Unsaturated hyporheic zone flow in stream/aquifer conjunctive systems

Fox, Garey A.; Durnford, Deanna S.

doi:10.1016/s0309-1708(03)00087-3

Cited by 68 publications

(67 citation statements)

References 18 publications

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“…This agrees well with field observations, when no signs of a clogging layer were found. So despite an unsaturated zone beneath the streambed, we are in a temporary connected stream-aquifer regime, a state defined as a transitional by Fox and Durnford (2003) and Brunner et al (2009a), since a fully connected stream only occurs when fully saturated conditions occur beneath the stream, which is clearly not our case.…”

Section: Stream Aquifer Connectednessmentioning

confidence: 93%

“…Infiltration fluxes may also be obtained through modelling surface water-groundwater interactions, where groundwater levels are measured in piezometers surrounding a stream, and are used with stream head measurements to calibrate analytical or numerical models, from which infiltration fluxes are estimated (Fox and Durnford, 2003). However, this procedure is likely to be misleading: Although numerical models calibrated only to groundwater heads can achieve good calibration results, it is often impossible to know if modelled infiltration is an accurate estimate of real infiltration.…”

Section: Introductionmentioning

confidence: 99%

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Importance of stream infiltration data for modelling surface water–groundwater interactions

Batlle-Aguilar

Xie

Cook

2015

Journal of Hydrology

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Section: Stream Aquifer Connectednessmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Importance of stream infiltration data for modelling surface water–groundwater interactions

Batlle-Aguilar

Xie

Cook

2015

Journal of Hydrology

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“…However, an assumption made in many approaches in quantifying the seepage flow of a surface water compartment such as a stream, a lake or a wetland, is that the flow is saturated. As pointed out in Osman and Bruen (2002), Fox and Durnford (2003) and Brunner et al (2009), the flow regime under the surface water body can become unsaturated. In this case, methods based on the assumption of saturated flow may lead to incorrect predictions of the seepage fluxes.…”

Section: Introductionmentioning

confidence: 91%

“…Fox and Durnford (2003) have identified three stages of connectivity: connected, transitional, and disconnected ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal aspects of the transition from connection to disconnection between rivers, lakes and groundwater

Brunner

Simmons

Cook

2009

Journal of Hydrology

110

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KeywordsSurface water groundwater interaction Losing streams Disconnection Infiltration rates s u m m a r y A changing groundwater table can affect the flow regime between surface water and groundwater. Quantitative approaches are required to understand how such changes influence the flow regime. While in a fully connected regime changes in the groundwater table are related linearly to changes of the infiltration rate, in a disconnected regime the infiltration rate is essentially independent of such changes. However, transitional regimes between connected and disconnected regimes also exist and we identify different transitional pathways. We illustrate how hydrological parameters determine the pathway of transition and show that spatial variations of the infiltration flux through a surface water body strongly depends on these different pathways of transition. Moreover, the spatial distribution of seepage through a surface water body is shown to depend on the state of connection. We also show that the transition from a connected to disconnected flow regime may require a significant drop of the groundwater table. The study demonstrates that the transition zone may be of greater importance than is usually acknowledged. A comparison of lakes and rivers reveals that the latter are less likely to disconnect in response to a decrease of the regional groundwater table. We relate this behavior to differences in the build-up of a groundwater mound in 2D and 3D. Finally, we carry out some simple transient simulations for 3D systems to analyse the transient behavior of surface water groundwater interaction in the context of disconnection. We show that the state of connection is a critical variable in the dynamics of infiltration in a non-steady system.

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“…Fox and Durnford, 2003;Brunner et al, 2009a,b;Banks et al, 2011). Fox and Durnford (2003) investigated the formation of an unsaturated zone beneath a partially penetrating stream caused by nearby groundwater extraction. Banks et al (2011) analyzed the impact of land clearance and revegetation on the state of connection for perennial streams.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous or homogeneous? Implications of simplifying heterogeneous streambeds in models of losing streams

Irvine

Brunner

Franssen

et al. 2012

Journal of Hydrology

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KeywordsGroundwater/surface water interaction Streambed heterogeneity Losing streams Disconnection Numerical modeling Inverse modeling s u m m a r y A common approach in modeling surface water-groundwater interaction is to represent the streambed as a homogeneous geological structure with hydraulic properties obtained by means of model calibration. In reality, streambeds are highly heterogeneous, and there are currently no methodical investigations to justify the simplification of this geologic complexity. Using a physically based numerical model, synthetic surface water-groundwater infiltration flux data were generated using heterogeneous streambeds for losing connected, losing transitional and losing disconnected streams. Homogeneous streambed hydraulic conductivities were calibrated to reproduce these fluxes. The homogeneous equivalents were used for predicting infiltration fluxes between streams and the aquifer under different hydrological conditions (i.e. for different states of connection). Homogeneous equivalents are shown to only accurately reproduce infiltration fluxes if both the calibration and prediction are made for a connected flow regime, or if both the calibration and prediction are made for a disconnected flow regime. The greatest errors in flux (±34%) using homogeneous equivalents occurred when there was a mismatch between the flow regime of the observation data and the prediction. These errors are comparatively small when compared with field measurement errors for hydraulic conductivity, however over long river reaches these errors can amount to significant volumes of water.

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Unsaturated hyporheic zone flow in stream/aquifer conjunctive systems

Cited by 68 publications

References 18 publications

Importance of stream infiltration data for modelling surface water–groundwater interactions

Importance of stream infiltration data for modelling surface water–groundwater interactions

Spatial and temporal aspects of the transition from connection to disconnection between rivers, lakes and groundwater

Heterogeneous or homogeneous? Implications of simplifying heterogeneous streambeds in models of losing streams

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