Journal
AEOLIAN RESEARCH
Volume 7, Issue -, Pages 51-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.aeolia.2012.03.003
Keywords
Aeolian; Grain size statistics; Mass flux profiles; Inflection
Categories
Funding
- National Science Foundation, Geography and Spatial Sciences Program [0727775, 0822482]
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0822482, 0727775] Funding Source: National Science Foundation
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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. (C) 2012 Published by Elsevier B.V.
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