【摘要】 基于矩形明渠均匀流方程的渐近解 ,通过线性耦合并构造残差的有理分式逼近函数 ,提出了一种渐近耦合法用于建立矩形明渠均匀流方程的近似算式 该算式便于直接计算 ,适用范围广 ,在定义域内的精度可达 10 -4 通过基本方程变形 ,还提出了另外一种形式略微复杂但精度可达 10 -8的近似算式更多还原

【Abstract】 According to the asymptotic solution of uniform flow equations for rectangular open channels,througn linear coupling and constructing rational fraction approaching function for residual,a asymptotic coupled method for constructing approximate formula of uniform flow equation of rectangular open channels is presented.The formula is simple in form.And its precision in the whole domain is within 10 -4 .Through transforming the original formula,another approximate formula with a slightly complex form is also presented,however its precision is within 10 -8 .更多还原