Table 1.

Models for sensitivity analysis.

Model set	Dependent variables	Independent variables	Error
			r2	RMSE
1	$\frac{V}{\sqrt{\Delta g{d}_{50}}}$	d50/R, λs, Dgr, Cv	0.98	0.002431
2	$\frac{V}{\sqrt{\Delta g{d}_{50}}}$	λs, Dgr, Cv	0.96	0.0567
3	$\frac{V}{\sqrt{\Delta g{d}_{50}}}$	d50/R, Dgr, Cv	0.93	0.1489
4	$\frac{V}{\sqrt{\Delta g{d}_{50}}}$	d50/R, λs, Cv	0.89	1.458
5	$\frac{V}{\sqrt{\Delta g{d}_{50}}}$	d50/R, λs, Dgr	0.85	2.3765