Numerical plastic transport modelling in fluvial systems: Review and formulation of boundary conditions DOI Creative Commons
Charuni Wickramarachchi, Robert K. Niven, Matthias Kramer

et al.

Water Research, Journal Year: 2024, Volume and Issue: 273, P. 122947 - 122947

Published: Dec. 18, 2024

In recent years, it has become clear that plastic pollution poses a significant threat to aquatic environments and human health. Rivers act as entry points for land-based waste, while certain fraction of entrained plastics is carried into marine environments. As such, the accurate modelling transport processes in riverine systems plays crucial role developing adequate remediation strategies. this paper, we review two main multiphase flow numerical approaches used modelling, comprising Lagrangian Transport Models (LTMs) Eulerian (ETMs). Although LTMs ETMs can be regarded complementary equivalent approaches, focus on trajectories individual particles, whereas represent behaviour particles terms their mass or volume concentrations. Similar results are expected, our shows models yet improved, specifically with respect formulation implementation boundary conditions, interactions channel bed, river bank, free surface, well biota. We anticipate an these conditions will allow better representation different modes, including bed load, suspended surface load. Finally, provide suggestions future research directions, novel threshold detachment plastics, hope inspire community, thereby triggering new developments rapidly advancing field modelling.

Language: Английский

Bed Shear Stress and Near‐Bed Flow Through Sparse Arrays of Rigid Emergent Vegetation DOI Creative Commons
J. Aliaga, Jochen Aberle

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(4)

Published: April 1, 2024

Abstract Vegetation is an essential component of natural rivers and has significant effects on flow morphodynamic processes. Although progress been made in characterizing resistance vegetated flows, the impact vegetation bed shear stress, a key driver sediment transport, still needs better characterization understanding. This research, explores stress near‐bed characteristics sparse arrays rigid emergent cylinders mimicking over rough bed. For this purpose, novel adaptation plate was used to measure at canopy scale. These measurements were analyzed relation spatially averaged quantities for different array densities. The results show that, constant water depth, investigated cylinder enhances ratio between bulk velocity (i.e., Darcy‐Weisbach friction factor) compared unobstructed open‐channel that increases with density. Moreover, higher velocities observed On other hand, no influence values turbulent kinetic energy stresses observed. Finally, it shown thickness layer suitable parameter scale flows.

Language: Английский

Citations

4
Application of the entropy model to estimate flow discharge and bed load transport in a large river DOI
Shiva Rezazadeh, Mohammad Manafpour, Farhad Bahmanpouri

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(2)

Published: Feb. 1, 2025

The amount of sediment bed load being carried by rivers significantly impacts the inherent development riverine systems in terms hydrodynamic and morphodynamic changes. In this direction, acoustic Doppler current profiler velocity literature data collected at Óbidos station Amazon River were applied to investigate bed-load transport using Entropy method. First, cross-sectional distribution was estimated with that model for two scenarios source data: (a) all surface velocities (b) single as maximum velocity. latter analysis conducted different assumptions distribution: parabolic elliptic. error percentage estimation mean discharge 2.08% based on considering 4.08% 12.5% elliptic scenarios, respectively. Next, shear Shields mobility parameter calculated scenarios. Finally, dimensionless rate a range particle diameters. Applying equations various distributions, results from entropy method agreed experimental literature. Overall, study highlighted potential estimate river large relying only

Language: Английский

Citations

0
Effects of Leafy Flexible Vegetation and Bedforms on Turbulent Flow and Sediment Transport DOI Creative Commons
Calvani Artini G., Simona Francalanci, Luca Solari

et al.

Journal of Geophysical Research Earth Surface, Journal Year: 2025, Volume and Issue: 130(3)

Published: March 1, 2025

Abstract Recent studies have shown that vegetation can trigger sediment resuspension and facilitate movement, highlighting the possibility of finding a linkage between turbulence transport rates in vegetated areas. This study investigates flow hydrodynamics, through double‐averaged analysis, focusing on data were acquired experiments with dunes leafy flexible characterized by different Leaf Area Indices (LAI), which denotes total one‐sided leaf area per unit ground (). Flow velocity was measured under both fixed‐ mobile‐bed conditions, fixed‐bed physical model representing final topography from experiments. The results suggest turbulent kinetic energy conditions is approximately two to three times higher than comparable experimental conditions. Moreover, spatially depth‐averaged intensity across various setups correlated dimensionless factor derived dune height wavelength , being water depth. correlation remained effective all tested setups, dominant influence geometry compared drag. show applying turbulence‐based models leads an underestimation denser vegetation, whereas near‐bed values provide better agreement measurements. Furthermore, used update bed‐load model, incorporating dunes.

