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由于U型渠道具有水力条件优越、占地面积小、抗冻胀性能好等优点而被广泛应用于斗渠及其以下田间工程中。在U型渠道测流时,通常要确定U型渠道的过水断面面积。U型渠道过水断面面积的计算有两种,一是精算法:即将U型断面分成圆弧底、直线段梯形两部分,分别计算后相加;由于这种计算方法比较繁琐,于是人们普遍采用第二种算法,即近似法:就是把U型断面近似看作抛物线形,
U-shaped channels are widely used in ditches and the following field projects due to their advantages of superior hydraulic conditions, small footprint and good anti-frost heave performance. U-channel flow measurement, usually to determine the U-channel cross-section area. There are two kinds of calculation for the area of the U-shaped channel cross-section area. One is the refined algorithm: the U-shaped section is divided into arc base and straight trapezoid two parts and added after calculation respectively. Because of this calculation method is complicated, people are generally The second algorithm, the approximation method, is to approximate the U-section as a parabola,