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Université de Neuchâtel

Coupling X-ray computed tomography and freeze-coring for the analysis of fine-grained low-cohesive soils

Liernur, Adrien ; Schomburg, Andreas ; Turberg, Pascal ; Guenat, Claire ; Le Bayon, Renée-Claire ; Brunner, Philip

In: Geoderma, 2017, vol. 308, p. 171-186

This paper presents the coupling of freeze-core sampling with X-ray CT scanning for the analysis of the soil structure of fine-grained, low-cohesive soils. We used a medical scanner to image the 3D soil structure of the frozen soil cores, providing X-ray CT data at a millimetric resolution over freeze-cores that are up to 62.5 cm long and 25 cm wide. The obtained data and the changes in gray...

Accès public à partir du 1 nov. 2018
Université de Neuchâtel

Rock-Eval pyrolysis discriminates soil macro-aggregates formed by plants and earthworms

Schomburg, Andreas ; Verrecchia, Eric P ; Guenat, Claire ; Brunner, Philip ; Sebag, David ; Le Bayon, Renée Claire

In: Soil Biology & Biochemistry, 2018, vol. 117, p. 117-124

Plants and earthworms, as soil ecosystem engineers, play a crucial role during stabilisation of organic matter in soil through its incorporation into soil aggregates. It is therefore essential to better understand the mechanisms and interactions of soil engineering organisms regarding soil organic matter stabilisation. Several methods have already been successfully applied to differentiate soil...

Université de Neuchâtel

Advances in understanding river-groundwater interactions

Brunner, Philip ; Therrien, R ; Renard, Philippe ; Simmons, C.T ; Hendricks Franssen, H-J

In: Reviews of Geophysics, 2017, vol. 55, p. 818-854

River-groundwater interactions are at the core of a wide range of major contemporary challenges, including the provision of high-quality drinking water in sufficient quantities, the loss of biodiversity in river ecosystems, or the management of environmental flow regimes. This paper reviews state of the art approaches in characterizing and modeling river and groundwater interactions. Our review...

Université de Neuchâtel

Infiltration under snow cover : Modeling approaches and predictive uncertainty

Meeks, Jessica ; Moeck, Christian ; Brunner, Philip ; Hunkeler, Daniel

In: Journal of Hydrology, 2017, vol. 546, p. 16-27

Groundwater recharge from snowmelt represents a temporal redistribution of precipitation. This is extremely important because the rate and timing of snowpack drainage has substantial consequences to aquifer recharge patterns, which in turn affect groundwater availability throughout the rest of the year. The modeling methods developed to estimate drainage from a snowpack, which typically rely on...

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...