Surface Roughness with Erosion of Earth Channelsby Gregory J. Hanson, USDA, ARS, United States,
Abstract: A determination of the stresses effective in soil detachment is essential in determining erodibility. The soil roughness that exists during testing and in natural channels is a key element in determining these stresses. The variance of the bed elevation is used as a measure of this roughness and is compared to the classical absolute roughness value, Manning's n, determined from flow characteristics.
Subject Headings: Hydraulic roughness | Soil stress | Flow measurement | Effective stress | Erosion | Fluid flow | Soil tests | Channel flow
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