We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Modelling the Fate of Microplastics in river bed sediments.
Summary
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 proliferation of microplastics (MPs) in rivers poses a significant global challenge and a threat to the environment, livelihoods, and human health. However, there is a lack of knowledge regarding the dispersal patterns and transport of MPs in river sediments. This study examines the distribution patterns of microplastic fibers and fragments, focusing on their dependence on column properties such as seepage velocity, sediment grain size, and the size of the microplastic fibers and fragments. Batch experiments were conducted using steel columns measuring 50 cm in length and 5 cm in diameter, with a flow rate of 15 ml/minute. After the experiments, sediment samples from the columns were collected at different depths and density separation was conducted to extract microplastics from the samples. Subsequently, the vertical profile of MP concentration was found using fluorescence microscopy. The most prominent MP type was Polyethylene (PE). Most of the MP particles were retained up to the depth of 30 cm, some MP fibers were also found in the outlet water which suggests that in actual field conditions, they will be deposited at a depth greater than 50 cm of the river bed. The concentration of MPs was dependent on the size of MPs particles, the grain size of sediments, and the inlet flow rate as indicated by the regression model with (R2 ¿0.90). The empirically derived equations from the regression models suggest that MP particles are prone to deposition at depths greater than 50 cm in the riverbed. Our study concludes that developed regression model is capable of predicting the deposition of MP particles in riverbeds in low flow rate conditions in the rivers. Also see: https://micro2024.sciencesconf.org/559676/document
Sign in to start a discussion.
More Papers Like This
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.
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.
Modeling microplastic dynamics in riverine systems: fate and transport analysis
Researchers developed a computer model to simulate how microplastics travel through river systems, accounting for how they enter from human activities and how they settle, resuspend, and deposit along riverbanks. The model was applied to the Tame River in the UK using four different scenarios based on plastic particle types like fibers, fragments, and pellets. The study provides a tool for predicting where microplastics accumulate in rivers, which could help target cleanup and monitoring efforts.
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.
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.