Model‐Based Analysis of the Effects of Dam‐Induced River Water and Groundwater Interactions on Hydro‐Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone

Yang, Chen; Zhang, You‐Kuan; Liu, Yuanyuan; Yang, Xiaofan; Liu, Chongxuan

doi:10.1029/2018wr023286

Cited by 34 publications

(18 citation statements)

References 38 publications

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“…The intrusion of Cr‐free river water from the 100‐D area would dilute and disperse the Cr plume along the flow path, which eventually is discharged back to the river at the 100‐H area (Figure b). River intrusion would also bring in more dissolved oxygen and dissolved organic carbon which enhances microbial activities in the subsurface and mobilizes Cr (Yang et al, ). Another source of Cr was identified at the 100‐BC area (Hartman, ) along the preferential flow path of river water intrusion.…”

Section: Resultsmentioning

confidence: 99%

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

Shuai

Song

Hammond

et al. 2019

Water Resources Research

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Hydrologic exchange flows (HEFs) across the river‐aquifer interface have important implications for biogeochemical processes and contaminant plume migration in the river corridor, yet little is known about the hydrogeomorphic factors that control HEFs dynamics under dynamic flow conditions. Here, we developed a 3‐D numerical model for a large regulated river corridor along the Columbia River to study how HEFs are controlled by the interplays between dam‐regulated flow conditions and hydrogeomorphic features of such river corridor system. Our results revealed highly variable intra‐annual spatiotemporal patterns in HEFs along the 75‐km river reach, as well as strong interannual variability with larger exchange volumes in wet years than dry years. In general, the river was losing during late spring to early summer when the river stage was high, and river was gaining in fall and winter when river stage was low. The magnitude and timing of river stage fluctuations controlled the timing of high exchange rates. Both river channel geomorphology and the thickness of a highly permeable river bank geologic layer controlled the locations of exchange hot spots, while the latter played a dominant role. Dam‐induced, subdaily to daily river stage fluctuations drove high‐frequency variations in HEFs across the river‐aquifer interfaces, resulting in greater overall exchange volumes as compared to the case without high‐frequency flows. Our results demonstrated that upstream dam operations enhanced the exchange between river water and groundwater with strong potential influence on the associated biogeochemical processes and on the fate and transport of groundwater contaminant plumes in such river corridors.

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Section: Resultsmentioning

confidence: 99%

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

Shuai

Song

Hammond

et al. 2019

Water Resources Research

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“…The deepening of the oxic‐anoxic interface and the reduction of the anoxic area due to the variable‐density flow also could be detrimental to a cascade of redox reactions, such as nitrate reduction (Jiang, Jin, Tang, Xu, Wei, & Li, 2021, 2022), iron reduction and sulfate reduction (Dwivedi et al., 2018; Ng et al., 2020), that are responsible for the bioreactor ability of the hyporheic zone to transform nutrients and pollutants not only from stream water (Yang et al., 2018) but also from groundwater (Hester et al., 2014). The enhanced downwelling flow of low Da·Ra −2 systems decreases the anoxic area and provides additional hindrance for mixing‐dependent reactions of upwelling groundwater pollutants, such as chlorinated ethenes (Weatherill et al., 2018).…”

Section: Discussionmentioning

confidence: 99%

Transition Zone Morphology Dynamics of Dissolved Oxygen (DO) in a Salinity‐Impacted Hyporheic Zone

Jiang

Kaufman

Jin

et al. 2022

Geophysical Research Letters

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Freshwater salinization is a common yet underappreciated environmental problem in rivers, yet how this process impacts the transport of dissolved oxygen (DO) in the hyporheic zone remains unknown. Using flume experiments and numerical simulations, we have demonstrated that the morphological dynamics of the DO transition zone are controlled by the dimensionless number Da·Ra−2, a measure of the rate of aerobic respiration to free convection. At low Da·Ra−2, the oxic front breaks up into fingers which subsequently grow, and leads to accelerating of DO transport and shrinking of the anaerobic zone in the underlying sediment. As Da·Ra−2 increases, the growth rate of the instability decreases, and the DO plume fingers are suppressed and delayed compared with the saltwater‐freshwater interface, the mixing area between saltwater and freshwater. These results indicate that the freshwater salinization syndrome can have significant impacts on the functioning of aquifer ecosystems unless regulated and managed effectively.

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“…Our model does not explicitly include such inputs, but the assumed POC distribution and hydrolysis rates were constrained to reproduce observed CH4 distributions. A crucial question for the next generation of watershed hydrobiogeochemical models will be how to dynamically link sources of POC input to sediment metabolism 34,60 .…”

Section: Discussionmentioning

confidence: 99%

Vertical hydrologic exchange flows control methane emissions from riverbed sediments

Stegen

Villa²,

Bohrer

et al. 2022

Preprint

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CH4 emissions from inland waters are highly uncertain in the current global CH4 budget, especially for the lotic systems like rivers. Previous studies have attributed the strong spatiotemporal heterogeneity of riverine CH4 to different environmental factors through correlation analysis. However, a mechanistic understanding for such heterogeneity is lacking. Here we combine sediment CH4 data with a biogeochemical-transport model to show that vertical hydrologic exchange flows (VHEFs), driven by the difference between river stage and groundwater level, determine CH4 flux at the sediment-water interface. CH4 fluxes show a nonlinear relationship with the magnitude of VHEFs. In addition, VHEFs lead to the hysteresis of temperature rise and CH4 emissions because high river discharge leads to strong downwelling flow that offsets increasing CH4 production with temperature rise. Our findings reveal how the interplay between hydrologic flux and microbial metabolic pathways that compete with methanogenic pathways can produce complex patterns in CH4 production and emission in riverbed sediments.

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Model‐Based Analysis of the Effects of Dam‐Induced River Water and Groundwater Interactions on Hydro‐Biogeochemical Transformation of Redox Sensitive Contaminants in a Hyporheic Zone

Cited by 34 publications

References 38 publications

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

Transition Zone Morphology Dynamics of Dissolved Oxygen (DO) in a Salinity‐Impacted Hyporheic Zone

Vertical hydrologic exchange flows control methane emissions from riverbed sediments

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