Modeling the settling and resuspension of microplastics in rivers: Effect of particle properties and flow conditions

Akdogan, Zeynep; Guven, Basak

doi:10.1016/j.watres.2024.122181

Water Research

2024

DOI: 10.1016/j.watres.2024.122181

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Modeling the settling and resuspension of microplastics in rivers: Effect of particle properties and flow conditions

Zeynep Akdogan,

Basak Guven

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Sand bed river dynamics controlling microplastic flux

Beaumont,

Ockelford,

Morris-Simpson

2024

Sci Rep

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Microplastic contamination of river sediments has been found to be pervasive at the global scale and responsive to plastic and sediment bed properties, the flow regime and the river morphology. The physical controls governing the storage, remobilization and pathways of transfer in sand bed rivers remain unquantified. This means it is not currently possible to determine the risks posed by microplastic contamination within these globally significant river systems. Using controlled flume experiments we show that sand bed rivers can store up to 40% of their microplastic load within the sediment bed indicating that these environments can act as resilient sinks of microplastics. By linking bedform dynamics with microplastic transport characteristics we show that similarities exist between granular transport phenomena and the behavior, and hence predictability, of microplastic flux. Specifically, we demonstrate the inverse relationship between bedform celerity and microplastic retention within the bed can be used to predict microplastic flux. Further, we show that, in these environments, microplastic shape is more important than previously thought in controlling the fate of microplastics. Together, these findings are significant since they have important implications for the prediction and hence management of microplastic contamination in sand bed environments.

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Sand bed river dynamics controlling microplastic flux

Beaumont,

Ockelford,

Morris-Simpson

2024

Sci Rep

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Modeling the settling and resuspension of microplastics in rivers: Effect of particle properties and flow conditions

Cited by 1 publication

References 54 publications

Sand bed river dynamics controlling microplastic flux

Sand bed river dynamics controlling microplastic flux

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