Language: Английский

Citations

0
On the Effects of Turbulence Modulation Driven by Suspended Sediment Stratification in Emergent Rigid Canopies DOI Creative Commons
Pallav Ranjan, Rafael O. Tinoco

Journal of Geophysical Research Earth Surface, Journal Year: 2024, Volume and Issue: 129(1)

Published: Jan. 1, 2024

Abstract Aquatic vegetation has the potential to increase suspended sediment capture while also increasing resuspension and bedload transport. Suspended can induce density stratification, which modulates turbulence in water column. We derive a Rouse‐based formulation for concentration (SSC) including effect of sediment‐induced stratification. perform Large Eddy Simulations vegetated non‐vegetated channels explicitly highlight stratification on SSC profiles. found that impact is dominant near‐bed region within bottom boundary layer, affecting both Stratification reduces likelihood sweep ejection events near bed may affect entrainment Modifications existing models transport are suggested account effects induced channels.

Language: Английский

Citations

3
Effects of Leafy Flexible Vegetation on Bed‐Load Transport and Dune Geometry DOI Creative Commons
Calvani Artini G., Simona Francalanci, Luca Solari

et al.

Water Resources Research, Journal Year: 2024, Volume and Issue: 60(10)

Published: Oct. 1, 2024

Abstract The development of sustainable river management strategies requires knowledge the effect vegetation on hydrodynamics and sediment transport. To date, complex physical processes involving combined effects leafy flexible mobile bedforms are not completely understood. Most transport models have been developed for bare bed conditions so that their performance in presence remains unclear. On other hand, recently consider vegetated but they typically account only rigid cylinders some cases scour at base. For this purpose, laboratory experiments were conducted with dune artificial plants varying Leaf Area Index to investigate morphology Sediment rates bedform characteristics such as height, wavelength celerity, measured specifically designed experimental runs. collected data show alters morphology, tending reduce average leading formation 3D geometries. Bed‐shear‐stress‐based predicting verified be valid under low roughness density. contrary, emphasize bed‐load rate increased higher frontal area. Recent channels provide a better interpretation dense less effective when predominant related dunes present.

Language: Английский

Citations

2
Incipient motion of sediment by turbulent kinetic energy in the presence of emergent vegetation in the outer sidewall of a bend DOI

Nasim Rismani,

Hossein Afzalimehr,

Seyed Amin Asghari Pari

et al.

ISH Journal of Hydraulic Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 9

Published: Dec. 30, 2024

This study examines the influence of vegetation on sediment movement in a 180° river bend with rigid emergent outer side. Using an Acoustic Doppler Velocimeter, researchers collected 504 velocity profiles under conditions and without vegetation, across four different densities. The findings indicate that reduces critical needed for by 59%. Additionally, presence increases turbulent kinetic energy, highest levels observed at lowest density, decreasing as density increases. pattern suggests not only modifies flow dynamics but also affects threshold transport, especially side bend. For example, energy is amplified 18 times 150-degree angle. In contrast, bare bed exhibited minimal underscoring significant role altering structures. highlights importance management control, demonstrating more pronounced effect than inner side, thus contributing to sustainability natural streams.

Language: Английский

Citations

1
Advanced intelligence model for prediction of sediment transport rate and friction factor in alluvial channel DOI

Mun Mun Basumatary,

Pritika Wary,

Soumen Maji

et al.

Multiscale and Multidisciplinary Modeling Experiments and Design, Journal Year: 2024, Volume and Issue: 7(6), P. 5915 - 5931

Published: Aug. 10, 2024

Language: Английский

Citations

0
Drag coefficients and water surface profiles in channels with arrays of linear rigid emergent vegetation DOI Creative Commons
Antonino D’Ippolito, Francesco Calomino,

Attilio Fiorini Morosini

et al.

Journal of Hydro-environment Research, Journal Year: 2024, Volume and Issue: 57, P. 27 - 37

Published: Oct. 2, 2024

Language: Английский

Citations

0
Numerical plastic transport modelling in fluvial systems: Review and formulation of boundary conditions DOI Creative Commons
Charuni Wickramarachchi, Robert K. Niven, Matthias Kramer

et al.

Water Research, Journal Year: 2024, Volume and Issue: 273, P. 122947 - 122947

Published: Dec. 18, 2024

In recent years, it has become clear that plastic pollution poses a significant threat to aquatic environments and human health. Rivers act as entry points for land-based waste, while certain fraction of entrained plastics is carried into marine environments. As such, the accurate modelling transport processes in riverine systems plays crucial role developing adequate remediation strategies. this paper, we review two main multiphase flow numerical approaches used modelling, comprising Lagrangian Transport Models (LTMs) Eulerian (ETMs). Although LTMs ETMs can be regarded complementary equivalent approaches, focus on trajectories individual particles, whereas represent behaviour particles terms their mass or volume concentrations. Similar results are expected, our shows models yet improved, specifically with respect formulation implementation boundary conditions, interactions channel bed, river bank, free surface, well biota. We anticipate an these conditions will allow better representation different modes, including bed load, suspended surface load. Finally, provide suggestions future research directions, novel threshold detachment plastics, hope inspire community, thereby triggering new developments rapidly advancing field modelling.

Language: Английский

Citations

0