CH 7.3 Landscapes Shaped by the Wind Humid areas can resist wind because the moisture holds the soil...
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Transcript of CH 7.3 Landscapes Shaped by the Wind Humid areas can resist wind because the moisture holds the soil...
CH 7.3 Landscapes Shaped by the WindHumid areas can resist wind because the moisture holds the soil together.
Desert soils are dry and have less vegetation to hold soil in place.
South Dakota after the Dust Bowl
Remember the Dust Bowl?
South Dakota before the Dust Bowl
Saltation = jumping or skipping along the surface.
The wind moves coarse particles along the surface of a desert by saltation.
http://www.weru.ksu.edu/new_weru/multimedia/movies/dust003.mpgWatch this closeup of Saltation!
Desert Pavement = surface layers of course pebbles and cobbles that are too heavy for the wind to move.
Can these be the result of wind erosion?
The wind rarely lifts sand more than a meter above the surface of the land.
Wind Deposits: When more is LOESS.
China
Loess = windblown silt that blankets a landscape.
Loess Hills State Forest, Iowa
Loess slides!
Loess crumbles!
The problem of having loess.
Loess sinks!New Madrid Seizmic Zone
Memphis TN
Dunes occur in places where the wind encounters an obstruction.
This is a rock.
This is the Wind Direction
This is sand.
The sand builds up then slides.
http://www.fisica.ufc.br/hans/dunes.html