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Papers
61,005 resultsShowing papers similar to Modelling the transport and deposition of sediment-microplastics fluxes in a braided river, using Delft3D
ClearStudy of the influence of fluvial dynamics on the distribution and transport of microplastics.
Researchers studied how fluvial dynamics, including water flow, turbulence, and river morphology, influence microplastic distribution and transport in a river system. The study found that hydrological conditions strongly control where microplastics deposit and how they move through the watershed.
Modeling impacts of river hydrodynamics on fate and transport of microplastics in riverine environments
Researchers built a computer model to simulate how microplastics travel and transform in river systems, accounting for particle aggregation and breakage driven by water flow. They found that microplastics clump together significantly in the early stages after entering a river, which changes the size distribution of particles flowing downstream. The study suggests that river conditions play a major role in determining what size and form of microplastics eventually reach the ocean.
A numerical model of microplastic transport for fluvial systems
Researchers developed a reduced-complexity numerical model of microplastic erosion, transport, and deposition in fluvial systems, applying it to the river Têt in France and finding that a large proportion of microplastics become entrained in river sediments before reaching the ocean.
A numerical model of microplastic erosion, transport, and deposition for fluvial systems
Researchers developed a numerical model of microplastic erosion, transport, and deposition in river systems, finding that rivers act as temporary sinks trapping significant fractions of MPs before they reach the ocean, with implications for estimating marine MP loading from terrestrial sources.
From Grains to Plastics: Modeling Nourishment Patterns and Hydraulic Sorting of Fluvially Transported Materials in Deltas
Researchers developed a novel modelling framework to simulate how fluvially transported materials including sediment and plastic contaminants are partitioned and hydraulically sorted across river delta environments. The model addressed the challenge that non-water materials are not uniformly distributed in the water column and may follow characteristic transport pathways distinct from mean flow, improving predictions of microplastic fate in deltaic systems.
Bedload transport rates of microplastics on natural sediments under open channel flow: The role of exposure in acceleration
Researchers developed a new model for predicting how microplastics are transported as bedload in rivers, combining computational fluid dynamics with laboratory experiments. They found that exposed microplastics on the sediment surface move at higher transport rates than natural sediment particles of similar size, potentially spreading contamination over wider areas. The model provides a practical tool for engineers assessing how microplastic pollution disperses through waterway systems.
Modeling microplastic deposition in sandy streams with moving bedforms
Researchers developed a coupled model combining improved mechanistic colloid attachment predictions with a bedform transport model to quantify microplastic deposition in sandy streams with moving dune bedforms, running numerical simulations to assess how streambed characteristics, flow conditions, and particle properties interact to control microplastic retention. The model addressed the poor predictive power of classical colloid filtration theory for microplastics by incorporating bedform dynamics into deposition calculations.
Size-dependent microplastics transport in a sediment rich environment
Researchers developed a two-dimensional depth-averaged numerical model to simulate size-dependent microplastic transport in sediment-rich estuarine environments, incorporating cohesive and non-cohesive sediment classes to capture how tidal deposition and resuspension cycles govern microplastic fate.
The role of pumping and turnover in controlling microplastics entrapment and release in sand-bed rivers
Researchers developed a mathematical framework to model how microplastics are trapped and released in sand-bed rivers through the combined effects of water flow and dune migration. The study found that dune movement substantially alters how microplastics are transported and buried in river sediments, with a nonlinear interplay between shallow rapid exchange and deep burial that depends on dune size and flow conditions.
Plastic drift : Mapping the course of microplastic transport in turbulent riverine flows.
Researchers conducted laboratory experiments tracking the 3D trajectories of 24 negatively buoyant microplastic particles spanning a range of sizes, shapes, and densities in turbulent open channel flow, generating 720 trajectories to evaluate how well conventional sediment transport models apply to microplastics. Results revealed that the inherent variability in microplastic physical properties challenges direct application of sediment transport concepts to microplastic fate prediction in rivers.
Modelling the Fate of Microplastics in river bed sediments.
Researchers modeled microplastic transport, deposition, and burial in river bed sediments under varying hydrological conditions. River bed sediments were found to act as long-term reservoirs for microplastics, with periodic high-flow events temporarily resuspending and redistributing particles.
Study of the influence of fluvial dynamics on the distribution and transport of microplastics.
