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目前梯形渠道的断面尺寸设计有传统式算法,迭代计算法,图解法三种方法。由于传统试算法和迭代计算法没有定量的规律可循,计算工作量大,比较麻烦,特别是在缺乏实践经验的情况下可能会作一些不必要的试算;图解法又不太直观。为了简化计算,依据渠道均匀流的理论和数学模型,推导出一种渠道水力计算的简化方法——查表计算法,梯形渠道水力计算表(附后)。利用该表可以不通过试算而得出结果,并具有精度较高,使用方便的特点。文章除了说明如何进行查表计算外,着重阐明造表的方法和原理。
At present, the cross-sectional dimension of the trapezoidal channel has three kinds of methods: traditional algorithm, iterative calculation method and graphic method. Due to the fact that traditional trial methods and iterative methods have no quantitative rules to follow, computational workloads are large and troublesome, and some unnecessary trial calculations may be made especially in the absence of practical experience. Schematic methods are not so intuitive. In order to simplify the calculation, a simplified method of channel hydraulic calculation - look up table calculation method and trapezoidal channel hydraulic calculation table (attached) is deduced according to the theory and mathematical model of uniform channel flow. The table can not be passed through the trial and draw the results, and with high precision, easy to use features. In addition to explaining how to look up the table, the article focuses on the methods and principles of making tables.