Experimental and numerical assessment of transient stream–aquifer exchange during disconnection

Rivière, Agnès; Gonçalvès, Julio; Jost, Anne; Font, Marianne

doi:10.1016/j.jhydrol.2014.05.040

Cited by 37 publications

(43 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Summer dry conditions following wet winters represents a period in which Mediterranean rivers often transition from being gaining to losing rivers (Crosbie et al, ; Lamontagne et al, ; Oyarzún et al, ; Sapriza‐Azuri et al, ), particularly as groundwater levels decline (Lavers et al, ). As drying progresses, losing rivers can further transition from being hydraulically connected to the groundwater through a continuously saturated zone to being disconnected from the underlying aquifer by an unsaturated zone (Lamontagne et al, ; A. M. McCallum et al, ; Rivière et al, ; Su et al, ; Treese et al, ). Water table fluctuations associated with anthropogenic pumping and hydrological perturbations can induce oscillations between conditions of gaining and losing (Baratelli et al, ; Pryet et al, ), and disconnection/reconnection that may limit or enhance infiltration patterns and nutrient supply supporting increased reactive efficiencies within the hyporheic zone (Trauth & Fleckenstein, ).…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

et al. 2018

View full text Add to dashboard Cite

Rivers in climatic zones characterized by dry and wet seasons often experience periodic transitions between losing and gaining conditions across the river‐aquifer continuum. Infiltration shifts can stimulate hyporheic microbial biomass growth and cycling of riverine carbon and nitrogen leading to major exports of biogenic CO2 and N2 to rivers. In this study, we develop and test a numerical model that simulates biological‐physical feedback in the hyporheic zone. We used the model to explore different initial conditions in terms of dissolved organic carbon availability, sediment characteristics, and stochastic variability in aerobic and anaerobic conditions from water table fluctuations. Our results show that while highly losing rivers have greater hyporheic CO2 and N2 production, gaining rivers allowed the greatest fraction of CO2 and N2 production to return to the river. Hyporheic aerobic respiration and denitrification contributed 0.1–2 g/m2/d of CO2 and 0.01–0.2 g/m2/d of N2; however, the suite of potential microbial behaviors varied greatly among sediment characteristics. We found that losing rivers that consistently lacked an exit pathway can store up to 100% of the entering C/N as subsurface biomass and dissolved gas. Our results demonstrate the importance of subsurface feedbacks whereby microbes and hydrology jointly control fate of C and N and are strongly linked to wet‐season control of initial sediment conditions and hydrologic control of seepage direction. These results provide a new understanding of hydrobiological and sediment‐based controls on hyporheic zone respiration, including a new explanation for the occurrence of anoxic microzones and large denitrification rates in gravelly riverbeds.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Hence, regaining connection or the discharge state does not occur quickly as the infiltration rate is already at its maximal under losing-disconnected rivers (Brunner et al 2009) and a compensating effect cannot occur rapidly when the regional water table falls. However, the situation (disconnection to connection) here is different from most other conceptual modelling studies (Brunner et al 2009;Rivière et al 2014) where flow processes from connection to disconnection of the stream-aquifer are discussed for homogeneous and isotropic conditions. Under natural conditions with complex hydrological heterogeneity and with water table along the slope, flow processes may react quite differently than reported in these studies.…”

Section: Impact Of Low Permeability Layer Anisotropy and Water Tablementioning

confidence: 72%

“…6) at the stream interface was quickly transformed to a discharge state as long as the water table decrease was less than 1 m. This condition resembles the losing-connected stream, as described by Lamontagne et al (2014). In this situation, the water table is quickly raised near the river by increased infiltration rates, because of a large hydraulic gradient (Rivière et al 2014). However, a 2.0-m drawdown from the original position produced persistent losing conditions for much longer time (400 days, Fig.…”

Section: Impact Of Low Permeability Layer Anisotropy and Water Tablementioning

confidence: 95%

“…Normally, the estimation of SW-GW interactions in these studies (e.g. Doble et al 2012;Crosbie et al 2014;Rivière et al 2014) has been conducted assuming either homogeneous and isotropic conditions, or groundwater normal to the stream. However, biophysical modelling studies, with models calibrated and validated on data from sites involving multiple hydrogeological heterogeneities, such as anisotropic flow and/or the presence of poorly permeable layers, are scarce.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-Term Quantification of Stream-Aquifer Exchange in a Variably-Saturated Heterogeneous Environment

