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Université de Neuchâtel

The effects of geological heterogeneities and piezometric fluctuations on groundwater flow and chemistry in a hard-rock aquifer, southern India

Perrin, J ; Ahmed, S ; Hunkeler, Daniel

In: Hydrogeology Journal, 2011, vol. 19, no. 6, p. 1189-1201

Crystalline aquifers of semi-arid southern India represent a vital water resource for farming communities. A field study is described that characterizes the hydro-dynamic functioning of intensively exploited crystalline aquifers at local scale based on detailed well monitoring during one hydrological year. The main results show large water-table fluctuations caused by monsoon recharge and...

Université de Neuchâtel

Three-dimensional high resolution fluvio-glacial aquifer analog - Part 2: Geostatistical modeling

Comunian, Alessandro ; Straubhaar, Julien ; Renard, Philippe ; Bayer, P.

In: Journal of Hydrology, 2011, vol. 405, no. 1, p. 10

The heterogeneity of sedimentary structures at the decimeter scale is crucial to the understanding of groundwater flow and transport. In a series of two papers, we provide a detailed analysis of a fluvio-glacial aquifer analog: the Herten site. The geological data along a series of 2D sections in a quarry, the corresponding GPR measurements, and their sedimentological interpretation are described...

Université de Neuchâtel

Three-dimensional high resolution fluvio-glacial aquifer analog - Part 1: Field study

Bayer, P. ; Huggenberger, P. ; Renard, Philippe ; Comunian, Alessandro

In: Journal of Hydrology, 2011, vol. 405, no. 1, p. 1

Describing the complex structures that exist in many sedimentary aquifers is crucial for reliable groundwater flow and transport simulation. However, hardly any aquifer can be inspected in such detail that all decimeter to meter heterogeneity is resolved. Aquifer analogs serve as surrogates to construct models of equivalent heterogeneity, and thus imitate those features relevant for flow or...

Université de Neuchâtel

A numerical analysis of dimensionality and heterogeneity effects on advective dispersive seawater intrusion processes

Kerrou, Jaouher ; Renard, Philippe

In: Hydrogeology Journal, 2010, vol. 18, no. 1, p. 55-72

Two-dimensional (2D) and 3D numerical simulations of the dispersive Henry problem show that heterogeneity affects seawater intrusion differently in 2D and 3D. When the variance of a multi-Gaussian isotropic hydraulic conductivity field increases, the penetration of the saltwater wedge decreases in 2D while it increases in 3D. This is due to the combined influence of advective and dispersive...

Université de Neuchâtel

Implications of the spatial variability of infiltration-water chemistry for the investigation of a karst aquifer: a field study at Milandre test site, Swiss Jura

Perrin, J. ; Jeannin, Pierre-Yves ; Zwahlen, François

In: Hydrogeology Journal, 2003, vol. 11, no. 6, p. 673-686

Le site test de Milandre est un aquifère karstique idéal pour étudier lhétérogénéité spatiale des éléments chimiques majeurs car de nombreux points dobservation sont accessibles : source, rivière souterraine et affluents, forages à différentes profondeurs. Les principales causes de la variabilité spatiale des paramètres chimiques sont : nature et localisation des intrants, la...

Université de Neuchâtel

The future of hydraulic tests

Renard, Philippe

In: Hydrogeology Journal, 2005, vol. 13, no. 1, p. 259-262

Université de Neuchâtel

Introducing wwhypda : a world-wide collaborative hydrogeological parameters database

Comunian, Alessandro ; Renard, Philippe

In: Hydrogeology Journal, 2009, vol. 17, no. 2, p. 481-489

Depuis la publication des travaux originaux de Henry Darcy (datés 1880) de très nombreuses valeurs de propriétés physiques des roches (conductivité hydraulique, perméabilité, compressibilité, porosité, etc.) ont été obtenues expérimentalement et publiées. Ces données sont toutefois dispersées et donc difficiles d’accès. Pour palier à ce problème et pour ainsi faciliter la...

Université de Neuchâtel

Deterministic and probabilistic numerical modelling towards sustainable groundwater management : application to seawater intrusion in the Korba aquifer (Tunisia)

Kerrou, Jaouher ; Renard, Philippe (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th. 2053.

This PhD endeavours numerical groundwater modelling considering heterogeneous and uncertain hydraulic parameters. It is made of three parts. First, we investigated the effects of dimensionality and heterogeneity of the hydraulic conductivity on dispersive seawater intrusion (SWI) processes. Multiple 2D and 3D unconditional simulations of hydraulic conductivity fields sharing the same statistics...

Université de Neuchâtel

Flow behavior in a dual fracture network

Jourde, Hervé ; Cornaton, Fabien ; Pistre, Séverin ; Bidaux, Pascal

In: Journal of Hydrology, 2002, vol. 266, no. 1-2, p. 99-119

A model that incorporates a pseudo-random process controlled by mechanical rules of fracturing is used to generate 3D orthogonal joint networks in tabular stratified aquifers. The results presented here assume that two sets of fractures, each with different conductivities, coexist. This is the case in many aquifers or petroleum reservoirs that contain sets of fractures with distinct hydraulic...

Université de Neuchâtel

Bacteriophage transport through a fining-upwards sedimentary sequence : laboratory experiments and simulation

Flynn, Raymond ; Cornaton, Fabien ; Hunkeler, Daniel ; Rossi, Pierre

In: Journal of Contaminant Hydrology, 2004, vol. 74, no. 1-4, p. 231-252

A column containing four concentric layers of progressively finer-grained glass beads (graded column) was used to study the transport of the bacteriophage T7 in water flowing parallel to layering through a fining-upwards (FU) sedimentary structure. By passing a pulse of T7, and a conservative solute tracer upwards through a column packed with a single bead size (uniform column), the capacity of...