Researchers studied how fluvial dynamics including flow velocity, turbulence, and river geomorphology influence the distribution and transport of microplastics in river systems. River hydrodynamics were found to be major determinants of where microplastics accumulate and how far they travel, with implications for predicting contamination patterns in river catchments.
A numerical model of microplastic erosion, transport, and deposition for fluvial systems
Researchers developed a reduced-complexity numerical model of microplastic erosion, transport, and deposition in fluvial systems, building on sediment transport methods and applying it to the Têt River in France where outlet flux monitoring data were available. The model found that matching observed fluxes required 1-10 ppm volume concentration of microplastic in the top 0.5 meters of soil, and predicted that a large proportion of microplastics become trapped in river sediments rather than reaching the ocean.
Storm Response of Fluvial Sedimentary Microplastics
Researchers investigated how storm events affect microplastic concentrations in river sediments, finding that flood conditions remobilize stored particles and significantly increase microplastic loads in fluvial systems. The study identified key physical controls on microplastic storage and transport in river channels.
Identification of Microplastic Accumulation Zones in a Tidal River: A Case Study of the Fraser River, British Columbia, Canada
Researchers used a 3D hydrodynamic model coupled with a Lagrangian particle tracking model to simulate microplastic transport and identify accumulation zones in the tidal Fraser River in British Columbia. The modelling identified specific depositional hotspots linked to flow velocity gradients, providing a framework for targeted monitoring and remediation.
Dispersal and transport of microplastic particles under different flow conditions in riverine ecosystem
Researchers developed a particle-tracking model combined with hydrodynamic simulation to study how microplastics travel through river systems under different water flow conditions. They found that flow speed, turbulence, and river channel features significantly influence where microplastics accumulate and how far they travel. The study provides a useful tool for predicting microplastic transport patterns and identifying pollution hotspots in river ecosystems.
Exploring the Sensitivity of Microplastic Accumulation Zones in Rivers Using High-Performance Particle Transport Modelling
Researchers applied high-performance particle transport modelling to explore the sensitivity of microplastic accumulation zones in rivers, identifying key hydrodynamic factors that govern where microplastics concentrate. The modelling approach provides a tool for predicting hotspot areas of microplastic deposition in fluvial environments.
Investigating Microplastic Resuspension in Environmental flows: Experimental and Numerical Approaches
Researchers used combined experimental and numerical approaches to investigate the resuspension of microplastics from sediment beds in riverine flows, finding that turbulence intensity during high-flow events plays a key role in detaching MP particles embedded in multi-density granular sediment beds.
A Lagrangian Model for Microplastics Transport in Rivers
Researchers developed a Lagrangian computational model to simulate how microplastics are transported through river systems, accounting for particle buoyancy, turbulence, and settling behavior. The model provides a tool for predicting microplastic fate and accumulation in freshwater environments.
On the vertical structure of non-buoyant plastics in turbulent transport
Researchers investigated how non-floating plastic debris moves through river-like flows and found that plastics settle in unique, complex patterns due to their irregular shapes. In low-turbulence conditions, interactions between the plastic particles and the riverbed enhanced mixing beyond what standard sediment transport models would predict. The study proposes a new equation for describing how plastics are distributed vertically in flowing water.
Understanding how sediment movement affects microplastic deposition in sandy streambeds: A modeling study.
Researchers used a numerical model of flow and particle transport in moving streambed sediment to quantify how streambed motion affects microplastic deposition and accumulation, running simulations across streamwater velocities of 0.1-0.5 m/s and varying median grain sizes to examine MPs of all sizes and densities.
Longitudinal and Vertical Transport of Microplastic Within Sediment in Rivers and Transitional Water Environments
Researchers investigated the longitudinal and vertical transport of microplastics within sediments in rivers and transitional water environments, developing models to quantify how sediment presence affects microplastic mobility and their transport toward coastal areas.
Rivers as Conduits: A Comprehensive Model of Microplastic Fate and Transport
This study developed a comprehensive model of microplastic fate and transport in rivers, integrating processes of erosion, resuspension, sedimentation, and burial to simulate how microplastics move through river networks toward the ocean.
Leveraging Sedimentary Process Insights to Enhance Understanding of Microplastic Deposition in Rivers
This review leverages insights from fluvial sediment transport research to improve understanding of how microplastics deposit and are buried in river networks, identifying knowledge gaps in water-sediment exchange processes and highlighting that current MP deposition estimates are biased by incomplete understanding of flow-sediment-particle interactions.