Learning from natural sediments to tackle microplastics challenges: A multidisciplinary perspective

Earth-Science Reviews, Год журнала: 2022, Номер 228, С. 104021 - 104021

Опубликована: Апрель 5, 2022

Although the study of microplastics in aquatic environment incorporates a diversity research fields, it is still its infancy many aspects while comparable topics have been studied other disciplines for decades. In particular, extensive sedimentology can provide valuable insights to guide future research. To advance our understanding comparability natural sediments with microplastics, we take an interdisciplinary look at existing literature describing particle properties, transport processes, sampling techniques and ecotoxicology. Based on analysis, define seven goals that are essential improve be tackled by learning from sediment research, identify relevant tasks achieve each goal. These address (1) description microplastic particles, (2) interaction environmental substances, (3) vertical distribution (4) erosion deposition behaviour (5) impact biota transport, (6) methods (7) toxicity. When should specifically draw knowledge sediments, example using shape factors or applying determining principal dimensions non-spherical particles. Sediment offers fundamentals transferable could usefully applied. However, major gaps exist role modes, influence importance implementation dynamic as result time-dependent changes properties numerical models. We give overview available discuss their suitability sampling, which used creating standardised guidelines application microplastics. order comprehensively assess ecotoxicology distinction must made between effects polymers themselves, physical form, plastic-associated chemicals attached pollutants. This review highlights areas where rely - need new, microplastic-specific synthesize recommendations future,

Язык: Английский

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Plant Morphology Impacts Bedload Sediment Transport

Geophysical Research Letters, Год журнала: 2024, Номер 51(12)

Опубликована: Июнь 14, 2024

Abstract Bedload sediment transport plays an important role in the evolution of rivers, marshes and deltas. In these aquatic environments, vegetation is widespread, plant species have unique morphology. However, impact real morphology on flow has not been quantified. This study used model plants with morphology, based Phragmites australis , Acorus calamus Typha latifolia . The frontal area increases away from bed, which leads to higher near‐bed velocity than would be predicted depth‐average area. A coefficient was defined quantify vertically‐varied Laboratory experiments confirmed that improved prediction velocity, turbulent kinetic energy bedload rate canopies realistic Plant can alter rates by up order magnitude, relative assumption uniform

Язык: Английский

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Prediction of bedload transport inside vegetation canopies with natural morphology

Journal of Hydrodynamics, Год журнала: 2024, Номер 36(3), С. 556 - 569

Опубликована: Июнь 1, 2024

Язык: Английский

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Predicting velocity and turbulent kinetic energy inside an emergent Phragmites australis canopy with real morphology

Environmental Fluid Mechanics, Год журнала: 2023, Номер 23(4), С. 943 - 963

Опубликована: Авг. 1, 2023

Язык: Английский

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Insights for River Restoration: The Impacts of Vegetation Canopy Length and Canopy Discontinuity on Riverbed Evolution

Water Resources Research, Год журнала: 2024, Номер 60(7)

Опубликована: Июль 1, 2024

Abstract River restoration projects often involve vegetation planting to retain sediment and stabilize riverbanks. Laboratory experiments have explored the impact of rigid emergent canopies on bed morphology. Inside canopies, erosion is attributed vegetation‐induced turbulent kinetic energy ( TKE ). Based in‐canopy local criteria for movement, a method established validated predicting length region. In bare channel, related ratio canopy flow adjustment distance, L / I , exhibits two trends. At < 1, maximum depth, d s ) length, region increase with increasing length. ≥ are not influenced by remain constant. vegetated regions same plant density, discontinuous (streamwise interval width D yield weaker than continuous canopies. The mutual influence between must be considered if satisfies 3 . These results provide insights designing river projects.

Язык: Английский

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Bedload transport within a patchy submerged canopy with different patch densities and spatial configuration

Frontiers in Marine Science, Год журнала: 2025, Номер 12

Опубликована: Март 10, 2025

This study conducted laboratory experiments to investigate the bedload transport within a patchy submerged canopy across range of patch area densities and spatial configurations. The ( ϕp ), defined as bed fraction covered by patches, ranged from 0 0.56, while configurations varied channel-spanning patches laterally unconfined patches. At low density id="im2">ϕp< 0.3), id="im3">ϕp increased, more flow passed over top canopy, decreasing near-bed velocity. However, formation turbulent wakes around individual increased kinetic energy (TKE). These opposing trends led mild decrease in rate with increasing id="im4">ϕp . In contrast, at high id="im5">ϕp> both velocity TKE decreased id="im6">ϕp , resulting sharp rate. Furthermore, same id="im7">ϕp were associated lower transport, compared A predictive model for that incorporated mean provided accurate predictions than models based only on time-averaged (bed stress) or TKE.

Язык: Английский

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Impact of Stem Size on Turbulence and Sediment Resuspension Under Unidirectional Flow

Water Resources Research, Год журнала: 2021, Номер 57(3)

Опубликована: Фев. 17, 2021

Abstract Laboratory experiments examined the impact of model vegetation on turbulence and resuspension. The turbulent kinetic energy increased with increasing velocity solid volume fraction, but did not depend stem diameter. vegetation‐generated dominated total inside canopies. For same sediment size, critical at which resuspension was initiated for both vegetated bare beds, resulted in a that decreased fraction. Both had no dependence However, denser canopies and/or canopy smaller greater slope is required to initiate This study provides way predict onset regions vegetation, an important threshold transport landscape evolution.

Язык: Английский

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Carbon and Nitrogen Stocks and Burial Rates in Intertidal Vegetated Habitats of a Mesotidal Coastal Lagoon

Ecosystems, Год журнала: 2021, Номер 25(2), С. 372 - 386

Опубликована: Июнь 22, 2021

Язык: Английский

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Velocity, Turbulence, and Sediment Deposition in a Channel Partially Filled With a Phragmites australis Canopy

Water Resources Research, Год журнала: 2022, Номер 58(8)

Опубликована: Авг. 1, 2022

Abstract Laboratory experiments examined the longitudinal evolution of near‐bed velocity, turbulent kinetic energy (TKE), and net deposition in a model Phragmites australis canopy occupying 1/3 channel width. The canopies were constructed from P . with real morphology solid volume fraction between 0.003 0.018. An exponential was modified to predict velocity inside canopy, which TKE can be predicted. By combining predicted probability, we proposed distribution canopy. TKE, good agreement measurements. Relative an upstream reference, within enhanced when two conditions met: in‐canopy, smaller than critical value for resuspension, resuspension took place bare channel. Above vegetation density (defined by ϕ c ), spatially‐averaged surpassed that adjacent provides way estimate always diminished over some flow adjustment distance, L d (distance leading edge fully developed flow). When length greater 0.4 , canopy‐averaged relative Finally, same length, differences plant morphologies did not have strong impact on in‐canopy distribution.

Язык: Английский

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Grain shear stress and bed-load transport in open channel flow with emergent vegetation

Journal of Hydrology, Год журнала: 2023, Номер 618, С. 129204 - 129204

Опубликована: Фев. 2, 2023

Язык: Английский

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