Export of macro plastics over a tidal cycle by through small urban rivers in the amazon.

Plastic pollution in rivers has increased over the years and contributes to the pollution of the oceans. But knowledge of macroplastic flows in small, tidal-influenced urban rivers in the Amazon is still unclear, mainly due to a lack of understanding of the processes that control transport in rivers. Here, we provide the first estimate of the floating macroplastic flows in two tidally influenced urban rivers, based on continuous observations over a 12-h period.