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Aeolian saltation threshold: the effect of density ratio
Author(s) -
IVERSEN JAMES D.,
GREELEY RONALD,
MARSHALL JOHN R.,
POLLACK JAMES B.
Publication year - 1987
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1987.tb00795.x
Subject(s) - dimensionless quantity , mechanics , geotechnical engineering , aeolian processes , geology , wind tunnel , wind speed , geomorphology , physics , oceanography
Saltation threshold data from three wind tunnels and from hydraulic flumes are presented to show that the dimensionless threshold friction speed for small particles is a continuous function of particle‐to‐fluid‐density ratio. In addition, the dimensionless threshold speed is a function of the grain‐friction Reynolds number and an interparticle force term. The variation with density ratio seems to be due to the relative energy with which particles impact other particles to initiate saltation.