Although it has accumulative errors in the absolute elevation of vertical section, it will not affect international roughness index significantly.
该方法对绝对高程的求解存在较大累积误差，但对国际平整度指数影响较小。
The result indicates that, under the same condition of vegetation density and arrangement, when F is smaller than 12.2371, the vegetation behaves absolute erectness and the vegetation roughness coefficient and drag coefficient have no relation with F.
试验结果表明，淹没植被在植被密度和排列方式相同的情况下，若植被抗弯指数F值小于12.2371，植被呈完全刚性，植被糙率系数和阻力系数与F值无关。
Based on a series of fluid flow equations, with kinematic viscosity and absolute roughness as basic factors, several simple relations were derived to estimate flow regimes of Newtonian fluid in round pipes.
以流体流动方程为基础，以流体运动粘度和管内壁的绝对粗糙度为基本参数，导出了一组判断牛顿型流体在圆管内流动型态的简便关系式。