Fig. 4From: Transport and retention of micro-polystyrene in coarse riverbed sediments: effects of flow velocity, particle and sediment sizesComparison of PS retention profiles of the particle Size Class from 100 to 250 μm. Note that y-axis is log scaled. Below a particle abundance of 0.023 (area highlighted in light grey), the observed change in particle abundance with increasing depth partly deviates from the exponential model assumptionBack to article page