The effect of groundwater forcing on hyporheic exchange: Reply to comment on ‘Munz M, Krause S, Tecklenburg C, Binley A. Reducing monitoring gaps at the aquifer‐river interface by modelling groundwater‐surfacewater exchange flow patterns. <i>Hydrological Processes</i>. DOI: 10.1002/hyp.8080’

Krause, Stefan; Munz, Matthias; Tecklenburg, Christina; Binley, Andrew

doi:10.1002/hyp.9271

Cited by 10 publications

(7 citation statements)

References 42 publications

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“…Model‐based quantifications of HEF are necessary to gain mechanistic understanding, and therefore critical to consolidate observations, guide experimental design, and upscale processes at the reach and watershed scales [e.g., Munz et al ., ; Endreny and Lautz , ; Krause et al ., ; Gomez et al ., ]. Simplified model domains representing periodic triangular bed forms, dunes, and ripples of variable wavelengths, or even flat porous streambeds, have significantly improved our understanding of the impacts of advective pumping due to steady and unsteady turbulent flows in homogeneous sediments [ Cardenas and Wilson , ; Boano et al ., ], including the impact of groundwater upwelling [e.g., Cardenas and Wilson , ; Boano et al ., ].…”

Section: Introductionmentioning

confidence: 97%

Effect of low‐permeability layers on spatial patterns of hyporheic exchange and groundwater upwelling

Gomez‐Velez

Krause

Wilson

2014

Water Resources Research

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Bed form-induced hyporheic interactions are characterized by a nested system of flow paths that continuously exchange water, solutes, momentum, and energy. At the local scale, sediment heterogeneity plays a key role in the hydrodynamics and potential for biogeochemical transformations within the hyporheic zone. This manuscript explores the role of low-permeability sedimentary layers on the interplay between bed form-induced hyporheic exchange and groundwater upwelling. A hydrodynamic conceptualization that sequentially couples fully-turbulent flow in the water column and Darcian flow in the sediment is used. Low-permeability layers are characterized by long residence times and solute accumulation. Furthermore, these layers induce hydrodynamic sequestration due to the relocation and, in some cases, emergence of new stagnation zones. Spatial patterns of residence time distributions and flushing intensities indicate that the interface of the low-permeability layers has the potential to be a hot spot for biogeochemical transformations and flow acceleration near such interface can increase the mobilization capacity for the products of redox chemical and microbial processes. A discussion about the possible implications that hydrodynamic changes have on the biogeochemistry of hyporheic zones is presented; however, further biogeochemical experimentation and modeling are needed to validate these arguments.

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Section: Introductionmentioning

confidence: 97%

Effect of low‐permeability layers on spatial patterns of hyporheic exchange and groundwater upwelling

Gomez‐Velez

Krause

Wilson

2014

Water Resources Research

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“…However, GW flow path depth is a critical control on the susceptibility of seepage zones to climate warming [ Kurylyk et al ., ], therefore shallow lateral GW inflows to streams may be less thermally stable in the future than vertical discharge through the streambed from deeper, regional GW flow. In areas where GW is contaminated, upwelling areas represent point sources for pollution, impairing water quality and diminishing ecosystem function [ Krause et al ., ; Briggs et al ., ]; upwelling zone sediments may represent a “last line of defense” for shallow aquifer contamination where reactivity is enhanced due to dynamic sources of organic carbon and other reactants [ Seitzinger et al ., ]. In either the case of ecosystem benefit, or impairment, it is crucial to locate and quantify zones of focused GW discharge to SW.…”

