formulas for calculating water level changes are given. For the downstream channel, an empirical method to calculate the course of the water level at the cross-section is proposed under the condition that the process line of the water level at the known inflow section of either section is proposed. Calculated the two rivers using the proposed method. The results obtained and the measured data are very close. Compared with the existing empirical methods, the proposed method reflects the essence of the physical phenomena of instable flow in open channels in a more comprehensive and comprehensive way and basically includes the typical situation of various possible flow process lines. The method is simple to use and high precision, which can meet the requirements of the actual project.