Solute transport characteristics in the streambed due to rigid non-submerged plants: Experiment and simulations

Jiang, Qihao; Zhang, Siyi; Zhang, Bo; Yang, Yihang; Zhang, Zhongtian; Chen, Hexiang; Tang, Hongwu

doi:10.1016/j.jhydrol.2023.129315

Cited by 5 publications

(5 citation statements)

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“…Besides altering the surface flow, vegetation can impact the fate and transport of solutes and particles by altering hyporheic exchange, which involves the exchange of surface and subsurface water and associated chemicals [ 33 , [46] , [47] , [48] ]. Hyporheic exchange occurs when surface water infiltrates into the sediment bed and subsequently returns to the surface water due to a spatial pressure head gradient at the sediment-water interface [ 7 , 183 ].…”

Section: Impact Of Vegetation On Hyporheic Exchangementioning

confidence: 99%

“…In addition, the slowdown of the flow at the upstream side of each vegetation stem can induce a vertical pressure gradient that drives surface water into the sediment bed at the upstream side of the stem and then back to the surface water at the downstream side of the stem [ 49 ] ( Fig. 5 ) These stem-scale heterogeneity and vertical flux contribute to the exchange between surface and subsurface water or hyporheic exchange [ 48 , 187 ]. Second, at the same mean flow velocity, vegetation generates additional turbulence (see Section 3.2 for details), which can increase dispersion at the sediment-water interface and thus increase hyporheic exchange [ 33 ].…”

Section: Impact Of Vegetation On Hyporheic Exchangementioning

confidence: 99%

“…In addition to surface water, vegetation has been shown to impact the exchange of solutes and particles between surface water and subsurface water in the hyporheic zone [ 33 , [46] , [47] , [48] ]. Such impacts can be attributed to the vegetation-induced pressure gradient at the scale of vegetation stem size [ 48 , 49 ], the vegetation-generated turbulence [ 33 ], and the vegetation-induced pressure gradient at the patch scale. Understanding these mechanisms' roles in solute and particle transport regulation is crucial for preserving and restoring the stability and health of aquatic ecosystems with vegetation.…”

Section: Introductionmentioning

confidence: 99%

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Solute flow and particle transport in aquatic ecosystems: A review on the effect of emergent and rigid vegetation

Yang

2024

Environmental Science and Ecotechnology

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Section: Impact Of Vegetation On Hyporheic Exchangementioning

confidence: 99%

Section: Impact Of Vegetation On Hyporheic Exchangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solute flow and particle transport in aquatic ecosystems: A review on the effect of emergent and rigid vegetation

Yang

2024

Environmental Science and Ecotechnology

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“…At small scales, the hyporheic flow characteristics exert a dominant control on denitrification process (Gomez-Velez et al, 2015), which in turn, could be modulated by a range of abiotic (e.g., bed morphology, flow velocity) and biotic (e.g., faunal organisms, vegetation) in-stream processes (Huang & Yang, 2022;Mason & Sanders, 2021;Nikolakopoulou et al, 2018;Shrivastava et al, 2021a;Yuan et al, 2021). The abiotic processes have received a lot of attention in the past (Bardini et al, 2012;Ping et al, 2020), however, the research on the role of biotic processes in altering surfacegroundwater exchanges in streams has gained momentum only recently (Jin et al, 2023;Y. Liu et al, 2019;Shrivastava et al, 2021b;Sun et al, 2024).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Removal of River‐Borne Nitrate in Bioturbated Hyporheic Zone

Jiang,

Shrivastava,

Jin

et al. 2024

Geophysical Research Letters

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The influence of bioturbation induced by bottom‐dwelling macrozoobenthos on nitrogen dynamics in lotic stream sediments remains unclear. In this work, we advance the understanding of faunal bioturbation in lotic environments by developing a fully‐coupled flow and multicomponent reactive transport model and investigate the influence of sediment reworking and burrow ventilation processes on nitrogenous transformations. The model results indicate that sediment reworking and burrow ventilation significantly increase nitrate (NO3−) influx, penetration depth, and reaction rates in the streambed. Denitrification rates were observed up to three times higher in beds with U‐shaped burrows compared to flatbeds. The ratio of mound height to stream water depth ratio (h/H0) is a dominant control on determining the relative importance of the sediment reworking and burrow ventilation processes in modulating nitrogenous reactions. A power‐law scaling framework is ultimately proposed to predict NO3− removal efficiency based on the Damköhler number in bioturbated lotic streambeds.

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“…Hyporheic flows can be induced by many factors, such as bed forms (Buffington & Tonina, 2009; Dudunake et al., 2020; Elliott & Brooks, 1997; Marion et al., 2002; Packman et al., 2004; Tonina & Buffington, 2007), channel sinuosity (Boano et al., 2006; Cardenas, 2009), turbulence (Roche et al., 2018, 2019; Rousseau & Ancey, 2020; Voermans et al., 2017, 2018b), and in‐channel components like vegetation (Huang & Yang, 2022; Jin et al., 2023; Yuan et al., 2021) and in‐stream wood (Ader et al., 2021; Doughty et al., 2020; Lautz et al., 2006; Sawyer et al., 2011; Wilhelmsen et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Impacts of Channel‐Spanning Log Jams on Hyporheic Flow

Huang,

Yang

2023

Water Resources Research

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In‐stream wood structures, such as single logs, river steps, and debris dams, are known to drive hyporheic flow, defined as the flow that goes into the subsurface region and then back to the free‐flowing surface water. The hyporheic flow plays an important role in regulating water quality and biogeochemical cycles in rivers. Here, we investigated the impact of a channel‐spanning porous log jam, representing piles of wood logs, on hyporheic flow through a combination of direct visualization and theories. Specifically, we developed a method using refractive index‐matched sediment to directly visualize the hyporheic flow around and below a porous log jam, formed by piles of cylindrical rods, in a laboratory flume. We tracked the velocity of a fluorescent dye moving through the transparent sediment underneath the log jam. In addition, we measured the water surface profile and the spatially varying flow velocity near the log jam. Our results show that the normalized log jam‐induced hyporheic flux remained smaller than 10% at Froude numbers () below 0.06 and increased by a factor of five with increasing at . We combined the mass and momentum conservation equations of surface flow with Darcy's equation to explain the dependency of the log jam‐induced hyporheic flux on . Further, we observed that at , the water surface dropped noticeably and the turbulent kinetic energy increased immediately on the downstream side of the log jam. These findings will facilitate future quantification of hyporheic flow caused by channel‐spanning porous log jams.

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Solute transport characteristics in the streambed due to rigid non-submerged plants: Experiment and simulations

Cited by 5 publications

References 50 publications

Solute flow and particle transport in aquatic ecosystems: A review on the effect of emergent and rigid vegetation

Solute flow and particle transport in aquatic ecosystems: A review on the effect of emergent and rigid vegetation

Enhanced Removal of River‐Borne Nitrate in Bioturbated Hyporheic Zone

Impacts of Channel‐Spanning Log Jams on Hyporheic Flow

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