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Université de Neuchâtel

The influence of model structure on groundwater recharge rates in climate-change impact studies

Moeck, Christian ; Brunner, Philip ; Hunkeler, Daniel

In: Hydrogeology journal, 2016, vol. 24, p. 1171-1184

Numerous modeling approaches are available to provide insight into the relationship between climate change and groundwater recharge. However, several aspects of how hydrological model choice and structure affect recharge predictions have not been fully explored, unlike the well-established variability of climate model chains—combination of global climate models (GCM) and regional climate models...

Université de Neuchâtel

Evaluation of outputs from automated baseflow separation methods against simulated baseflow from a physically based, surface water-groundwater flow model

Partington, D ; Brunner, Philip ; Simmons, C. T ; Werner, A. D ; Therrien, R ; Maier, H. R ; Dandy, G. C

In: Journal of Hydrology, 2012, vol. 458–459, p. 28-39

Summary Baseflow is often considered to be the groundwater discharge component of streamflow. It is commonly estimated using conceptual models, recursive filters or a combination of the two. However, it is difficult to validate these methods due to the current challenges of measuring baseflow in the field. In this study, simulation of a synthetic catchment’s response to rainfall is carried...

Université de Neuchâtel

Aquifer response to surface water transience in disconnected streams

Shanafield, Margaret ; Cook, Peter G ; Brunner, Philip ; McCallum, James ; Simmons, Craig T

In: Water Resources Research, 2012, vol. 48, no. 11, p. W11510

Existing analytical solutions to determine aquifer response to a change in stream stage are inappropriate where an unsaturated zone exists beneath the stream, as in the case of disconnected stream-aquifer systems. A better understanding of the relationship between aquifer response and transient stream stage in disconnected systems is therefore required, as this would also aid in the field...

Université de Neuchâtel

Uncertainty assessment and implications for data acquisition in support of integrated hydrologic models

Brunner, Philip ; Doherty, J ; Simmons, Craig T

In: Water Resources Research, 2012, vol. 48, no. 7, p. W07513

The data set used for calibration of regional numerical models which simulate groundwater flow and vadose zone processes is often dominated by head observations. It is to be expected therefore, that parameters describing vadose zone processes are poorly constrained. A number of studies on small spatial scales explored how additional data types used in calibration constrain vadose zone ...

Université de Neuchâtel

Interpreting streamflow generation mechanisms from integrated surface-subsurface flow models of a riparian wetland and catchment

Partington, D ; Brunner, Philip ; Frei, S ; Simmons, C. T ; Werner, A. D ; Therrien, R ; Maier, H. R. ; Dandy, G. C ; Fleckenstein, J. H

In: Water Resources Research, 2013, vol. 49, no. 9, p. 5501-5519

The understanding of streamflow generation processes is vitally important in the management of water resources. In the absence of the data required to achieve this, Integrated Surface-Subsurface Hydrological Models (ISSHM) can be used to assist with the development of this understanding. However, the standard outputs from these models only enable elicitation of information about hydrological...

Université de Neuchâtel

Is high-resolution inverse characterization of heterogeneous river bed hydraulic conductivities needed and possible?

Kurtz, W ; Hendricks Franssen, H. J ; Brunner, Philip ; Vereecken, H

In: Hydrology & Earth System Sciences, 2013, vol. 17, no. 10, p. 3795-3813

River–aquifer exchange fluxes influence local and regional water balances and affect groundwater and river water quality and quantity. Unfortunately, river–aquifer exchange fluxes tend to be strongly spatially variable, and it is an open research question to which degree river bed heterogeneity has to be represented in a model in order to achieve reliable estimates of river–aquifer...

Université de Neuchâtel

Channel Representation in Physically Based Models Coupling Groundwater and Surface Water: Pitfalls and How to Avoid Them

Käser, Daniel ; Graf, Tobias ; Cochand, Fabien ; McLaren, Rob ; Therrien, René ; Brunner, Philip

In: Groundwater, 2014, vol. 52, no. 6, p. 827-836

Recent models that couple three-dimensional subsurface flow with two-dimensional overland flow are valuable tools for quantifying complex groundwater/stream interactions and for evaluating their influence on watershed processes. For the modeler who is used to defining streams as a boundary condition, the representation of channels in integrated models raises a number of conceptual and...

Université de Neuchâtel

When Can Inverted Water Tables Occur Beneath Streams?

Xie, Yueqing ; Cook, Peter G ; Brunner, Philip ; Irvine, Dylan J ; Simmons, Craig T

In: Groundwater, 2014, vol. 52, no. 5, p. 769-774

Decline in regional water tables (RWT) can cause losing streams to disconnect from underlying aquifers. When this occurs, an inverted water table (IWT) will develop beneath the stream, and an unsaturated zone will be present between the IWT and the RWT. The IWT marks the base of the saturated zone beneath the stream. Although a few prior studies have suggested the likelihood of an IWT without...

Université de Neuchâtel

Using tree ring data as a proxy for transpiration to reduce predictive uncertainty of a model simulating groundwater–surface water–vegetation interactions

Schilling, O. S ; Doherty, J ; Kinzelbach, W ; Wang, H ; Yang, P. N ; Brunner, Philip

In: Journal of Hydrology, 2014, vol. 519, p. 2258-2271

Summary The interactions between surface water, the vadose zone, groundwater, and vegetation are governed by complex feedback mechanisms. Numerical models simulating these interactions are essential in quantifying these processes. However, the notorious lack of field observations results in highly uncertain parameterizations. We suggest a new type of observation data to be included in the...

Université de Neuchâtel

Groundwater fluxes in a shallow seasonal wetland pond: The effect of bathymetric uncertainty on predicted water and solute balances

Trigg, Mark A ; Cook, Peter G ; Brunner, Philip

In: Journal of Hydrology, 2014, vol. 517, no. 517, p. 901-912

Summary The successful management of groundwater dependent shallow seasonal wetlands requires a sound understanding of groundwater fluxes. However, such fluxes are hard to quantify. Water volume and solute mass balance models can be used in order to derive an estimate of groundwater fluxes within such systems. This approach is particularly attractive, as it can be undertaken using measurable...