Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone

Wolke, Philipp; Teitelbaum, Y.; Deng, Chao; Lewandowski, Jörg; Arnon, Shai

doi:10.3390/w12010062

Cited by 27 publications

(47 citation statements)

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“…This Special Issue consists of 20 original research papers . The majority of the contributions [3,5,[8][9][10][11][15][16][17][19][20][21][22][23] focus on the interactions between rivers or streams and groundwater. Three studies [6,13,14] investigate the interactions between lakes and groundwater, while two studies [4,18] deal with the exchange between groundwater and oceanic water.…”

Section: Overview Of the Special Issue Contributionsmentioning

confidence: 99%

“…Ward et al [20] used the resazurin-resorufin reactive tracer system to study aerobic microbial transformation at sediment-water interfaces and found that the resazurin-to-resorufin transformation rate was highest in youngest storage locations (i.e., that increasing residence times do not necessarily increase the reaction potential of solutes). Wolke et al [21] systematically studied the impact of bed form movements on oxygen dynamics in the hyporheic zone. The advantage of such flume studies is the ability to conduct analyses under well-controlled environmental parameters.…”

Section: Hyporheic Zone Studiesmentioning

confidence: 99%

“…The advantage of such flume studies is the ability to conduct analyses under well-controlled environmental parameters. However, Wolke et al [21] is the only study in this Special Issue using a lab flume for hyporheic research.…”

Section: Hyporheic Zone Studiesmentioning

confidence: 99%

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Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Lewandowski

Meinikmann

Krause

2020

Water

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The interactions of groundwater with surface waters such as streams, lakes, wetlands, or oceans are relevant for a wide range of reasons—for example, drinking water resources may rely on hydrologic fluxes between groundwater and surface water. However, nutrients and pollutants can also be transported across the interface and experience transformation, enrichment, or retention along the flow paths and cause impacts on the interconnected receptor systems. To maintain drinking water resources and ecosystem health, a mechanistic understanding of the underlying processes controlling the spatial patterns and temporal dynamics of groundwater–surface water interactions is crucial. This Special Issue provides an overview of current research advances and innovative approaches in the broad field of groundwater–surface water interactions. The 20 research articles and 1 communication of this Special Issue cover a wide range of thematic scopes, scales, and experimental and modelling methods across different disciplines (hydrology, aquatic ecology, biogeochemistry, environmental pollution) collaborating in research on groundwater–surface water interactions. The collection of research papers in this Special Issue also allows the identification of current knowledge gaps and reveals the challenges in establishing standardized measurement, observation, and assessment approaches. With regards to its relevance for environmental and water management and protection, the impact of groundwater–surface water interactions is still not fully understood and is often underestimated, which is not only due to a lack of awareness but also a lack of knowledge and experience regarding appropriate measurement and analysis approaches. This lack of knowledge exchange from research into management practice suggests that more efforts are needed to disseminate scientific results and methods to practitioners and policy makers.

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Section: Overview Of the Special Issue Contributionsmentioning

confidence: 99%

Section: Hyporheic Zone Studiesmentioning

confidence: 99%

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Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Lewandowski

Meinikmann

Krause

2020

Water

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“…Hydrologic dynamism in rivers occurs over a wide range of timescales [ Boano, et al ., 2015, Kirchner and Neal , 2013, Woessner , 2000]. Increasing attention has been paid to the impact of short term hydraulic perturbations, on the hours-to-days scale, such as those created by hydropeaking, tidal forces, evapotranspiration, and other highly dynamic processes [ Singh, et al ., 2019, Wolke, et al ., 2020]. These intricately linked and highly dynamic processes combine to control the concentrations of chemical markers related to biogeochemistry in the riverbed, particularly electron donors and acceptors [ Stegen, et al ., 2018].…”

Section: Introductionmentioning

confidence: 99%

Dissolved oxygen dynamics reveal biogeochemical tipping points driven by river corridor hydrology

