Transport dynamics of microplastics within aquatic vegetation featuring realistic plant morphology

Water Research, Год журнала: 2025, Номер 282, С. 123534 - 123534

Опубликована: Апрель 6, 2025

Despite the significance of rivers and streams in transporting terrestrial microplastics (MP) to oceans, limited research has focused on role aquatic vegetation their complex geometry shaping underlying mechanisms governing MP mixing dispersion processes riverine environments. This study, for first time, investigates transport fate non-buoyant MPs, specifically those with diameters 188 nm 6μm a density 1.04 g/cm3, floating Eichhornia crassipes canopies under flow conditions typical natural (0.0167-0.0667 m/s). Physical modelling tests reveal that significantly alters hydrodynamic structure enhances dissipation turbulence water column, leading decreased velocities, diversified length scales, increased turbulent kinetic energy (TKE) regions higher frontal areas. turbulence, turn, facilitated momentum exchange vertical mixing, particularly most pronounced area changes. Wider canopy spacing promoted evolution wake expansion throughout generating coherent structures effectively doubled integral scales increasing distance between from 0.5 m 1.5 m. adjustment resulted more uniformly dispersed downstream movement MPs. Notably, presence amplified diffusivity by 10-40 times compared equivalent unvegetated conditions, transitioning primary mechanism shear-induced velocity gradients enhanced plant-flow interactions. study offers robust framework quantifying predicting longitudinal coefficients within vegetated flows, developing models depict profiles TKE featured morphology spacing. The insights this make significant contribution towards improving our ability predict MPs environments underscore necessity incorporating dynamics into environmental management risk assessments.

Язык: Английский

PFASs contamination in the LongTing Lake sediments: Vertical-temporal variation, sources, microbial impacts, and risk assessment

Journal of Water Process Engineering, Год журнала: 2025, Номер 74, С. 107782 - 107782

Опубликована: Апрель 25, 2025

Язык: Английский