Microplastics and Nanoplastics

Table 1 Overview of experimental conditions. Q_mean is the average flow rate, std. is the standard deviation of Q and v_a is the average seepage velocity of each column (\({v}_a=\frac{Q_{mean}}{\theta \cdot {A}_{column}}\)). The volume of the columns is ≈1000 ml

From: Transport and retention of micro-polystyrene in coarse riverbed sediments: effects of flow velocity, particle and sediment sizes

experiment	porosity θ [−]	Q_mean [ml min⁻¹]	std(Q) [ml min⁻¹]	v_a [m d⁻¹]	std (v_a) [m d⁻¹]
Q38_mGr	0.38^*	37.7	0.3	27.7	0.2
Q20_mGr	0.38^*	19.9	0.5	14.6	0.4
Q13_mGr	0.38^*	13.2	0.7	9.7	0.5
Q4_mGr	0.38	3.9	2.0	2.9	1.5
Q10_mGr_4PV	0.37	10.3	1.2	7.8	0.9
Q10_mGr_2PV	0.39	9.9	1.7	7.1	1.2
Q4_cSa	0.36	4.5	1.4	3.5	1.1
Q2_cSa	0.37	2.4	1.1	1.8	0.8
Q6_cSa_2PV	0.37	6.4	3.0	4.8	2.1
Q11_cSa_4PV	0.38	11.3	2.7	8.3	1.9

^* estimated value (average porosity of all gravel filled columns)

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