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Unformatted text preview: overland flow movement of water over slopes when precipitation intensity exceeds the soil infiltration capacity according to soil porosity and permeability, vegetation, slope gradient, antecedent moisture and seasonal factors (e.g. ice) o shallow overland flow (sheet flow) on smooth slopes is laminar (layered), so particles can only be displaced but not suspended o erosion is accentuated by raindrop impact, rainsplash erosion, surging of the overland flow as small vegetation or soil dams break, and by turbulence 4. rill erosion o overland flow deepens downslope, reaching a critical depth where laminar flow cannot be maintain and turbulence begins to develop o turbulent eddies suspend soil particles, creating rills 5. subsurface erosion piping formation of natural pipes as interflow and baseflow erode macropores and fractures in fine sediments sapping collapse of the roof of a pipe to form a gully...
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This note was uploaded on 12/15/2011 for the course GLY GLY100 taught by Professor Jaymuza during the Fall '10 term at Broward College.
- Fall '10