Various empirical equations for mean bed and wall shear stresses have been proposed for smooth rectangular open channels. Considering that the distribution of bed shear and wall shear stresses is affected by the cross-sectional shape, the gravity force based on the flow depth used to non-dimensionalize shear stresses in previous studies is modified to a parameter that includes the width and wetted-perimeter. This yields a new set of dimensionless equations for mean bed and wall shear stresses, and the wall/bed shear force ratio. These equations compared well with all available experimental data over a wide range of aspect ratios from 0.31 to 50. These equations also yield new relationships for bed and wall friction factors.

对于光滑的矩形明渠，已经提出了各种平均床壁和壁面剪应力的经验方程。考虑到床层剪应力和壁面剪应力的分布受横截面形状的影响，基于流动深度的重力在以前的研究中用于无量纲化剪应力被修改为包括宽度和润湿的参数。周长。这产生了一组新的无量纲方程，用于平均床和壁剪应力，以及壁/床剪力比。这些方程与从 0.31 到 50 的宽纵横比范围内的所有可用实验数据进行了很好的比较。这些方程还产生了床和壁摩擦系数的新关系。