Kaufman

Ghosh

Grate

et al. 2020

Preprint

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Riverbeds can have an important impact on large-scale fluxes of biogeochemically active solutes in river corridor systems. The hyporheic zone is an important area of both hydrology and biogeochemistry, particularly in a hydropeaked river system where rapid variations in river stage height, hydraulic gradients, and residence times occur. We measured several biogeochemical and hydrological parameters at three different subsurface depths in the riverbed of the Columbia River in Washington state, a complex hydropeaked river system with significant subsurface heterogeneity. During the study, episodes of significant dissolved oxygen (DO) change were observed. The DO signal changes were the most apparent, compared to more modest changes in other biogeochemical markers. While DO is often associated with biological activity, we ultimately found that the notable DO excursions were associated with hydrologic gradients. Here we describe hydrologic perturbations and biogeochemical responses in terms of hydrobiogeochemical regimes. Two different forms of DO response to hydraulic gradient perturbation were observed, defining different hydrobiogeochemical regimes. The system tips abruptly from one regime to the other, exhibiting threshold behavior that is uncaptured in current estimations of cumulative influences of subsurface processes from reach to earth system scales.Plain language summaryThe water in a river is constantly flowing in and out of the river’s bed. While it is in the bed, microbes process environmentally and ecologically important nutrients and other compounds. The exchange of water between the river and the riverbed is largely controlled by the stage of the river. Many processes, both natural and human, can cause rapid changes in the river stage. These rapid stage changes can cause abrupt changes in the riverbed’s ability to process nutrients and other compounds. In this study, we use dissolved oxygen as a window into riverbed microbial and chemical processing. We see that relatively rapid changes in river stage can cause abrupt changes in the concentrations of chemicals in the riverbed, indicating fundamental changes in how the riverbed processes are occurring. Understanding these abrupt and fundamental changes is important to our overall understanding of the ecological function of river corridor systems.3 key pointsA hydrobiogeochemical regime is defined by the functional form of the relationship of a hydrologic perturbation and biogeochemical marker.Short-term hydrologic perturbations drive tipping points between distinct hydrobiogeochemical regimes.Linear and hysteretic dissolved oxygen dynamics define distinct regimes as observed throughout the hyporheic zone.

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“…Galloway et al (2019) evaluated oxygen dynamics under unsteady flow with various gaining and losing conditions and evaluated oxygen concentrations with the planar optode to calculate oxygenated areas. Likewise, Wolke et al (2020) quantify oxygenated areas to determine oxygen dynamics and consumption based on migrating bedforms (i.e., bedform celerity). While these studies have helped understand oxygen dynamics in the hyporheic zone, they do not analyze mixing‐dependent reactions.…”

Section: Introductionmentioning

confidence: 99%

Abiotic Mixing‐Dependent Reaction in a Laboratory Simulated Hyporheic Zone

Santizo

Widdowson

Hester

2020

Water Resources Research

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Groundwater (GW) contaminants upwelling toward surface water (SW) can attenuate in the hyporheic zone, with dissolved oxygen (DO) frequently controlling the attenuation. In a laboratory mesocosm, we induced downwelling of SW into the sediments to create a hyporheic flow cell (HFC). We added DO to downwelling SW and sodium sulfite (Na 2 SO 3) to anoxic upwelling GW to induce an abiotic mixing-dependent reaction along the mixing zone between the HFC and upwelling GW. Using planar optodes and SO 4 measurements, we observed movement of the DO mixing zone (oxic front position), extent of DO mixing (mixing zone thickness), and location of MD reaction (SO 4 peak concentration). Oxic front position and mixing zone thickness were stable during nonreactive control experiments, indicating that dispersion of DO across the mixing zone had come into equilibrium with supply of DO to the mixing zone. By contrast, mixing zone thickness shrank over time during the reaction experiments, as MD reaction consumed DO in the mixing zone. The decrease in mixing zone thickness for the reaction experiments indicates steeper DO gradients and greater dispersion (transport) limitation, quantified by Damköhler numbers farther above unity. Maximum SO 4 concentrations always occurred further from the center of the HFC (i.e., more toward surrounding upwelling GW) than did the oxic front. In most riverbeds, transport and mixing dynamics are thus superimposed upon existing hydraulic dynamics, with implications for monitoring and attenuation of contaminants. Plain Language Summary Groundwater (GW) contaminants approaching surface water (SW) can be removed in shallow sediments (hyporheic zone), with dissolved oxygen (DO) frequently a controlling factor in the removal. These reactions sometimes require mixing of chemicals coming from SW and GW. We simulated such a mixing zone in shallow laboratory sediments, including (1) a nonreactive control experiment where DO coming from SW mixed with water without DO coming from deeper GW and (2) a nonbiological mixing-dependent reaction of sodium sulfite (Na 2 SO 3) in GW with DO in SW to produce sulfate (SO 4). We found that the concentration patterns for the control experiments were stable over time, but those for the reaction experiments were more dynamic. This was confirmed by differences in location of peak product (SO 4) concentration and that of the current DO mixing zone. Thus, in most riverbeds, transport and mixing dynamics are superimposed upon hydraulic dynamics, with implications for monitoring and attenuation of GW contaminants approaching surface water.

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Impact of Bed Form Celerity on Oxygen Dynamics in the Hyporheic Zone

Cited by 27 publications

References 50 publications

Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Groundwater–Surface Water Interactions: Recent Advances and Interdisciplinary Challenges

Dissolved oxygen dynamics reveal biogeochemical tipping points driven by river corridor hydrology

Abiotic Mixing‐Dependent Reaction in a Laboratory Simulated Hyporheic Zone

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