Modeling Microplastic and Solute Transport in Vegetated Flows

Stride, Ben; Abolfathi, Soroush; Odara, M.G.N.; Bending, Gary D.; Pearson, Jonathan

doi:10.1029/2023wr034653

Cited by 24 publications

(1 citation statement)

References 71 publications

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“…However, in spite of this complicated relationship between suspended sediment and discharge, it can be hypothesized that the suspended sediment concentration correlates well with the peak of the direct surface runoff in main channel. This situation is valid not only for the suspended sediment transport (Silva et al., 2023; Wang et al., 2021), but also the bedload (Wu et al., 2021), and pollutant transport (Stride et al., 2023) in natural vegetated rivers.…”

Section: Introductionmentioning

confidence: 95%

Experimental Study on Influence of Different Patterns of an Emergent Vegetation Patch on the Flow Field and Scour/Deposition Processes in the Wake Region

Yagci,

Özgur Kirca,

Kitsikoudis

et al. 2023

Water Resources Research

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Flume experiments were conducted to comprehend the impact of different patterns of an emergent vegetation patch on the flow field and the scour process in natural rivers. Velocity measurements, flow visualization, and scour tests were undertaken around different vegetation patch patterns, which were simulated inspired by the expansion process of a typical instream vegetation. The patch expansion process was idealized with an initially circular patch of rigid emergent stems becoming elongated due to positive and negative feedbacks. The expansion of the vegetation patch was considered to occur in three stages, in which the density of the patch from the previous stage was increased while the patch was also elongated by connecting at its downstream side with another sparser vegetation patch. These stages were replicated succesively by increasing the density and elongating the patch. In this way, two processes (i.e., elongation and decrease in permeability), which usually have hydrodynamically opposite effects on flow fields, were simulated at the same obstruction. Despite generally elongated obstacles being streamlined bodies, the morphometric analysis obtained by laser scanner revealed that streamlined elongation of permeable patches amplifies global scour and enhances localization of the local scour hole. This situation implies that as the patch expands, in the wake region, the steady‐wake region becomes shorter, turbulence diminishes, lateral shear stress enhances, and deposition cannot occur far from the patch. Consequently, as the patch expands, the hydrodynamic consequences may restrict further patch expansion after a certain length/density.

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Section: Introductionmentioning

confidence: 95%

Experimental Study on Influence of Different Patterns of an Emergent Vegetation Patch on the Flow Field and Scour/Deposition Processes in the Wake Region

Yagci,

Özgur Kirca,

Kitsikoudis

et al. 2023

Water Resources Research

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Propagules go with the flow: Near‐field particle dispersion in reaches with different hydrodynamic conditions

Farrow,

Lim,

Ackerman

2024

Limnology & Oceanography

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We examined the effects of riverbed roughness and turbulence (shear velocity, ) on propagule dispersion in the near‐field region (< 100 m) by releasing microbead models of larval and juvenile unionid mussels in tributaries of the Grand River (Ontario, Canada). The Conestogo River had the roughest bed and highest mean , followed by the Grand and Speed rivers. We predicted more downstream transport with higher velocities and that longitudinal dispersion coefficients (Kx) would match the patterns in roughness and . The Conestogo River had the highest downstream particle flux and Kx as predicted by simple empirical equations. Inconsistent with model predictions, however, the Grand River had the lowest particle flux and Kx. These differences were greater than expected based on the small differences in reach‐averaged mean velocities between the Grand and Conestogo rivers. This mismatch between Kx predicted by simple empirical models and those fit to an advection–diffusion model was related to the inertial properties of the flow in the advective zone (i.e., near field) of the reaches. Streamwise, lateral, and especially vertical velocities at drift nets were spatially heterogeneous within and among reaches, demonstrating the influence of the flow direction on particle flux. Although bulk fluid statistics provided a useful indication of how dispersal distances vary among rivers, our results suggest that near‐field dynamics can be complex, requiring high‐resolution bathymetry and velocity data for the development of improved advection–diffusion models. Care should be exercised in predicting the dispersal of particles at ecologically relevant spatial scales in rivers.

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