Internal structure and surface geometry of longitudinal ( seif) dunes.

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


A mutual relationship exists between the morphology of longitudinal (seif) dunes and their dynamics and internal structure. The basic mechanism of longitudinal dune movement results from the deflection of oblique wind flow into a longitudinal flow on the lee flank. The magnitude of the longitudinal flow depends on the angle of the wind incidence with the crest line. Deposition occurs when this angle of incidence increases through meandering of the longitudinal dune crest line. After heavy rain exposed the internal structure of the dune, two kinds of depositional unit were found: the main unit forms in the meandering area on both sides of the dune; the other, secondary unit is a narrow belt on both sides and parallel to the crest line. The two units have different strikes. A model of the internal structure of a longitudinal dune has been developed from the field data. The model shows the erosional and depositional areas along this linear dune. -from Author

Original languageEnglish
Pages (from-to)823-831
Number of pages9
JournalJournal of Sedimentary Petrology
Issue number3
StatePublished - 1 Jan 1982

ASJC Scopus subject areas

  • Environmental Science (all)
  • Earth and Planetary Sciences (all)


Dive into the research topics of 'Internal structure and surface geometry of longitudinal ( seif) dunes.'. Together they form a unique fingerprint.

Cite this