Summary
This paper presents the first observation-based estimate of net plastic transport on a daily timescale in tidal rivers, using a novel Eulerian approach applied to the Saigon River in Vietnam. The authors found that plastic transport is decoupled from water flow dynamics, with net plastic transport (20–33%) exceeding net discharge (16%), suggesting that factors beyond hydrodynamics—such as riparian vegetation, riverbank characteristics, and bi-directional flows—govern plastic retention and transport in estuarine systems. The findings indicate that current models of riverine plastic export to oceans may significantly underestimate retention in tidal environments.
UK applicability
The United Kingdom has numerous tidal rivers and estuaries (e.g. Thames, Severn, Mersey) where similar plastic retention dynamics may occur. The methodology and findings could inform UK environmental monitoring programmes and inform estimates of plastic pollution in UK coastal waters, though specific hydrodynamic validation in British estuarine conditions would be required.
Key measures
Net plastic transport as a percentage of total plastic transport (20–33%); net discharge (16%); Pearson correlation coefficient between plastic transport and river discharge (R² = 0.76)
Outcomes reported
The study measured net plastic transport on a daily timescale in a tidal river using sub-hourly observations across full tidal cycles. The research quantified the relationship between plastic transport and river discharge, and showed that net plastic transport represents only 20–33% of total plastic transport despite being higher than net water discharge.
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