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61,005 resultsShowing papers similar to Experimental study on whole process of river blockage and dam break under different hydrodynamic conditions
ClearExperimental Study on the Influence of Different Dam Body on the Sediment Interception and Discharge Capacity of the Cascade Permeable Dams
This hydraulic engineering study evaluates how the composition of cascade permeable dam bodies affects sediment interception and discharge capacity. The study is focused on river sediment management engineering and is unrelated to microplastic research.
Influence of Spacing on the Retention Process of Cascade Permeable Dams for Upstream Sediment-Laden Flow
Researchers conducted flume experiments to investigate how dam spacing affects sediment retention performance in cascade permeable dams, finding that larger dam spacing increased water level differences and that permeability coefficient declined by 30-40% during initial operation, informing optimal dam design for river sediment management.
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.
Experimental study of interception effect by submerged dam on microplastics
Researchers used a laboratory flow flume to study how a submerged dam intercepts PVC and polystyrene microplastics, finding that the dam captured most particles but that un-intercepted particles changed their transport behavior downstream. The study quantified interception rates and identified factors influencing dam performance as a passive microplastic barrier in river management.
A Shear Reynolds Number-Based Classification Method of the Nonuniform Bed Load Transport
Researchers developed a method based on shear Reynolds numbers to classify bed load transport in rivers with mixed sediment. Understanding how particles of different sizes move in rivers is relevant to modeling how microplastics, which vary in size and density, are transported and deposited in river systems.
Influence of sediment size on microplastic fragmentation
Researchers examined how sediment grain size influences the physical fragmentation of microplastics in river environments, where the mechanical controls on microplastic storage, remobilization, and transfer pathways remain poorly understood. The study found that sediment size plays a meaningful role in breaking down plastic particles, contributing to the generation of smaller microplastic fragments in fluvial systems.
Capture of plastic litter by sluice gate and trash racks
Researchers conducted hydraulic flume experiments to assess how well sluice gates and trash racks capture plastic litter of varying shapes and sizes, finding that each structure has a threshold particle size above which capture efficiency becomes reliable. The results suggest these water management devices can be optimised for plastic removal, offering a practical intervention point for reducing plastic transport through river systems.
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.
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.
Trapped microplastics within vertical redeposited sediment: Experimental study simulating lake and channeled river systems during resuspension events
Researchers simulated sediment resuspension events to study how microplastics of different densities, sizes, and shapes become trapped within redeposited sediment layers, finding that particle properties strongly influence vertical redistribution patterns in lake and river systems.
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.
Controls on microplastic breakdown due to abrasion in gravel bed rivers
Researchers investigated the physical controls on microplastic fragmentation due to mechanical abrasion in gravel-bed rivers, examining how particle size, morphology, polymer type, and weathering state influence breakdown rates and the resulting changes in surface properties that alter risk profiles during fluvial transport.
Urban River Water Level Increase Through Plastic Waste Accumulation at a Rack Structure
This study examined how plastic waste accumulation at river trash racks increases upstream water levels and raises urban flood risk, using field measurements and hydraulic modeling. Results show that even partial blockage by plastic debris can significantly reduce drainage capacity and worsen flooding in urban areas.
Evaluation of Behavior of Floating Litter During Flooding with Levee Breach by Using Inundation Analysis
Researchers improved a comprehensive flood analysis model to simulate floating litter movement during levee breach flooding events, incorporating drainage from sluiceways and pumps. Simulations found that over half of the floating litter generated in urban areas remains within the residential zone during flooding, while about one-fifth exits through breach sites into rivers and around 13% accumulates at drainage gates.
Median bed-material sediment particle size across rivers in the contiguous U.S.
This study produced the first continuous regional map of river bed sediment particle sizes across the contiguous United States. Understanding sediment dynamics in rivers is relevant to predicting how microplastics—which behave similarly to sediment particles—are transported and deposited in waterways.
Influence of plastic-clastic bed composition on the threshold conditions for the plastic fraction
Researchers conducted flume experiments to investigate how mixed plastic-clastic bed composition affects the threshold conditions required to mobilize negatively buoyant plastic grains, distinguishing the influence of bed layer characteristics from those of individual grain properties. Their findings provide insight into the sedimentary behavior of dense plastic particles in river systems, improving understanding of plastic transport dynamics along fluvial pathways.
Suspended sediment dynamics and the related environmental risk assessment in a sensitive water area
Researchers used 2D hydrodynamic modeling to show that suspended sediment loads in China's Nanji Mountain Nature Reserve vary strongly with seasonal river input from the Ganjiang, and that wet-season sediment pulses carry microplastic and nutrient fluxes up to ten times higher than dry season — elevating ecological risk precisely when waterbird populations are lower.
The effects of large roughness elements on the in-stream transport and retention of polystyrene microplastics
Laboratory flume experiments showed that large roughness elements like boulders in riverbeds significantly alter how polystyrene microplastics are transported and retained, with two distinct flow regimes determining whether particles travel quickly or get trapped. Understanding these river dynamics is essential for predicting where microplastics accumulate in freshwater systems and designing realistic environmental risk models.
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.
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.
Microplastic trapping in sandy bedload: insights from flume experiments
Researchers conducted flume experiments to investigate the mechanisms controlling microplastic trapping in sandy bedload sediments, examining how particles of different sizes and densities become buried within ripple structures formed by unidirectional tractional flows. The study provided insights into riverine microplastic sedimentation dynamics relevant to understanding transient storage during land-to-ocean transport.
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.
Experimental study on the motion characteristics and critical hydraulic parameters of microplastics in a freshwater environment
Researchers conducted hydraulic flume experiments and force analyses to determine critical flow velocity thresholds for microplastic initiation, transport, and resuspension in freshwater environments, finding that settling velocities ranged from 0.05 to 0.17 m/s and that higher density, rougher surfaces, and flake-like shapes all increased the critical flow velocity required for microplastic movement.
Modelling the transport and deposition of sediment-microplastics fluxes in a braided river, using Delft3D
Researchers developed a hydromorphodynamic numerical model using Delft3D to simulate the co-transport and deposition of microplastics alongside natural sediment in a braided river, revealing distribution patterns, morphological changes, and the load balance of plastic debris under varying flow conditions.