Lectures Part 4

Lectures Part 4 - There are two main soil erosion...

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There are two main soil erosion processes: 1) Rain Splash and Sheetflow Erosion 2) Mass movements Keep in mind that soils naturally erode, but in some cases humans accelerate it.
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Soil or loose material transport/erosion results from particle by particle movement in the direction of the net gravity pull. In some cases soil, rock and debris can undergo mass movement (collective entrainment).
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There are three mechanisms for “collective entrainment” of soil and pedosphere that fall under the heading of mass movements : Creep (Heave) Slide Flow
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Expansion-Contraction: 1. Wet-Dry 2. Freeze-Thaw Soil Creep (unfocused)
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Effects of Creep Tilting poles Rock lines
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Effects of Creep: Hummocky topography
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There are three mechanisms for “collective entrainment” of soil and pedosphere that fall under the heading of mass movements : Creep (Heave) Slides Flows
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Slides and Flows
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Slides are focused
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Flows (focused)
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Flow – focused and very fast moving
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Slides and flows occur when: Driving Forces > Resisting Forces
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Slides and flows occur when: Driving Forces > Resisting Forces
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Slides and Flows D r iv i ng F or c e Re s t n g o in R
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Driving Force Gravity - expressed in terms of hillslope angle.
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Resisting Forces Material Strength
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internal friction,
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and particle sorting. coarse
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Lectures Part 4 - There are two main soil erosion...

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