EVSC 220 Lecture Notes - Lecture 5: Gully, Rill, Downhill Creep
8 Dec 2018
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Document Summary
Explain how these control can be manipulated to reduce the risk of soil erosion. Erosion processes: detachment: soil from soil column, transport: movement of soil from point of detachment (up to 100s of kms, depositions: within the source landscape or far from source area the soil. Erosion not just soil loss - actually soil redistribution, nutrients get moved around with. Bombardment of soil surface by entrained soil particles in the wind stream. Surface creep: coarse particles roll along surface. Saltation: intermediate particles bounce along the surface. Suspension: ne particles entrained in wind stream. Sheet ow: runo and entrained sediment ows as thin sheet over land. Rill erosion: owing water cuts channels of a few centimetres depth. Gully erosion: like rill erosion, but meters deep (larger version of a rill) High rates of precipitation will likely lead to exceeding the in ltration rate. Occurs whenever soil is cultivated on even a slight slope. Soil can be dragged upslope or downslope.