Phogat

Potter

Cox

et al. 2017

Water Resour Manage

View full text Add to dashboard Cite

A variably-saturated finite element model HYDRUS-2D was used to simulate the spatiotemporal dynamics of stream-aquifer exchange for a perennial stream flowing through an undulating catchment and underlain by heterogeneous geology. The model was first calibrated and validated using piezometric heads measured near the stream. The model was then used a) to quantify the long-term dynamics of exchange at stream-aquifer interface and the water balance in the domain, and b) to evaluate the impact of anisotropy of geological materials, thickness (w) and hydraulic conductivity (K s ) of the low permeability layer at the streambed, and water table fluctuations on the extent of exchange. Simulated pressure heads in the domain revealed that seasonal groundwater fluctuations were more pronounced near the stream. Daily discharge to the stream varied from 0.05 to 0.3 mm/day, annual discharge ranged from 59 to 74 mm, and the overall water balance showed a discharge (−54 mm) from the domain during 2000-2012. A fivefold increase in K s of the low permeability layer enhanced discharge to the stream by 14% (10 mm/year) whereas an increase in the thickness of the layer by 1 m had a low impact (2.4 mm/ year). A 2-m drawdown of the water table transformed a connected and gaining system into a

show abstract

“…The riverbank filtration processes are complicated by developing local hydraulically transitional or disconnected zones (Brunner et al, 2009) within initially fully connected stream-aquifer systems, in which unsaturated zones develop under streambeds due to intensive pumping from the WSWs (Filimonova and Shtengelov, 2013;Rivière et al, 2014). In addition, thermal effects are known to cause significant changes in the hydraulic conductivity because the flow's kinematic viscosity is temperature dependent (Anderson, 2005;Nutting, 1930).…”

Section: Regime Periodmentioning

confidence: 99%

Optimum experimental design of a monitoring network for parameter identification at riverbank well fields

Wang

Pozdniakov

Shestakov

2015

Journal of Hydrology

View full text Add to dashboard Cite

Keywords:Groundwater and surface water interactions Riverbank filtration Riverbed clogging Hydraulic conductivity MODFLOW s u m m a r y A steady-state flow regime in riverbank well fields is often violated by fluctuations in river stages and variations in groundwater extraction. In this study, a criterion of quasi-steady flow during filtration processes at riverbank well fields was introduced. Under the assumption of steady-state flow, an analytical approach for determining the key hydraulic parameters (aquifer transmissivity and riverbed filtration resistance) between a stream and a hydraulically connected aquifer during riverbank filtration was presented. An optimal regular observation network (consisting of the locations of monitoring wells and the observation regime), which is based on the model-oriented approach using an example of a riverbank well field near the Kuybyshev Reservoir, Russia, was designed to minimise the uncertainty in the estimates of hydraulic parameters. The analyses showed that the initial recession in the surface water levels for the simplest constant groundwater withdrawal patterns can be used to determine the key hydraulic parameters; the error in these estimated parameters was less than 7% or 12%, depending on the designed monitoring network. When comparing the two typical monitoring networks, observation line A-A that passes midway through the water supply wells performed better than observation line B-B that passes through the water supply wells when estimating the hydraulic parameters. The results of this study can be used as a reference for designing and optimising a monitoring network that aims to determine the key hydraulic parameters at riverbank well fields.

show abstract

Experimental and numerical assessment of transient stream–aquifer exchange during disconnection

Cited by 37 publications

References 22 publications

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

Long-Term Quantification of Stream-Aquifer Exchange in a Variably-Saturated Heterogeneous Environment

Optimum experimental design of a monitoring network for parameter identification at riverbank well fields

Contact Info

Product

Resources

About

Experimental and numerical assessment of transient stream–aquifer exchange during disconnection

Cited by 37 publications

References 22 publications

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO2 and N2

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO2 and N2

Long-Term Quantification of Stream-Aquifer Exchange in a Variably-Saturated Heterogeneous Environment

Optimum experimental design of a monitoring network for parameter identification at riverbank well fields

Contact Info

Product

Resources

About

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