An unusually large isolated crescentic transverse dune.
A type of barchan
A large barchan with height >100 m (Glenn 1979) or a barchan or transverse ridge >500 m wide, often isolated from surrounding dunes (Bourke and Balme 2008 and refs therein). They can also be compound dunes consisting of superimposed barchans of different sizes (Thomas 1989, p. 248). Small barchans may develop on top of the megabarchan or downwind from the horns of the megabarchan. Some are frame dunes (Bourke and Balme 2008 and refs therein).
On Mars, the largest known simple megabarchan (~500 m tall, 6.5 km wide) is the Kaiser crater dune. Russell crater also contains a very large (~400 m tall, ~33 km wide, ~ 8 km long) barchanoid ridge (Bourke 2005; Reiss and Jaumann 2003). However, most are less than 1 km wide (Bourke and Balme 2008). Megabarchans on Earth with widths and...
KeywordsSaudi Arabia Sand Dune Transverse Ridge Crest Line Transverse Dune
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