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61,005 resultsShowing papers similar to Longitudinal and Vertical Transport of Microplastic Within Sediment in Rivers and Transitional Water Environments
ClearModelling 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.
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.
The transport behaviour of microplastics in longitudinal mixing and hyporheic exchange under varied flow conditions
Researchers studied how microplastics move through river systems, examining both downstream transport and how particles interact with riverbeds through hyporheic exchange. Understanding these transport behaviors helps predict where microplastics accumulate in river sediments.
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.
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.
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.
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.
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.
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.
Fate of Microplastics in Deep Gravel Riverbeds: Evidence for Direct Transfer from River Water to Groundwater
Researchers tracked microplastic particles vertically through gravel riverbeds using depth-profile sampling, finding that MPs move directly from river water into subsurface gravel sediments and onward toward groundwater, documenting a pathway for plastic particles to enter drinking water aquifers.
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.
Evaluating factors influencing microplastic mobility in sediments through visualization and experiments
Researchers used micro-CT imaging to visualize three-dimensional transport pathways of microplastics through gravel and sand sediments relevant to riverbank filtration, finding that smaller sediment pore sizes restrict microplastic mobility and that particle properties such as shape, size, and polymer density influence infiltration depth.
A depth-resolved snapshot of microplastic abundances in riffle heads in a gravelbed river
Researchers took depth-resolved samples from gravel riverbed sediments to map how microplastics distribute vertically through streambeds. They found significant quantities at depth, suggesting that riverbeds act as long-term reservoirs of microplastic pollution rather than just transient transport pathways.
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.
Evaluating factors influencing microplastic mobility in sediments through visualization and experiments
Researchers used micro-CT imaging to visualize three-dimensional transport pathways of microplastics through gravel and sand sediments relevant to riverbank filtration, finding that smaller sediment pore sizes restrict microplastic mobility and that particle properties such as shape, size, and polymer density influence infiltration depth.
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.
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.
Transport processes of microplastic particles in the fluvial environment : erosion, transport and deposition
This thesis examines how microplastics are eroded, transported, and deposited in river systems, tracing their movement from land sources to the ocean. The research fills an important gap in understanding how rivers act as conduits for microplastic pollution and what processes determine where plastic particles accumulate in freshwater environments.
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.
A novel Eulerian-Lagrangian numerical framework to investigate microplastic transport at surface water-sediment interfaces.
Scientists created a computer model to study how tiny plastic particles (microplastics) move through riverbeds and get trapped in underwater sediments. The research found that these plastic particles mostly get stuck in shallow layers of riverbeds, especially on the upstream side of underwater hills and ridges. This matters because riverbeds act like filters that collect microplastics from our water systems, which helps us understand where these pollutants end up and how they might affect drinking water and aquatic life.
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.
Microplastic infiltration into mobile sediments
Researchers used an annular flume to simulate how microplastic particles infiltrate into sandy river sediments as bedforms migrate. They found that particle size was the most important factor determining how deep microplastics penetrated into the sediment, while bedform speed and particle density had less influence. The study reveals that smaller microplastics can be buried deeper in river sediments, making them harder to detect and potentially creating long-term contamination reservoirs.
Transport and retention of micro-polystyrene in coarse riverbed sediments: effects of flow velocity, particle and sediment sizes
Researchers conducted column experiments to investigate how polystyrene microplastic fragments are transported and retained in coarse riverbed sediments under different flow conditions. They found that most particles were captured in the upper 15-20 centimeters of sediment, but smaller fragments between 100-500 micrometers could penetrate to depths of at least 50 centimeters. The study suggests that riverbeds can act as both temporary sinks and long-term retention sites for microplastics, slowing their transport from streams to oceans.