d50 is the median grain diameter for surface samples. Full grain-size distributions for field sites can be found in the study of Martin et al. (83). Farrell et al. (59) did not report a surface grain size, and Greeley et al. (57) and Namikas (58) did not report associated uncertainties. 〈zq〉 is mean saltation layer height. 〈zq〉/d50 is the ratio of saltation height to grain size. τit and u*,it are best-fit saltation impact threshold shear stress and shear velocity, respectively, for the linear flux law. CQ is the best-fit scaling parameter for Eq. 10 for each site. Included uncertainties here and elsewhere represent 1 SD.
Location/study | d50 (mm) | 〈zq〉 (m) | 〈zq〉/d50 | τit (Pa) | u*,it (m s−1) | CQ |
Jericoacoara | 0.53 ± 0.04 | 0.097 ± 0.005 | 184 ± 10 | 0.135 ± 0.015 | 0.341 ± 0.019 | 7.3 ± 0.9 |
Rancho Guadalupe | 0.53 ± 0.03 | 0.107 ± 0.005 | 202 ± 10 | 0.110 ± 0.021 | 0.300 ± 0.028 | 5.8 ± 0.5 |
Oceano | 0.40 ± 0.07 | 0.055 ± 0.004 | 138 ± 9 | 0.094 ± 0.006 | 0.277 ± 0.009 | 5.9 ± 1.0 |
Greeley et al. (57) | 0.23 | 0.050 ± 0.006 | 218 ± 26 | |||
Namikas (58) | 0.25 | 0.049 ± 0.003 | 197 ± 11 | |||
Farrell et al. (59) | 0.081 ± 0.008 |