Megabarchan

Living reference work entry
DOI: https://doi.org/10.1007/978-1-4614-9213-9_234-1

Definition

An unusually large isolated crescentic transverse dune.

Category

A type of barchan

Synonyms

Description

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).

Morphometry

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...

Keywords

Saudi Arabia Sand Dune Transverse Ridge Crest Line Transverse Dune 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in to check access.

References

  1. Bourke MC (2005) Alluvial fans on dunes in Kaiser Crater suggest niveo-aeolian and denivation processes on Mars. Lunar Planet Sci Conf XXXVI, abstract #2373, HoustonGoogle Scholar
  2. Bourke MC, Balme M (2008) Megabarchans on Mars. Planetary dunes workshop: a record of climate change, 29 Apr–2 May 2008, Alamogordo. LPI contribution no. 1403, pp 17–18Google Scholar
  3. Bourke MC, Goudie AS (2009) Varieties of barchan form in the Namib Desert and on Mars. Aeolian Res 1:45–54CrossRefGoogle Scholar
  4. Bourke MC, Lancaster N, Fenton LK, Parteli EJR, Zimbelman JR, Radebaugh J (2010) Extraterrestrial dunes: an introduction to the special issue on planetary dune systems. Geomorphology 121:1–14CrossRefGoogle Scholar
  5. Breed CS, Grow T (1979) Morphology and distribution of dunes in sand seas observed by remote sensing. In: McKee ED (ed) A study of global sand seas. United States geological survey, professional paper, 1052. University Press of the Pacific Honolulu, Hawaii, pp 253–304Google Scholar
  6. Claudin P, Andreotti B (2006) A scaling law for aeolian dunes on Mars, Venus, Earth, and for subaqueous ripples. Earth Planet Sci Lett 252(1–2):30–44CrossRefGoogle Scholar
  7. Elbelrhiti H, Claudin P, Andreotti B (2005) Field evidence for surface-wave-induced instability of sand dunes. Nature 437:720–723CrossRefGoogle Scholar
  8. Glenn M (ed) (1979) Glossary. In: McKee ED (ed) U.S. geological survey professional paper, 1052. University Press of the Pacific Honolulu, Hawaii, pp 399–407Google Scholar
  9. Norris RM (1968) Barchan dunes of imperial valley, California. J Geol 74(3):292–306CrossRefGoogle Scholar
  10. Reiss D, Jaumann R (2003) Recent debris flows on Mars: seasonal observations of the Russell crater dune field. Geophys Res Lett 30. doi:10.1029/2002GL016704Google Scholar
  11. Rogers D, Christensen PR (2003) Age relationship of basaltic and andesitic surface compositions on Mars: analysis of high-resolution TES observations of the northern hemisphere. J Geophys Res (Planets) 108(E4):5030. doi:10.1029/2002JE001913CrossRefGoogle Scholar
  12. Simons FS (1956) A note on Pur-Pur Dune, Virú Valley, Peru. J Geol 64(5):517–521CrossRefGoogle Scholar
  13. Thomas DSG (1989) Aeolian sand deposits. In: Thomas DSG (ed) Arid zone geomorphology. Belhaven Press, London, pp 232–261Google Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Physical SciencesThe Open University Walton HallMilton KeynesUK