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Soil Roughness Changes from Rainfall
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1987
Year
HydrometeorologySoil ErosionMeteorologySoil Surface RoughnessRoughness Parameter REngineeringSurface RunoffDroughtErosion PredictionSoil Roughness ChangesCivil EngineeringGeographyTillage SystemsSoil PropertyTillage ToolHydrologyEarth Science
ABSTRACT CHANGES in soil surface roughness were measured for three tillage systems following the application of a series of simulated rainstorms. Tillage systems were chisel, chisel + disking, and chisel + disking + harrowing. Rain with an intensity of 50 mm-h-i and an energy rate of 0.0275 kJ-m~2 per mm of water was applied in storms of 0.3, 0.5, 0.7, 1.5, 3.0 and 6 h durations. Soil surface roughness was expressed by a parameter R which represented the effect of clod size and frequency. Roughness changes could be described by the function R = Cj + C2 exp( C3-r) where r is the cumulative rainfall. Autocorrelation analysis showed substantial variation in the spatial dependency of (a) the roughness parameter R among tillage systems and (b) the measured elevations on a transect following different rainstorm events.