Estimating flow resistance in steep slope rills

Recent research recognized that the slope of 18% can be used to distinguish between ‘gentle slope’ case and ‘steep for detected differences in hydraulic variables (flow depth, velocity, Reynolds number, Froude number) those representatives sediment transport capacity, actual load). In this paper, using previous measurements carried out mobile bed rills flume experiments characterized by steep slopes (i.e., greater than or equal 18%), a theoretical rill flow resistance equation estimate Darcy-Weisbach friction factor is tested. The main aim deduce relationship velocity profile parameter Γ, channel slope, number textural classes data base wide range conditions, plot (18%–84%) (clay ranging from 3% 71%). obtained also tested 47 experimental runs present investigation with incised 18%—sloping clay loam soil literature data. analysis demonstrated that: (1) texture affects Γ law (Equation 25), (2) proposed Equation (25) fits well independent testing base, (3) affected particle detachability transportability (4) linearly related slope.