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Simulating the fate and transport of microplastics in a river corridor (Rhine River)
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Scientists studied how tiny plastic particles move through the Rhine River and found that most keep flowing downstream toward the ocean, but some get trapped along riverbanks during floods. When water levels drop after flooding, these stored plastic particles can get stirred back up into the water supply. This matters because rivers are major pathways for microplastics to reach the oceans and potentially our drinking water sources.
The extensive use of plastics has led to a widespread presence of microplastics (MPs) across various environmental compartments. Rivers and their floodplains not only play a crucial role in transporting these particles from terrestrial sources to lakes and oceans, but can also act as temporary sinks. Despite the significance of rivers as transport pathways for MPs to the ocean, our understanding of the dominant transport and retention process in river corridors is still limited. This study investigates the transport, deposition and remobilization processes of MP along a 3.5km reach of the river Rhine between Cologne and Düsseldorf, Germany. A three-dimensional hydrodynamic model with the morphological module (D-Morphology) was developed using the Delft3D FM software. Two types of microplastic particles with diameter of 0.1mm and different densities, 1030 kg/m3 Polystyrene and 1195 kg/m3 Polyvinyl Chloride (PVC) were used to assess their transport behavior under different flow scenarios. The model was calibrated against observed water levels on Manning’s roughness coefficient and subsequently validated against an independent data set. A continuous flux of microplastics at a concentration of 1μg/m³ was introduced into the hydrodynamic model at the upstream boundary.First, results indicate that advection and flow turbulence are the dominant processes governing microplastic transport. Higher discharge rates enhance microplastic transport by increasing suspended concentrations, while reducing the mass of the sedimented particles. The percentage of sedimented Polystyrene was found to be about 2.5% of total input at the end of a simulated flood event in 2021. Resuspension was found to be about 40% of the sedimented mass along the river banks and floodplain during peak flood. During the recession limb of the flood event, sedimented microplastic load increased gradually whereas suspended load decreased. Additionally, the density and size of the microplastic particles along with hydrodynamic conditions significantly influence their spatial distribution and storage within the river corridor.
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Monitoring microplastic transport in the Rhine River
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Scientists tracked tiny plastic particles flowing down the Rhine River in Germany for a year and found extremely high amounts - up to 460 tons of microplastics flowing past certain points annually. These microscopic plastic pieces come from everyday items like food packaging and clothing, and they're constantly moving from rivers into oceans where they can enter the food chain. This research helps us understand how much plastic pollution is traveling through major waterways, which is important for protecting both river ecosystems and the seafood we eat.
From source to sea: Floating macroplastic transport along the Rhine river
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Researchers tracked floating macroplastic transport along the Rhine River to understand how much land-based plastic reaches the ocean. They found that plastic transport was highly variable and linked to rainfall and flood events, with much of the plastic being retained in the river system. The study provides important data for estimating how much riverine plastic eventually enters the North Sea.
Macroplastic concentrations in the water column of the river Rhine increase with higher discharge
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Researchers used trawl nets at multiple depths in the Rhine River to track macroplastic pollution in the water column, finding that plastic concentrations rise sharply during high river discharge (flooding). During low-flow conditions, plastics accumulated near the riverbed, revealing that hydrology plays a key role in where and how much plastic moves through river systems.
A multi-method analysis of microplastic abundance in Rhine floodplains as a function of their local topography and flood frequencies
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Researchers measured microplastic abundance in Rhine River floodplain sediments at different distances from the river and at different times relative to flood events. Flooding was found to both deposit and remobilize microplastics across floodplains, creating complex spatiotemporal patterns. The study highlights that floodplains are important temporary storage areas for microplastics and that flood dynamics play a major role in transporting them across river-terrestrial ecosystem boundaries.
Microplastics profile along the Rhine River
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Researchers measured microplastic concentrations along the Rhine River from source to sea, finding a downstream increase in abundance that reflected cumulative inputs from cities and tributaries, with the Rhine acting as a major conduit delivering plastics to the North Sea.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.