Definition
Straight to curvilinear longitudinal dune formed downwind of domes or barchans (Schatz et al. 2006).
Category
A type of linear dune.
Description
Linear dunes showing sharp crest intermingling with barchan dunes (Tsoar 2008).
Formation
Adjacent barchans indicate unidirectional wind regime. Their sharp crest suggests that their formation is related to terrestrial seif dunes and not linear dunes whose crest is rounded. However, terrestrial seif dunes are sinuous whereas Martian’s are rectilinear. Differences may stem from the induration of Martian dunes (Herrmann et al. 2008) either by geochemical processes or by ice. Indurated Martian barchans may function as obstacle dunes. Consequently, sand transported from upwind direction will be accumulated on the lee side as a short, linear, sharp-crested lee dune. This initial dune stabilizes in time but continues to lengthen parallel to the wind. As induration crust is removed, it disintegrates into a dune convoy (Tsoar 2008)....
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References
Herrmann HJ, Durán O, Parteli EJR, Schatz V (2008) Vegetation and induration as sand dunes stabilizators. J Coast Res 24(6):1357–1368. doi:10.2112/08A-0011.1
Schatz V, Tsoar H, Edgett KS, Parteli EJR, Herrmann HJ (2006) Evidence for indurated sand dunes in the Martian North Polar Region. J Geophys Res 11(1):E04006. doi:10.1029/2005JE002514
Tsoar H (2001) Types of aeolian sand dunes and their formation. In: Balmforth NJ, Provenzale A (eds) Geomorphological fluid mechanics. Lecture notes in physics, vol 582. Springer-Verlag, Berlin, pp 403–429
Tsoar H (2008) Linear dunes on earth and mars – similarity and dissimilarity. Planetary Dunes workshop: a record of climate change. April 29–May 2, 2008, Alamogordo. LPI Contribution No. 1403, pp 75–76
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Parteli, E.J.R. (2015). Rectilinear Dune. In: Hargitai, H., Kereszturi, Á. (eds) Encyclopedia of Planetary Landforms. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3134-3_302
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DOI: https://doi.org/10.1007/978-1-4614-3134-3_302
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Publisher Name: Springer, New York, NY
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