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Université de Neuchâtel

Can one identify karst conduit networks geometry and properties from hydraulic and tracer test data?

Borghi, Andrea ; Renard, Philippe ; Cornaton, Fabien

In: Advances in Water Resources, 2016, vol. 90, p. 99-115

Karst aquifers are characterized by extreme heterogeneity due to the presence of karst conduits embedded in a fractured matrix having a much lower hydraulic conductivity. The resulting contrast in the physical properties of the system implies that the system reacts very rapidly to some changes in the boundary conditions and that numerical models are extremely sensitive to small modifications in...

Université de Neuchâtel

Analytical modelling of stable isotope fractionation of volatile organic compounds in the unsaturated zone

Bouchard, Daniel ; Cornaton, Fabien ; Höhener, P ; Hunkeler, Daniel

In: Journal of Contaminant Hydrology, 2011, vol. 119, p. 44-54

Analytical models were developed that simulate stable isotope ratios of volatile organic compounds (VOCs) near a point source contamination in the unsaturated zone. The models describe diffusive transport of VOCs, biodegradation and source ageing. The mass transport is governed by Fick's law for diffusion. The equation for reactive transport of VOCs in the soil gas phase was solved for different...

Université de Neuchâtel

Stochastic forecasts of seawater intrusion towards sustainable groundwater management : application to the Korba aquifer (Tunisia)

Kerrou, Jaouher ; Renard, Philippe ; Cornaton, Fabien ; Perrochet, Pierre

In: Hydrogeology Journal, 2013, vol. 21, no. 2, p. 425-440

A stochastic study of long-term forecasts of seawater intrusion with an application to the Korba aquifer (Tunisia) is presented. Firstly, a geostatistical model of the exploitation rates was constructed, based on a multi-linear regression model combining incomplete direct data and exhaustive secondary information. Then, a new method was designed and used to construct a geostatistical model of the...

Université de Neuchâtel

Tracer and timescale methods for understanding complex geophysical and environmental fluid flows

Deleersnijder, Eric ; Cornaton, Fabien ; Haine, Thomas W.N. ; Vanclooster, Marnik ; Waugh, Darryn W

In: Environmental Fluid Mechanics, 2010, vol. 10, no. 1-2, p. 1-5

Understanding advective-diffusive transport of trace constituents in natural fluid flows is an important challenge in Earth and environmental sciences with many diverse applications, including simulating the fate of contaminants, inferring the location of their source, and model assessment (e.g., [7,21]). Eulerian and Lagrangian methods are routinely used, including novel representations of...

Université de Neuchâtel

A method for the stochastic modeling of karstic systems accounting for geophysical data : an example of application in the region of Tulum, Yucatan Peninsula (Mexico)

Vuilleumier, Cécile ; Borghi, Andrea ; Renard, Philippe ; Ottowitz, David ; Schiller, A. ; Supper, Robert ; Cornaton, Fabien

In: Hydrogeology Journal, 2013, vol. 21, no. 9, p. 523-544

The eastern coast of the Yucatan Peninsula, Mexico, contains one of the most developed karst systems in the world. This natural wonder is undergoing increasing pollution threat due to rapid economic development in the region of Tulum, together with a lack of wastewater treatment facilities. A preliminary numerical model has been developed to assess the vulnerability of the resource. Maps of...

Université de Neuchâtel

The influence of paleoclimatic events on the functioning of an alpine thermal system (France): the contribution of hydrodynamic–thermal modeling

Gallino, Stéphanie ; Josnin, Jean-Yves ; Dzikowski, Marc ; Cornaton, Fabien ; Gasquet, Dominique

In: Hydrogeology Journal, 2009, vol. 17, no. 8, p. 1887-1900

Numerical models of the Aix-les-Bains thermal aquifer (France) were used to investigate the influence of Quaternary paleoclimatic events on the current thermal state of the groundwater. Initial numerical tests were successful in that present-day fluid flows (heads and flow rates) and the resulting velocities were compatible with residence time data. Water flowing through an aquifer cools the rock...

Université de Neuchâtel

Truncated Plurigaussian Simulations to Characterize Aquifer Heterogeneity

Mariethoz, Grégoire ; Renard, Philippe ; Cornaton, Fabien ; Jacquet, Olivier

In: Ground Water, 2009, vol. 47, no. 1, p. 13-24

Integrating geological concepts, such as relative positions and proportions of the different lithofacies, is of highest importance in order to render realistic geological patterns. The truncated plurigaussian simulation method provides a way of using both local and conceptual geological information to infer the distributions of the facies and then those of hydraulic parameters. The method (Le...

Université de Neuchâtel

The role of tributary mixing in chemical variations at a karst spring, Milandre, Switzerland

Perrin, J. ; Jeannin, Pierre-Yves ; Cornaton, Fabien

In: Journal of Hydrology, 2007, vol. 332, no. 1-2, p. 158-173

Solute concentration variations during flood events were investigated in a karst aquifer of the Swiss Jura. Observations were made at the spring, and at the three main subterraneous tributaries feeding the spring. A simple transient flow and transport numerical model was able to reproduce chemographs and hydrographs observed at the spring, as a result of a mixing of the concentration and...

Université de Neuchâtel

Reply to “Comment on groundwater age, life expectancy and transit time distributions in advective–dispersive systems : 1. Generalized reservoir theory” by Timothy R. Ginn

Cornaton, Fabien ; Perrochet, Pierre

In: Advances in Water Resources, 2007, vol. 30, no. 4, p. 1058-1059

We thank T.R. Ginn for his interest in our recently published article (1) on the subject of groundwater age modelling and reservoir theory. In his previous comment (2), T.R. Ginn expresses concern about some conceptual inconsistencies in the formulations presented in our work. We basically agree with the fundaments of his comments, and we wish to continue the discussion. (1) F. Cornaton and P....