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Compound dunes are large dunes on which smaller dunes of similar type and slipface orientation are superimposed. Complex dunes are combinations of two or more dune types. A crescentic dune with a star dune superimposed on its crest is the most common complex dune.
Dunes take three general forms. Linear dunes, also called longitudinal dunes or seifs, are aligned in the direction of the prevailing winds. Transverse dunes, which include crescent dunes (barchans), are aligned perpendicular to the prevailing winds. More complex dunes, such as star dunes, form where the directions of the winds are highly variable.
Dunes have a vortex in the lee side of the dune. As the upper flow regime forms, the dunes become flattened out, and then produce antidunes . At higher still velocity, the antidunes are flattened and most sedimentation stops, as erosion takes over as the dominant process.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Transverse_dunes&oldid=963028857"This page was last edited on 17 June 2020, at 11:12 (UTC) (UTC)
Dunes There are various kinds of dune in tropical deserts. Representative dunes include dome dunes, transverse dunes , barchans , star dunes, shadow dunes, linear dunes and longitudinal dunes.
Transverse dunes run at a right angle to the prevailing wind direction. Star dunes are formed by variable winds, and have several ridges and slip faces radiating from a central point. They tend to grow vertically; they can reach a height of 500 m (1,600 ft), making them the tallest type of dune.
Transverse aeolian ridges (TARs) are visually bright features commonly found in topographic depressions on Mars. [ 1 ] [ 2 ] [ 3 ] These small-scale and relict bedforms were first seen in narrow-angle images from the Mars Orbiter Camera (MOC) [ 2 ] [ 3 ] and were called “ridges” to preserve both dunes and ripples as formative mechanisms.
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