How does water erode the soil? - PowerPoint PPT Presentation

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How does water erode the soil?

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Title: How does water erode the soil?


1
How does water erode the soil?
  • Rain uses gravity as a force to move soil.
  • Flash flooding and runoff of water causes erosion

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Processes of Water Erosion
  1. Sheet erosion -
  2. Rills (tiny streams)
  3. Gullies (trenches)
  4. Transports sediments for deposits.

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What is Mass Movement?
  • The transfer of rock and soil down-slope due to
    gravity

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Triggers of Mass Movement
Water Heavy rains and rapid melting of snow
Oversteepened Slopes The steeper the slope the greater the chance for movement
Removal of vegetation Roots keep the soil intact. Removing plants causes erosion
Earthquakes Aftershocks dislodges rocks
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Classification of Mass Movements
  • Rockfalls occurs when rocks or rocks fragments
    fall freely through the air.
  • Avalanches
  • extremely rapid movement of earth material or snow

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  • Slides
  • A block of material moves suddenly along a flat,
    inclined surface.Slides that include segments of
    bedrock are called rockslides.
  • Slumps
  • The downward movement of a block of material
    along a curved surface.

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  • Flows
  • contain a large amount of water.
  • Mudflows move quickly and carry a mixture of
    soil, rock, and water
  • Earthflows move relatively slowly and
    carryclay-rich sediment.

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  • Creep is the slow, downhill movement of soil and
    regolith.

8
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