Vertical distribution of grain size for wind blown sand

E. J. Farrell*, D. J. Sherman, J. T. Ellis, B. Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

Grain size-sorting characteristics from twenty-five vertical, mass-flux profiles for a mixed grain population are presented from a field study conducted in Jericoacoara, Brazil. The vertical mass flux profile is best described using an exponential decay function. An analysis of the grain-size statistics shows that a reverse in grain-size trends occurs at an inflection zone located 0.05-0.15. m above the bed. Below this inflection, mean grain-size decreases steeply with elevation in the near bed region dominated by reptation and saltation modes of transport. Above the inflection there is a coarsening of grain size with elevation. Sorting improves with elevation above the surface. There is not a strong relationship between skewness and kurtosis with elevation. The grain-size inflection above the surface is a characteristic of saltation in some natural environments, with important implications for numerical modeling of grain trajectories.

Original languageEnglish
Pages (from-to)51-61
Number of pages11
JournalAeolian Research
Volume7
DOIs
Publication statusPublished - Dec 2012
Externally publishedYes

Keywords

  • Aeolian
  • Grain size statistics
  • Inflection
  • Mass flux profiles

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