对固定床水平管道断面的紊流速度分布进行研究。将整个断面分为弓形圆弧断面和渗流断面。弓形圆弧断面的速度分布研究基于圆形断面管道紊流理论，并且结合一定的假设数值模拟弓形圆弧断面管道的紊流速度分布规律；渗流断面的速度分布研究基于渗流理论。通过一定的边界条件将两部分断面速度分布组合成整个断面的速度分布。大量的实验证明本研究方法及程序较好地模拟了此断面的紊流速度分布。

The article divides the whole section into two sections. One is arcuate section. The other is seepage section. Water velocity distribution in circular section of pipe has been studied for a long time, and advanced theories were achieved. Based on fore theory and some tentatives, theory about distribution of water velocity in pipe of arcuate section is researched. Research of seepage section is based on seeping theory. Many experiments proved that the theory and program of this article are correct.