为研究标准Ⅰ型马蹄形断面正常水深、弗劳德数和收缩断面水深的计算方法，根据明渠均匀流理论、明渠恒定非均匀流理论和能量方程，分析了标准Ⅰ型马蹄形断面的水力特性，提出了3种工况下的正常水深与流量关系、弗劳德数，以及2种工况下收缩断面水深的迭代计算公式，并通过算例给出了解题过程。研究成果计算简单、精度高，可以应用于实际工程。
The present study aims to research the calculation method of normal water depth,Froude number and contracted section’s water depth in standardⅠ-type horseshoe cross section. On the basis of the theories of uniform flow and non-uniform flow in open channel and the energy equation,hydraulic characteristics of standardⅠ-type horseshoe cross section are analyzed. Iterative calculation formulas of the relationship between normal water depth and flow,Froude number under three conditions and water depth of contracted section under two conditions are put forward. The calculating process is illustrated by examples. The calculation method is simple and convenient with high precision,hence can be applied to engineering practice.
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