Journal Article10.1029/2020WR027719
Local and Reach-Scale Hyporheic Flow Response From Boulder-Induced Geomorphic Changes
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About: This article is published in Water Resources Research. The article was published on 01 Oct 2020. The article focuses on the topics: Scale (ratio).
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Citations
Integrated Numerical Modeling to Quantify Transport and Fate of Microplastics in the Hyporheic Zone
Abstract: Despite the significance of rivers and streams as pathways for microplastics (MP) entering the marine environment, limited research has been conducted on the behavior of MP within fluvial systems. Specifically, there is a lack of understanding regarding the infiltration and transport dynamics of MP across the streambed interface and within the hyporheic sediments. In this study, transport and retention of MP are investigated using a new numerical modeling approach. The model is built as a digital twin of accompanying flume experiments, which are used to validate the simulation results. The model accurately represents particle transport in turbulent water flow and within the hyporheic zone (HZ). Simulations for transport and infiltration of 1 µm MP particles into a sandy streambed demonstrate that the advection-dispersion equation can be used to adequately represent particle transport for pore-scale sized MP within the HZ. To assess the applicability of the modeling framework for larger MP, the experiment was repeated using 10 µm particles. The larger particles exhibited delayed infiltration and transport behavior, and while the model successfully represented the spatial extent of particle transport through the HZ, it was unable to fully replicate hyporheic transit times. This study is the first to combine explicit validation against experimental data, encompassing qualitative observations of MP concentration patterns and quantification of fluxes. By that, it significantly contributes to our understanding of MP transport processes in fluvial systems. The study also highlights the advantages and limitations of employing a fully integrated modeling approach to investigate the transport and retention behavior of MP in rivers and streams.
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Experimentally Mapping Water Surface Elevation, Velocity, and Pressure Fields of an Open Channel Flow Around a Stalk
TL;DR: In this paper , the authors report the first experimental investigation of reconstructed water surface elevations and three-dimensional time-averaged velocity and pressure fields quantified with non-invasive image techniques for a 3D free surface flow around a barely submerged vertical cylinder over a plane bed of coarse granular sediment in a full-scale flume experiment.
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Experimentally Mapping Water Surface Elevation, Velocity, and Pressure Fields of an Open Channel Flow Around a Stalk
TL;DR: In this paper , the authors report the first experimental investigation of reconstructed water surface elevations and three-dimensional time-averaged velocity and pressure fields quantified with non-invasive image techniques for a 3D free surface flow around a barely submerged vertical cylinder over a plane bed of coarse granular sediment in a fullscale flume experiment.
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Numerical simulation of hyporheic exchange driven by an emergent vegetation patch
TL;DR: In this article , the spatiotemporal characteristics of hyporheic exchange under the influence of multiple factors were investigated, and the results showed that hyporhesic exchange driven by vegetation patches are spatially heterogeneous.
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References
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Channel classification, prediction of channel response, and assessment of channel condition
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