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Erosion
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WATCH ALL SLIDES

1.) BARCHAN

- most common type

- crescent-shaped

Wind direction

backslope

slip face

Slide 36

2.) PARABOLIC DUNES

2.) PARABOLIC DUNES

- crescent-shaped but with the concave side on the windward side

- usually elongated

- may develop in associated with deflation hollows

Wind direction

Slide 37

3.) TRANSVERSE DUNES

3.) TRANSVERSE DUNES

low sand ridge at right angles to the wind direction

may form because of large amounts of sand

wind

Slide 38

4.) LONGITUDINAL DUNES

4.) LONGITUDINAL DUNES

low sand ridges parallel to the wind direction

may form because of a limited amount of sand

also known as seif dunes

wind

Slide 39

Loess

Loess

Finely textured sediment wind-blown long distances

Wind-blown glacial debris formed large deposits

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