表面光洁度
表面粗糙度
材料科学
机械
环境科学
粗糙表面
作者
John E. Gilley,S. C. Finkner
出处
期刊:Transactions of the ASABE
[American Society of Agricultural and Biological Engineers]
日期:1991-01-01
卷期号:34 (3): 897-0903
被引量:60
摘要
ABSTRACT Random roughness parameters are used to characterize surface microrelief. In this study, random roughness was determined following six selected tillage operations. Random roughness measurements agreed closely with values reported in the literature. Surface runoff on upland areas is analyzed using hydraulic roughness coefficients. Darcy-Weisbach and Manning hydraulic roughness coefficients were identified in this investigation on each soil surface where random roughness values were determined. Hydraulic roughness coefficients were obtained from measurements of discharge rate and flow velocity. The experimental data were used to derive regression relationships which related Darcy-Weisbach and Manning hydraulic roughness coefficients to random roughness and Reynolds number. Random roughness values available in the literature can be substituted into the regression equations to estimate hydraulic roughness coefficients for a wide range of tillage implements. The accurate prediction of hydraulic roughness coefficients will improve our ability to understand and properly model upland flow hydraulics.
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