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前言利用水工建筑物测流,是一个比较经济的测流手段,但因利用水力学公式直接推算出的流量系数,并非一个常数,在资料整编与推流方面都较繁琐,对利用电子技术进行堰闸流量自记和革新整编资料方法都不方便。又因流量系数与某些水力因素之间的关系有的并不太明显,因此用以探索其关系,就难以获得满意的成果。为了克服以上缺陷,现已在水力学原理基础上选取主要的有关水力因素,采用逐步图解法直接分析堰闸实测
Preface The use of hydraulic structures to measure flow, is a more economical means of flow measurement, but the direct calculation of the flow coefficient using the hydraulic formula is not a constant, the data reorganization and flow are more complicated, the use of electronic technology Weir gate traffic self-record and innovative methods of reorganizing the data are not convenient. And because of the relationship between the flow coefficient and some of the hydraulic factors is not obvious, so to explore the relationship, it is difficult to obtain satisfactory results. In order to overcome the above shortcomings, the main hydraulic factors have been selected based on the principle of hydraulics, and the direct analysis of weir gates by step-by-step graphic analysis