• Henrik HargitaiEmail author
Living reference work entry


Longitudinal sharp-crested sinuous linear sand dune.




Large, sharp-crested, elongated, longitudinal (linear) dune or chain of sand dunes, oriented parallel to the prevailing wind direction. It consists of a succession of curved slip faces produced by strong, but infrequent crosswinds. They have sharp but sinuous/tortuous crest lines with narrow, reversing slip faces (Bagnold 1941). This sinuous ridge rises and falls at regular intervals to form a series of peaks and saddles that gives the appearance of a chain of “teardrops” when viewed from the side, especially for highly sinuous seifs (Pye and Tsoar 1990).


Seif dunes form and elongate downwind under a bidirectional wind regime (Bagnold 1941, p. 224) in the direction of the resultant of the two main wind directions (Tsoar 2008). There are parts of the dune where...


Sand Dune Crest Line Main Wind Direction Transverse Dune Linear Dune 
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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Planetary Science Research GroupEötvös Loránd University, Institute of Geography and Earth SciencesBudapestHungary