Table 2 Comparison of linear and nonlinear 3/2 flux law fit values for the three field sites.

Uncertainties for fit values—scaling parameter C and impact threshold shear stress τit—are expressed as ±1 SD. d50 is the median grain diameter for surface samples, and Embedded Image is the normalized mean-squared difference between best-fit and observed values of saltation flux Q.

Sited50
(mm)
Linear: Q = C(τ − τit)Nonlinear 3/2: Q = Cu*(τ − τit)
C
(s × 103)
τit
(Pa)
Embedded ImageC
(m−1s2 × 103)
τit
(Pa)
Embedded Image
Jericoacoara0.53 ± 0.04259 ± 160.135 ± 0.0152.59480 ± 430.119 ± 0.0113.56
Rancho Guadalupe0.53 ± 0.03178 ± 140.110 ± 0.0210.51303 ± 350.080 ± 0.0250.44
Oceano0.40 ± 0.07165 ± 60.094 ± 0.0062.04359 ± 190.084 ± 0.0052.62