抛物线形断面渠道均匀流水深的近似计算公式

Approximate Formula of Uniform Flow Depth for Parabolic Cross-section Channel

针对二次抛物线形断面渠道均匀流水深计算存在的问题,采用优化拟合的方法,通过对二次抛物线形断面渠道均匀流水深计算公式的拟合,得到了表达形式简单、计算过程简捷、实用范围广、便于工程设计人员实际应用的近似计算公式。误差分析及算例计算表明,在工程实用范围内,该公式的无量纲水深最大拟合相对误差为0.257%,均匀流水深计算最大相对误差为0.513%,完全满足实际工程的水力计算及设计精度要求。

Aiming at the problem of uniform flow depth computation for quadrattc parabolm cross-section ctaannel, op- timal fitting method is adopted to approximate the formula of uniform flow depth. And the approximate formula is ob- tained, which has advantages of simple expression, implementation easily, practical scope widely and facilitating engineer for application. The error analysis and example results show that in practical engineering, the maximum relative fitting er- ror is only 0. 257%and the maximum relative error of uniform flow depth computation is 0. 513 %, which fully meets the requirements of hydraulic computation and design accuracy for actual engineering.