Erosion Gravity Wins.

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Presentation transcript:

Erosion Gravity Wins

What is Erosion? (notes) The movement of weathered material. Gravity Streams Glaciers Wind

Erosion by Gravity – Mass Wasting Inertia is the force which keeps things from wanting to move. (Friction) Gravity is the force pulling objects toward the center of the Earth. When Gravity is greater than Inertia – LANDSLIDES!!

Mass Wasting - Classification Rate of movement – how fast is it moving? Type of movement – how is it moving? Type of material – what is moving?

Soil Creep (notes) Soil VERY SLOWLY slides downhill. Not noticeable over short periods of time Areas with heavy rain storms or other disturbances.

Creeping Headstones

Earthflow (notes) Faster than creep Very wet soil = little friction between top layer of soil and bottom Top layer slides downhill

Earthflow Structure Flow Only Flow with Rotation

Mudflow (notes) Even Faster Intense amounts of water + soil and rocks = MUD Very thick liquid mixture flows downhill Very powerful, damaging

Dried Mudflow

Mudflow

A line of weakness on a slope appears Slump (notes) Happens all at once A line of weakness on a slope appears A huge block of earth slips downhill *Not good if you built your house on a cliff edge*

Rock Slide and Falls(notes) Chunks of rock break off hillside or cliff Bounce or roll down hill Caused by earthquakes, frost wedging, wave cutting, etc. DEVASTATING DAMAGE

Rock Slides and Falls

Rockfall in action

Rock Slide

Preventing Landslides

Poor Road Design

Improved Drainage Less Creep

Speed Summary CREEP EARTHFLOW MUDFLOW SLUMP ROCK FALL SLOW FAST