An Analysis of the Factors Affecting Hyporheic Exchange based on Numerical Modeling

Ren, Jie; Wang, Xiuping; Zhou, Yongqiang; Chen, Bin; Men, Lili

doi:10.3390/w11040665

Cited by 10 publications

(6 citation statements)

References 61 publications

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“…A 2D numerical model was implemented to couple the surface flow field (described by the Navier-Stokes equations with L-VEL turbulence closing model) with the underlying flow in the porous media (described by the Brinkman equations) (Ren et al 2019a;O'Connor et al 2008). The Brinkman equations account for the laminar momentum transfer in terms of kinetic and viscous forces at the interface between the two flow domains.…”

Section: Coupled Surface Water and Pore-water Flow Modelmentioning

confidence: 99%

Hyporheic exchange in recirculating flumes under heterogeneous bacterial and morphological conditions

et al. 2021

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Hyporheic exchange (HE) contributes to the biogeochemical turnover of macro- and micro-pollutants in rivers. However, the spatiotemporal complexity and variability of HE hinder understanding of its role in the overall functioning of riverine ecosystems. The present study focuses on investigating the role of bacterial diversity and sediment morphology on HE using a multi-flume experiment. A fully coupled surface–subsurface numerical model was used to highlight complex exchange patterns between surface water and the underlying flow field in the sediments. Under the experimental conditions, the surface water flow induced by bedforms has a prominent effect on both local trajectories and residence time distributions of hyporheic flow paths, whereas mean hyporheic retention times are mainly modulated by average surface flowrates. In case of complex bedform morphologies, the numerical model successfully reproduces the HE estimated by means of salt dilution tests. However, the 2D numerical representation of the system falls short in predicting HE in absence of bedforms, highlighting the intrinsic complexity of water circulation patterns in real scenarios. Finally, results show that higher bacterial diversities in the stream sediments can significantly reduce hyporheic fluxes. This work provides a framework to interpret micropollutants turnover in light of the underlying physical transport processes in the hyporheic zone. The study emphasizes the importance of better understanding the tradeoff between physically driven transport processes and bacterial dynamics in the hyporheic zone to quantify the fate of pollutants in streams and rivers.

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Section: Coupled Surface Water and Pore-water Flow Modelmentioning

confidence: 99%

Hyporheic exchange in recirculating flumes under heterogeneous bacterial and morphological conditions

et al. 2021

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“…Integration of theoretical advances into modelling studies is urgently required. Although the understanding of HZ processes has improved over the past decades, most numerical models still use different model concepts for groundwater and turbulent open channel flow, assuming hydrostatic pressure distributions, and couple these models [124,[224][225][226][227][228][229][230][231][232]. Until now, only a few fully integrated surface water-groundwater flow models exist, such as HydroGeoSphere [233] or the solver porousInter by Oxtoby et al [234].…”

Section: Innovative Modelling Approachesmentioning

confidence: 99%

Is the Hyporheic Zone Relevant beyond the Scientific Community?

Lewandowski

Arnon

Banks

et al. 2019

Water

137

102

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Rivers are important ecosystems under continuous anthropogenic stresses. The hyporheic zone is a ubiquitous, reactive interface between the main channel and its surrounding sediments along the river network. We elaborate on the main physical, biological, and biogeochemical drivers and processes within the hyporheic zone that have been studied by multiple scientific disciplines for almost half a century. These previous efforts have shown that the hyporheic zone is a modulator for most metabolic stream processes and serves as a refuge and habitat for a diverse range of aquatic organisms. It also exerts a major control on river water quality by increasing the contact time with reactive environments, which in turn results in retention and transformation of nutrients, trace organic compounds, fine suspended particles, and microplastics, among others. The paper showcases the critical importance of hyporheic zones, both from a scientific and an applied perspective, and their role in ecosystem services to answer the question of the manuscript title. It identifies major research gaps in our understanding of hyporheic processes. In conclusion, we highlight the potential of hyporheic restoration to efficiently manage and reactivate ecosystem functions and services in river corridors.

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“…A vegetation patch can be present in a gravel bed when there is a sand or silt layer under the gravel layer below the SWI (Jahadi et al, 2019). Although the permeability of the sediment selected in this study was relatively large considering the calculation load, the qualitative law can, to a certain extent, also guide hyporheic exchange in the low‐permeability sediment layer containing vegetation patches (Ren et al, 2019). In addition, to study the relationship between the hyporheic exchange flux and permeability as well as the Reynolds number of the overlying water, under the condition of not activating the solute transport channel and changing the particle size of the sediment and average velocity of the incoming flow, 30 groups of conditions were simulated (see Section 3.3 for details).…”

Section: Methodsmentioning

confidence: 99%

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

Gao

Sun

2022

Hydrological Processes

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Vegetation patches increase the pressure gradient of local channels and can create an uneven pressure distribution at the water–sediment interface, thereby driving hyporheic exchange. However, this process has rarely been discussed. We investigated the spatiotemporal characteristics of hyporheic exchange under the influence of multiple factors. A bidirectional coupling model of the overlying water and sediment with an emergent vegetation patch was adopted. The results show that hyporheic exchange driven by vegetation patches are spatially heterogeneous. The active area of hyporheic exchange was concentrated directly below the vegetation patch. A finger flow was formed at the edge of the active hyporheic exchange zone as the exchange took place. Furthermore, intermittent downward solute transport path (IDSTP) was formed downstream of the vegetation patch, and the exchange rate was one order of magnitude smaller than that of the hyporheic exchange active zone. Hyporheic exchange occurred at the stem and patch scales when the vegetation density was relatively high. There was a logarithmic relationship between the hyporheic exchange flux and sediment permeability, and a power function relationship existed between the hyporheic exchange flux and Reynolds number. The active area of hyporheic exchange will help predict pollutant transport and understand vegetation's nutrient absorption process. IDSTP will provide references for vegetation patch expansion.

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An Analysis of the Factors Affecting Hyporheic Exchange based on Numerical Modeling

Cited by 10 publications

References 61 publications

Hyporheic exchange in recirculating flumes under heterogeneous bacterial and morphological conditions

Hyporheic exchange in recirculating flumes under heterogeneous bacterial and morphological conditions

Is the Hyporheic Zone Relevant beyond the Scientific Community?

Numerical simulation of hyporheic exchange driven by an emergent vegetation patch

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