Erosion
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Bernard Nebel.
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Erosion occurs in several steps (see text):
- Splash erosion: Rain drops falling on bear soil break up and scatter fine particles of soil as seen in the central portion of this video:
(Ignore the lecture portion which is in a foreign language.
Note also how soil is protected by a vegetative or mulch cover.
Also: type into your browser: splash erosion images
With any slope at all, soil is washed away resulting in sheet, rivulet, and gully erosion
- Sheet erosion: Sheet erosion is often evidenced by small stones sitting on “pillars” of soil. See: https://www.flickr.com/photos/soilscience/5097649016
(Ask students to explain how this comes about. Answer: Stones have protected underlying soil from the impact of rain drops. The soil between pillars has washed away. Visualize the amount.)
- As water runs off soil it gathers into larger and larger rivulets and waterways leading to rivulet and gully erosion.
Rivulet erosion, See: https://www.alamy.com/stock-photo-erosion-channels-in-a-field-banking-in-sanlucar-la-mayor-andalucia-37581633.html?
Gully erosion: Type into your browser: gully erosion images
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