Section: Introductionmentioning

confidence: 99%

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Briggs

Buckley

Bagtzoglou

et al. 2016

Water Resources Research

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Zones of strong groundwater upwelling to streams enhance thermal stability and moderate thermal extremes, which is particularly important to aquatic ecosystems in a warming climate. Passive thermal tracer methods used to quantify vertical upwelling rates rely on downward conduction of surface temperature signals. However, moderate to high groundwater flux rates (>−1.5 m d−1) restrict downward propagation of diurnal temperature signals, and therefore the applicability of several passive thermal methods. Active streambed heating from within high‐resolution fiber‐optic temperature sensors (A‐HRTS) has the potential to define multidimensional fluid‐flux patterns below the extinction depth of surface thermal signals, allowing better quantification and separation of local and regional groundwater discharge. To demonstrate this concept, nine A‐HRTS were emplaced vertically into the streambed in a grid with ∼0.40 m lateral spacing at a stream with strong upward vertical flux in Mashpee, Massachusetts, USA. Long‐term (8–9 h) heating events were performed to confirm the dominance of vertical flow to the 0.6 m depth, well below the extinction of ambient diurnal signals. To quantify vertical flux, short‐term heating events (28 min) were performed at each A‐HRTS, and heat‐pulse decay over vertical profiles was numerically modeled in radial two dimension (2‐D) using SUTRA. Modeled flux values are similar to those obtained with seepage meters, Darcy methods, and analytical modeling of shallow diurnal signals. We also observed repeatable differential heating patterns along the length of vertically oriented sensors that may indicate sediment layering and hyporheic exchange superimposed on regional groundwater discharge.

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“…The emergence of a systemic view of the hydrological cycle led to the concept of continental hydrosystem (Dooge, 1968;Kurtulus et al, 2011), which "is composed of storage components where water flows slowly (e.g. aquifers) and conductive components, where large quantities of water flow relatively quickly (e.g.…”

Section: Introductionmentioning

confidence: 99%

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

Flipo¹,

Mouhri²,

Labarthe³

et al. 2014

Preprint

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Abstract. Recent developments in hydrological modelling are based on a view of the interface being a single continuum through which water flows. These coupled hydrological-hydrogeological models, emphasising the importance of the stream–aquifer interface, are more and more used in hydrological sciences for pluri-disciplinary studies aiming at investigating environmental issues. This notion of a single continuum, which is accepted by the hydrological modellers, originates in the historical modelling of hydrosystems based on the hypothesis of a homogeneous media that led to the Darcy law. There is then a need to first bridge the gap between hydrological and eco-hydrological views of the stream–aquifer interfaces, and, secondly, to rationalise the modelling of stream–aquifer interface within a consistent framework that fully takes into account the multi-dimensionality of the stream–aquifer interfaces. We first define the concept of nested stream–aquifer interfaces as a key transitional component of continental hydrosystem. Based on a literature review, we then demonstrate the usefulness of the concept for the multi-dimensional study of the stream–aquifer interface, with a special emphasis on the stream network, which is identified as the key component for scaling hydrological processes occurring at the interface. Finally we focus on the stream–aquifer interface modelling at different scales, with up-to-date methodologies and give some guidances for the multi-dimensional modelling of the interface using the innovative methodology MIM (Measurements-Interpolation-Modelling), which is graphically developed, scaling in space the three pools of methods needed to fully understand stream–aquifer interfaces at various scales. The outcome of MIM is the localisation in space of the stream–aquifer interface types that can be studied by a given approach. The efficiency of the method is demonstrated with two approaches from the local (~1 m) to the continental (<10 M km2) scale.

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The effect of groundwater forcing on hyporheic exchange: Reply to comment on ‘Munz M, Krause S, Tecklenburg C, Binley A. Reducing monitoring gaps at the aquifer‐river interface by modelling groundwater‐surfacewater exchange flow patterns. Hydrological Processes. DOI: 10.1002/hyp.8080’

Cited by 10 publications

References 42 publications

Effect of low‐permeability layers on spatial patterns of hyporheic exchange and groundwater upwelling

Effect of low‐permeability layers on spatial patterns of hyporheic exchange and groundwater upwelling

Actively heated high‐resolution fiber‐optic‐distributed temperature sensing to quantify streambed flow dynamics in zones of strong groundwater upwelling

Continental hydrosystem modelling: the concept of nested stream–aquifer interfaces

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