Dune
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In physical geography, a dune is a hill or ridge of sand, usually deposited by eolian processes (wind) or sometimes by the flow of water. Dune fields cover large parts of some deserts, and some beaches have dunes. Mars has many dunes. Sand dunes have different forms and sizes based on their interaction with the wind. Sometimes they migrate downwind.
Dune Media
- Australian outback - Australische Outback.jpg
Dune fields in the Australian desert.
- Rub al Khali 002.JPG
Sand dunes of the Empty Quarter to the east of Liwa Oasis, United Arab Emirates
- Saltation on sand dune.png
Sand hitting sand is more likely to stick; sand hitting a more coherent surface is more likely to bounce (saltation). This exacerbating feedback loop helps sand accumulate into dunes.
Isolated barchan dunes on the surface of Mars. Dominant wind direction would be from left to right.
Star dunes with a rough pyramidal shape and ridges at Great Sand Dunes National Park and Preserve
- Parabolic dune.jpg
Schematic of coastal parabolic dunes
- Libya 4608 Idehan Ubari Dunes Luca Galuzzi 2007.jpg
Reversing dune showing short minor slipface atop the major stoss (upwind) face
- 350m Düne Deadvlei Sossusvlei.JPG
Dune Nine in Sossusvlei, Namibia, is over 300m high.
- LIVER AAS UDLOEB I JULI 2012 (ubt)-002.JPG
Coastal dunes covered in grasses around the mouth of the Liver Å river in Denmark
- Newborough Dune Rejuvenation.webm
Newborough Dune Rejuvenation, Wales; video of work done by Natural Resources Wales; 2015
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