Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715404l&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 15, CiteID L15404
Physics
Hydrology: Sediment Transport (4558), Hydrology: Geomorphology: General (1625), Atmospheric Processes: Boundary Layer Processes
Scientific paper
The variability of the apparent von Kármán parameter $\kappa$a during aeolian saltation was evaluated in a field experiment at Jericoacoara, Brazil. To test this variability, velocity profiles, Reynolds stress and sand transport data were gathered and analyzed. We used 15 data sets with sand-laden airflow and 2 runs with clear airflow. Results indicated an inverse linear relationship between $\kappa$a and bulk, gravimetric sand concentration (R2 = 0.746) and sand transport rate (R2 = 0.577). We found values of $\kappa$a as low as 0.26. This means that using the von Kármán constant, $\kappa$ (0.40) rather than the variable $\kappa$a to estimate shear velocity based on the slope of the velocity profile will lead to over estimation of shear velocity, averaging about 20% in this study. This, in turn, produces an over estimation of wind-blown sand transport rates based on models that have terms with shear velocity cubed.
Ellis Taylor J.
Farrell Eugene J.
Li Bailiang
Sherman Douglas J.
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