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61,005 resultsShowing papers similar to Effects of microplastics on the rheological properties of sediment slurries in aquatic environments
ClearImpacts of microplastic concentrations and sizes on the rheology properties of lake sediments
Researchers studied how microplastic concentration and size affect the rheological properties of lake sediments, finding that 0.5-2 percent microplastic content decreased sediment viscosity and yield stress by up to 38 percent compared to controls. Smaller particles had greater effects on sediment flow behavior than larger ones.
Impacts of microplastic contamination on the rheology properties of sediments in a eutrophic shallow lake
Researchers assessed the impact of microplastic contamination on the rheological properties of sediments in a eutrophic shallow lake, examining how plastic particles alter erosion resistance and sediment mechanics. Results indicated that microplastic accumulation measurably changes the physical behavior of lake sediments.
Flocculation and its impact on microplastic transport mechanisms in rivers
Researchers used rotating wheel laboratory experiments to investigate microplastic-sediment flocculation mechanisms in rivers, finding that fine cohesive sediments adhere to MP particles to form aggregates that modify transport behaviour and enhance deposition, contributing to MP accumulation in riverine sedimentary deposits.
Behaviour and transport of microplastics under saturated flow conditions in sediments and soils
Researchers investigated the behaviour and transport of microplastics under saturated flow conditions in sediments and soils, examining how particle properties influence movement through porous media. The study aimed to improve understanding of subsurface microplastic fate and transport relevant to both soil and groundwater contamination.
Suspended sediments mediate microplastic sedimentation in unidirectional flows
Researchers found that suspended sediments in water significantly increase microplastic sedimentation rates, with higher sediment concentrations driving greater downward transport of microplastics and creating differential settling patterns based on polymer type.
Settling of microplastics in mucus-rich water column: The role of biologically modified rheology of seawater
Laboratory experiments showed that naturally occurring exopolymers secreted by marine algae and bacteria convert seawater into a non-Newtonian fluid that slows the sinking of microplastic particles, altering how and where they accumulate in the ocean water column. Understanding these biologically driven settling dynamics is important for predicting microplastic distribution and exposure risk for marine organisms at different depths.
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.
AQuantitative Relationshipbetween Settling and Wettabilityfor Weathered Microplastics in Aquatic Systems
Researchers quantified the relationship between surface wettability and settling velocity for weathered microplastics in aquatic systems, demonstrating that wettability-driven microscale changes at the particle-water interface modify drag forces and thus govern the transport and fate of submillimeter plastic particles.
Flocculation of PVC Microplastic and Fine-Grained Cohesive Sediment at Environmentally Realistic Concentrations
Laboratory flocculation experiments showed that PVC microplastics form aggregates with fine cohesive sediment at environmentally realistic concentrations, with aggregate size and settling velocity influenced by salinity and mixing energy, affecting microplastic transport in estuarine environments.
Analysis of hydraulic conditions considering the influence of particle shape
This review article examined how particle shape influences fluid dynamics and sediment transport across various engineering and environmental contexts. Understanding particle shape effects is relevant to predicting how microplastics of different shapes move and settle in aquatic environments.
Effects of microplastics on sedimentary geochemical properties and microbial ecosystems combined with hydraulic disturbance
Researchers investigated how microplastics interact with river sediments under flowing water conditions versus still water. They found that water movement significantly amplified the effects of microplastics on sediment structure, organic matter, and enzyme activity compared to static conditions. The study reveals that the environmental impact of microplastics in rivers is more complex and potentially greater than laboratory experiments under calm conditions would suggest.
Experimental study on parameterizing microplastic-sediment aggregation
Researchers conducted laboratory flocculation experiments to parameterize microplastic-sediment aggregation, testing fibers, fragments, and spheres of varying sizes and densities to characterize how microplastics and sediment form flocs with enhanced settling velocity, with the goal of improving numerical transport models of microplastic fate in rivers and estuaries.
Sedimentation of microplastics interacting with sediment
Researchers conducted laboratory settling velocity experiments for 12 different microplastic types with varying shapes in both clear and turbid water, finding that the simultaneous presence of suspended sediments significantly alters MP settling behaviour in ways not captured by existing models that assume clean water conditions.
Behaviour and transport of microplastics under saturated flow conditions in sediments and soils
Researchers investigated the behavior and transport of microplastics under saturated flow conditions in sediments and soils, examining how physical and chemical properties of microplastic particles influence their mobility through porous geological media. The study addressed knowledge gaps in understanding subsurface microplastic transport relevant to groundwater contamination and the fate of microplastics deposited in terrestrial environments.
Transport and accumulation of plastic particles on the varying sediment bed cover: Open-channel flow experiment
Researchers conducted open-channel flow experiments to study how various plastic particles of differing shape, size, density, and flexibility are transported and retained across sediment beds of varying grain size, finding that friction-driven retention zones consistently form at boundaries between finer and coarser sediments, offering a mechanism to explain the patchy distribution of microplastics in seafloor sediments.
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.
AQuantitative Relationshipbetween Settling and Wettabilityfor Weathered Microplastics in Aquatic Systems
Researchers quantified the relationship between surface wettability and settling velocity for weathered microplastics in aquatic systems, demonstrating that wettability-driven changes at the particle-water interface alter drag forces and thus residence time and distribution in the water column.
Microplastic and natural sediment in bed load saltation: Material does not dictate the fate
Researchers investigated how microplastics move as bed load in river flows and found that transport behavior in saltation was governed primarily by particle size, shape, and density rather than material composition, suggesting that microplastics follow similar transport mechanics as natural sediment.
Transport and sedimentation of microplastics by turbidity currents: Dependence on suspended sediment concentration and grain size
Researchers used laboratory experiments to study how turbidity currents, underwater flows of sediment-laden water, transport and deposit microplastics on the ocean floor. They found that higher sediment concentrations carried microplastics farther, and finer sediment grains enhanced transport distances compared to coarser ones. The findings suggest that both the properties of the sediment flow and the shape and density of microplastic particles play important roles in determining where plastics end up in marine sediments.
The effects of stream water velocity, streambed celerity, and particle properties on microplastic deposition in streams
Researchers conducted laboratory flume experiments to examine how stream water velocity, bedform movement, and microplastic particle properties (material type PET/PP/PA and fiber length 25-200 µm) influence the deposition dynamics of microplastics in sandy streambeds, finding that bedform movement and particle characteristics significantly affected deposition rates and sediment distribution patterns.
Sedimentation behavior of aggregated microplastics: Influence of particle size and water constituents in environmental waters
Laboratory experiments investigated how aggregation of microplastics with sediments and organic matter affects their sinking rates in water, finding that aggregate composition strongly influences settling velocity. These findings improve models predicting whether microplastics sink to the seafloor or remain suspended in the water column.
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.
Microplastic deposition in streams under moving bedforms
Researchers conducted flume experiments to examine microplastic deposition in sandy streambeds under moving bedform conditions, finding that bedform migration and particle size both control whether microplastics are buried or remain in suspension, with implications for estimating MP residence times in river systems.
Water retention and hydraulic properties of a natural soil subjected to microplastic contaminations and leachate exposures
Researchers studied how microplastic contamination affects the water-holding and flow properties of compacted soil, a scenario relevant to engineering applications like landfill liners. They found that microplastics altered the soil's ability to retain water and changed both saturated and unsaturated hydraulic conductivity, with effects varying by particle size and leachate age. The study suggests that microplastic-contaminated soils may behave differently than expected in engineered structures.