Experimental Study on Measurement of Drag Coefficient of Sandy Soil Nonlinear Vadose

Table 5

Comparison of fitting results between common seepage formulas and standard sand seepage experiment data.

Particle size range (mm)	N	CU	CC	Correlation comparison ()
				The formula of this paper	Ergun	Van Gent	Liu	Jingsui Wu	The formula of this paper
0.1–0.25	0.381	1	1	0.943	−2.047	−9.106	0.583	−1.715	0.943
	0.455	1	1	0.982	−3.361	−7.231	−0.056	−2.544	0.982
	0.449	1	1	0.978	−2.028	−5.398	0.320	−1.478	0.978
0.25–0.5	0.381	1	1	0.404	−2.969	0.479	−0.827	−1.942	0.053
	0.381	1	1	0.219	−2.570	0.799	−0.724	−1.905	0.005
	0.402	1	1	0.590	−1.921	0.585	−0.368	−1.140	0.333
0.5–1	0.361	1	1	−4.672	−1.380	−30.410	0.694	0.090	0.189
	0.374	1	1	−0.157	−1.677	−10.853	0.737	0.897	0.966
	0.381	1		−2.131	−2.126	−18.772	0.825	0.783	0.629
1–2	0.348	1	1	0.030	−2.112	−6.435	0.595	−0.195	0.894
	0.361	1	1	0.154	−1.824	−3.976	0.529	0.063	0.902
	0.377	1	1	0.334	−2.083	−3.630	0.484	0.556	0.838
2–5	0.344	1	1	−0.213	−2.158	−5.067	0.551	−2.059	0.853
	0.353	1	1	−0.011	−2.137	−4.556	0.527	−1.136	0.820
	0.381	1	1	−0.134	−2.335	−5.394	0.509	−0.140	0.819
0.1–5	0.314	6	0.75	−1.907	−2.072	0.536	−0.240	0.187	0.929
	0.314	5.5	1	−2.093	−2.281	0.490	−0.321	0.181	0.963
	0.314	6	1	−1.573	−1.704	0.323	−0.016	0.377	0.909
	0.314	6	1	−2.169	−2.303	0.838	−0.530	−0.066	0.952
	0.314	6.25	1	−2.179	−2.289	0.887	−0.585	−0.194	0.951