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61,005 resultsShowing papers similar to The transport behaviour of microplastics in longitudinal mixing and hyporheic exchange under varied flow conditions
ClearSignificance of Hyporheic Exchange for Predicting Microplastic Fate in Rivers
Researchers modeled the role of hyporheic exchange — water flow between rivers and streambed sediments — in driving microplastic delivery and retention in riverbeds, finding that this process significantly increases the rate at which small and positively buoyant microplastics are transported into streambed sediments. The study highlights hyporheic exchange as an underappreciated mechanism controlling microplastic fate in freshwater environments.
Bedform segregation and locking increase storage of natural and synthetic particles in rivers
Researchers discovered that the exchange of water between rivers and their riverbeds (called hyporheic exchange) plays a major role in trapping fine particles — including synthetic particles — within riverbed sediments, sometimes locking them in place permanently. This finding helps explain how microplastics and other fine pollutants become stored in river sediments rather than being flushed downstream.
Microplastic accumulation in riverbed sediment via hyporheic exchange from headwaters to mainstems
Researchers developed a model showing that hyporheic exchange between river surface water and sediment causes long-term microplastic retention, with headwater residence times averaging 5 hours per kilometer but increasing to 7 years per kilometer during low-flow conditions.
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.
Hyporheic exchange processes of pore-scale microplastics
Researchers studied how microplastics move through the hyporheic zone, the region where river water mixes with groundwater beneath the streambed. They found that denser plastic particles sank through sediment pores toward groundwater, while lighter plastics rose to the surface, and both behaved differently from dissolved substances. These findings raise concerns that microplastics may be contaminating groundwater systems through processes that are not well captured by current water quality models.
Microplastic Pathways: Investigating Vertical and Horizontal Movement from Riverine Environments to Oceans
Researchers investigated the vertical and horizontal movement of microplastics in riverine systems en route to the ocean, examining how physical MP characteristics and hydrodynamic conditions govern whether particles settle near riverbeds or float at the surface, and how both gravity-driven and flow-driven transport contribute to their ultimate fate.
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.
Microplastic transport in rivers and their hyporheic zone – combining modeling and experiment
Researchers combined computational fluid dynamics (CFD) simulations with flume experiments to investigate the transport and fate of small polystyrene microplastic particles (1, 3, and 10 micrometres) in a rippled sandy streambed, including exchange into the hyporheic zone. Using a novel fluorescent MP detection system, they quantified how particle size and hydrodynamic conditions govern microplastic retention and hyporheic exchange in riverbed sediments.
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.
Study 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.
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.
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.
Hydro-geomorphological features govern the distribution, storage, and transport processes of riverbed microplastics
This study examined how river channel shape, water flow, and sediment dynamics control where microplastics accumulate, travel, and are stored in riverbeds. Identifying these hydro-geomorphological drivers is important for predicting microplastic transport to downstream ecosystems and the ocean.
Hydro-geomorphological features govern the distribution, storage, and transport processes of riverbed microplastics
This study examined how river channel shape, water flow, and sediment dynamics control where microplastics accumulate, travel, and are stored in riverbeds. Identifying these hydro-geomorphological drivers is important for predicting microplastic transport to downstream ecosystems and the ocean.
The role of biofilm and hydrodynamics on the fate of microplastic particles in rivers: an experimental study
Researchers conducted experimental flume studies to investigate how biofilm formation and hydrodynamic conditions jointly govern microplastic particle fate in rivers, examining why some urbanized and industrialized river reaches show no significant upstream-to-downstream increase in microplastic concentration despite theoretical inputs.
Longitudinal Dispersion and Hyporheic Exchange of Neutrally Buoyant Microplastics in the Presence of Waves and Currents
Laboratory experiments tracked neutrally buoyant microplastics (mimicking polyethylene density) under different water conditions including combined wave-current flows, finding that their movement through the water column closely resembles dissolved tracers — but that microplastics already lodged in a riverbed sediment exchange more slowly than solutes due to density-driven effects over longer timescales. Understanding these transport dynamics is essential for accurate models predicting where microplastics accumulate in river and coastal sediments.
Assessing the Behavior of Microplastics in Fluvial Systems: Infiltration and Retention Dynamics in Streambed Sediments
Scientists used laboratory river-bed simulations to study how microplastics move from surface water down into streambed sediments. Smaller particles (1 micrometer) penetrated deeper into the sediment than larger ones, and higher water flow pushed more particles downward. This research helps explain how microplastics accumulate in river beds, which serve as both drinking water sources and habitats for aquatic organisms.
Making waves: Unraveling microplastic deposition in rivers through the lens of sedimentary processes
Researchers examined how sedimentary processes in rivers control where microplastics are deposited and how long they remain buried. They reviewed existing work on water-sediment exchange of microplastic particles and identified key gaps in understanding deposition dynamics. The study highlights that rivers serve as major pathways for transporting microplastics from land to oceans, and that sediment processes play a critical role in determining their fate.
Modelling the Fate of Microplastics in river bed sediments.
Researchers modeled the fate of microplastics deposited in river bed sediments, examining how hydrological conditions influence their distribution, burial, and potential for downstream transport. The models revealed that river bed sediments act as significant long-term reservoirs for microplastic pollution.
Turbulence‐Driven Clogging of Hyporheic Zones by Fine Particle Filtration
This study is not directly about microplastics; it investigates how river turbulence drives fine particle exchange between surface water and the streambed (hyporheic zones), finding that turbulence significantly accelerates particle delivery and can clog the riverbed over time. This process is relevant to understanding how microplastics might be buried and retained in river sediments.
Resolving the dynamics of microplastic transport and burial in rivers requires the incorporation of fluvial sedimentary processes
This review examines how fluvial sedimentary processes govern microplastic transport and burial in river networks, summarizing research on shear stress controls of MP deposition onto surficial sediment, water-sediment exchange dynamics, and the time scales over which MPs are buried and remobilized.
Exploring the influence of sediment motion on microplastic deposition in streambeds
This study systematically explored how sediment motion affects microplastic deposition in streambeds made of fine sediments, finding that sediment transport dynamics play a critical role in controlling where microplastics accumulate. The results improve understanding of microplastic fate in riverine systems.
Comprehensive review of the co-transport of microplastics and suspended sediments in aquatic environments: macroscopic transport and microscopic mechanisms
Researchers reviewed how microplastics and suspended sediments interact and travel together through rivers, lakes, and coastal waters, identifying water flow conditions, particle density, and plastic shape as key factors governing their joint migration and deposition. Understanding these co-transport dynamics is essential for predicting where microplastics accumulate and assessing their ecological risks.
Infiltration and retention of micro/nanoplastics in the hyporheic zone of rivers
This study combined flume experiments and numerical simulations to investigate how microplastics infiltrate the hyporheic zone (the sediment beneath rivers). Most microplastics accumulated in surface sediment layers, with hydrodynamic conditions and particle properties—especially size and density—critically controlling how deep particles penetrate.