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Related Experiment Video

Updated: Sep 13, 2025

Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape
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Microfluidic Fabrication of Polymeric and Biohybrid Fibers with Predesigned Size and Shape

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Synthetic microfibers driven by turbidity currents: Transition from smooth bed to macro-roughness.

Mirco Mancini1, Marianna Soler2, Jordi Colomer2

  • 1Department of Civil and Environmental Engineering, University of Florence, Via S. Marta 3, 50139 Florence, Italy.

Marine Pollution Bulletin
|July 30, 2025
PubMed
Summary

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Competing effects of bed sediments on turbulence-driven microfiber infiltration.

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Infiltration of Microfibers in Sediment Beds in Moderate- to High-Turbulent Aquatic Environments.

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Settling velocities of microplastics with different shapes in sediment-water mixtures.

Environmental pollution (Barking, Essex : 1987)·2025

Turbidity currents transport microfibers (MFs) in aquatic environments. Bed roughness and water depth impact MF transport, with a new model predicting their movement based on environmental factors.

Area of Science:

  • Environmental Science
  • Fluid Dynamics
  • Ecotoxicology

Background:

  • Turbidity currents are key in transporting microplastics (MPs) in aquatic systems.
  • Microfiber (MF) transport dynamics are less understood due to their unique physical properties.
  • MFs pose distinct challenges in aquatic environments compared to other MPs.

Purpose of the Study:

  • To investigate microfiber transport by turbidity currents over various bedforms.
  • To assess the influence of bed roughness and water depth on MF behavior.
  • To develop a predictive model for microfiber transport.

Main Methods:

  • Lock-exchange flume experiments were conducted.
  • Experiments varied bed layer conditions (micro to macro-roughness) and water depths.
Keywords:
Freshwater environmentGravity currentsLock-exchange experimentsPlastic pollutionTransport processes

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  • Microfiber transport and deposition were analyzed under different flow conditions.

    • Main Results:

    • Bed roughness and water depth significantly affect turbidity current velocity and MF accumulation.
    • Despite settling tendencies, MFs traveled farther due to streamline alignment, especially smaller diameters.
    • A novel non-dimensional model was developed to predict MF transport.

    Conclusions:

    • MF transport is complex and influenced by hydrodynamic and environmental factors.
    • The developed model offers insights into microfiber fate in aquatic systems.
    • This research is crucial for understanding plastic pollution dynamics.