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61,005 resultsShowing papers similar to Influence of Spacing on the Retention Process of Cascade Permeable Dams for Upstream Sediment-Laden Flow
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.
Experimental study on whole process of river blockage and dam break under different hydrodynamic conditions
Researchers conducted eight flume model experiments under varying inflow rates to study the full process of river blockage and dam break, identifying four distinct stages and finding that peak discharge generally increases with inflow rate while the slope of the inflow-to-peak-discharge curve decreases as median sediment particle size increases.
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.
Effect of cascade damming on microplastics transport in rivers: A large-scale investigation in Wujiang River, Southwest China
Researchers investigated how cascade damming on the Wujiang River in China affects microplastic transport, finding that dams intercept microplastics and reduce their downstream flux, with midstream areas showing the highest concentrations.
Submergence ratio and spacing between in-stream obstructions determine capture and accumulation of drifting particles in rivers
Flume experiments examined how the spacing and height ratio of in-stream obstructions (like logs or boulders) affect microplastic capture and retention in rivers. The results could inform nature-based stream management strategies designed to trap microplastics before they reach the ocean.
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.
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.
Advances in Ecological and Environmental Effects of Mountain River Sediment
This review systematically examined the ecological and environmental effects of sediment in mountain rivers, covering adsorption and transport processes as well as impacts on aquatic microorganisms, animals, plants, and food webs. The authors note that large-scale cascade reservoir construction has further complicated sediment dynamics and its ecological consequences.
The effect of dams on river transport of microplastic pollution
This study investigated whether dams trap microplastics in river sediments, finding significant accumulation of microplastics upstream of dams compared to downstream, suggesting dams act as microplastic sinks. The findings have implications for managing microplastic transport through river systems and for understanding contamination risks associated with dam removal.
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.
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.
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.
Microplastic trapping in sandy bedload: insights from flume experiments
Researchers conducted flume experiments using a 4-metre channel to investigate how microplastic particles become trapped within sandy bedload ripples formed by unidirectional water flows, examining interactions between microplastics and inorganic sediment particles under controlled depositional conditions. The findings provide mechanistic insights into how microplastics are temporarily stored in riverine sediments during their transfer from land to ocean.
The effect of groyne field on trapping macroplastic. Preliminary results from laboratory experiments
Researchers conducted laboratory channel experiments showing that groyne fields paired with vegetation deflect floating macroplastic litter and increase its retention time, suggesting that low-flow zones with vegetation are optimal sites for plastic trapping infrastructure in rivers.
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.
Using secondary currents induced by air curtains to improve trapping of plastic particles
Researchers analyzed whether air curtains in rivers could trap plastic particles by directing them into lateral retention basins, finding that while secondary currents extend plastic residence time, permanent retention was low and likely requires additional structures like vegetation to be effective.
Discharge coefficients for ogee spillways
Researchers fabricated physical models of ogee weirs with varying upstream slope angles (vertical, 18, 33, and 45 degrees), apron thicknesses, and downstream submergence conditions to investigate factors affecting discharge coefficients, finding that the coefficient increases with the ratio of spillway height to head (P/He) before plateauing and decreases under submerged-flow conditions.
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.
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.
Permeable Asphalt Pavements (PAP): Benefits, Clogging Factors and Methods for Evaluation and Maintenance—A Review
This review examines permeable asphalt pavements as a stormwater management solution that allows water to infiltrate rather than run off urban surfaces. Researchers found that while these pavements effectively filter pollutants including microplastics from stormwater, their performance degrades over time due to sediment clogging. The study evaluates methods for assessing and maintaining pavement permeability to sustain their environmental benefits.
Investigations on microplastic infiltration within natural riverbed sediments
Researchers used laboratory flume experiments to investigate how sediment grain size affects the infiltration of four types of microplastics (PET spheres, PET ellipsoids, polystyrene fragments, and polyamide fibers) into riverbed sediments. Sediment particle size, microplastic shape, and density were key factors controlling how deeply microplastics penetrate into the hyporheic zone.
The microbial community and functional indicators response to flow restoration in gradient in a simulated water flume
Researchers examined how microbial community structure and functional indicators respond to gradient flow restoration in a simulated water flume, finding that flow regime significantly influences river ecological systems including functional indicators and microbial community composition.
Factors influencing the vertical distribution and transport of plastics in riverine environments: Theoretical background and implications for improved field study design.
This review examines the physical and hydrodynamic factors governing the vertical distribution and transport of plastics in riverine environments, synthesizing theoretical background on settling velocity, turbulence, and buoyancy to provide recommendations for improved field study design.
Trapping Efficiency of Non-Buoyant Microplastics by River Groynes
Flume experiments tested ten groyne configurations (river bank structures used for erosion control) for their ability to trap dense, non-floating microplastics, finding that all configurations retained at least 6% of particles and upstream-inclined groynes retained up to 20.7%. Rivers are major transport routes for microplastics moving from land to sea, and this study shows that existing river engineering structures can serve a secondary function as passive microplastic traps. Optimizing groyne design could offer a low-cost, passive strategy for intercepting microplastics before they reach the ocean.