sand roughness

The roughness of the bed varies from 0.013 to 0.021, gradually increasing as the sand ripple's development.

床面糙率值为0.013~0.021，并随着沙波发育逐步增大。

The calculated results show that the effect of the moving sand in the fluid outside the region to which saltation is confined, is similar to that of solid roughness, and the effective roughness can be depicted as the quadratic function of the friction velocity of the wind.

结果表明，跃移沙粒对风速的影响类似于床面粗糙度的影响，有效粗糙度随摩阻速度的变化关系可用二次函数表征；

As far as the single factor is concerned, the optimal level of surface roughness is burnished by sand paper ( 0.045-0.055mm).

就单一因素的影响来看，表面粗糙度的最优水平为采用280～320~（0.045～0.055mm）砂纸打磨；

The concept "aerodynamic roughness length" defined by Bagnold is an important parameter for wind erosion research. It has been widely applied in sand bed, vegetation conditions, snow bed and water surface.

由Bagnold提出的空气动力学粗糙度概念，是描述各种表面空气动力学特征的重要参数，已被广泛应用于沙面、植被覆盖表面、雪面、水面等。

Factors Influencing the Surface Roughness of Cold-setting Resin Sand Aluminium Castings

冷硬树脂砂铝铸件表面粗糙度影响因素的研究