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On the vertical structure of non-buoyant plastics in turbulent transport.
Lofty, James; Valero, Daniel; Moreno-Rodenas, Antonio; Belay, Biruk S; Wilson, Catherine; Ouro, Pablo; Franca, Mário J.
Afiliación
  • Lofty J; Cardiff University, School of Engineering, Hydro-Environmental Research Centre, Wales, UK. Electronic address: Loftyj@cardiff.ac.uk.
  • Valero D; Karlsruhe Institute of Technology, Institute of Water and Environment, Karlsruhe, Germany; Water Resources and Ecosystems Department, IHE Delft, Delft, the Netherlands; Presently: Imperial College London, Civil and Environmental Department, London, UK. Electronic address: d.valero@imperial.ac.uk.
  • Moreno-Rodenas A; Deltares, Hydraulic Engineering Department, Delft, the Netherlands.
  • Belay BS; Hydraulic Engineering Chair, Helmut Schmidt University, Hamburg, Germany.
  • Wilson C; Cardiff University, School of Engineering, Hydro-Environmental Research Centre, Wales, UK.
  • Ouro P; School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK.
  • Franca MJ; Karlsruhe Institute of Technology, Institute of Water and Environment, Karlsruhe, Germany.
Water Res ; 254: 121306, 2024 May 01.
Article en En | MEDLINE | ID: mdl-38432001
ABSTRACT
Plastic pollution is overflowing in rivers. A limited understanding of the physics of plastic transport in rivers hinders monitoring, the prediction of plastic fate and restricts the implementation of effective mitigation strategies. This study investigates two unexplored aspects of plastic transport dynamics across the near-surface, suspended and bed load layers (i) the complex settling behaviour of plastics and (ii) their influence on plastic transport in river-like flows. Through hundreds of settling tests and thousands of 3D reconstructed plastic transport experiments, our findings show that plastics exhibit unique settling patterns and orientations, due to their geometric anisotropy, revealing a multimodal distribution of settling velocities. In the transport experiments, particle-bed interactions enhanced mixing beyond what established turbulent transport theories (Rouse profile) could predict in low-turbulence conditions, which extends the bed load layer beyond the classic definition of the bed load layer thickness for natural sediments. We propose a new vertical structure of turbulent transport equation that considers the stochastic nature of heterogeneous negatively buoyant plastics and their singularities.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Ríos Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Ríos Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido