Université de Neuchâtel

3-D groundwater modeling at regional scale

Kimmeier, Francesco ; Bouzelboudjen, Mahmoud ; Király, László

Large hydrogeological basins are constituted of several superimposed aquifers, separated by geological formations of relatively low permeabilities. The delimitation of the different flow systems is far more difficult to realize for a heterogeneous system. Flux vectors provide valuable indications about groundwater flow paths and hydraulic exchanges between the different geological formations....

Université de Neuchâtel

TracES/View - Traçage des Eaux Souterraines : Application SIG en milieu karstique jurassien (Suisse)

Bouzelboudjen, Mahmoud ; Ornstein, Pascal ; Kimmeier, Francesco

In: 7ème Colloque d'Hydrologie en Pays Calcaire et en Milieu Fissuré, 2001, p. 59-65

The use of artificial tracers is a specially well-established method to investigate karstic aquifers. In this case, tracing (artificial and biological tracers) enables to delimit watercatchment boundaries, to identify relation between a sinkhole and an outlet, to assess diffluent phenomena, transit time, etc. More recently tracer methods have been used in pollution transport studies. Tracer...

Université de Neuchâtel

Geohydrological parameters identification and groundwater vulnerability to pollution: A Swiss case study

Kimmeier, Francesco ; Bouzelboudjen, Mahmoud ; Ornstein, Pascal ; Weber, Isabelle ; Rouiller, Jean-Daniel

In: 3rd International Conference on Future Groundwater Resources at Risk, Lisbon, Portugal, 2001, p. 63-78

The alluvial aquifer of the Rhône valley in Switzerland, which extends over 110 km and occupies an area of 256 km2, is of great economic importance. Its groundwaters are easily accessible and thus exploitable at low cost. However, its location in an often narrow valley with intense human activity (industry, agriculture, communications network) makes it particularly vulnerable from...

Université de Neuchâtel

A statistical time series analysis of hydro-climatic stress on karst aquifer system (Switzerland)

Kimmeier, Francesco ; Bouzelboudjen, Mahmoud ; Eisenlohr, Laurent ; Rossier, Yvan ; Zwahlen, François

In: 3rd International Conference on Future Groundwater Resources At Risk, Lisbon, Portugal, 2001, p. 659-671

In order to determine the impact of climatic variations on several spring discharge, five karst aquifer systems were chosen in the Neuchâtel Jura (three basins over an area of 359 km2) and in the Prealps (2 basins of 4 and 10 km2 respectively). The records of air temperature, precipitation and groundwater discharge vary between 13 and 91 years. Statistical trend analyses...

Université de Neuchâtel

Drought risk analysis applied to porous Swiss aquifers

Kimmeier, Francesco ; Bouzelboudjen, Mahmoud ; Eisenlohr, Laurent ; Rossier, Yvan

In: 3rd International Conference on Future Groundwater Resources At Risk, Lisbon, Portugal, 2001, p. 51-61

The impact of hydrogeological drought on groundwater has been studied in the context of natural flow systems. The aim of this article is to find the relative resistance of 18 unconfined aquifer systems in porous media to a prolonged shortfall in recharge. A synthetic relative drought resistance indicator has been calculated for each of the aquifer systems based on 4 variables which are the...

Université de Neuchâtel

Travel path uncertainty: a case study combining stochastic and deterministic hydrodynamic models in the Rhône valley, Switzerland

Kimmeier, Francesco ; Bouzelboudjen, Mahmoud ; Ababou, Rachid ; Ribeiro, Luis

In: 3rd International Conference on Future Groundwater Resources At Risk, Lisbon, Portugal, 2001, p. 195-208

In the framework of waste storage in geological formations at shallow or greater depths and accidental pollution, the numerical simulation of groundwater flow and contaminant transport represents an important instrument to predict and quantify the pollution as a function of time and space. The numerical simulation problem, and the required hydrogeologic data, are often approached in a...

Université de Neuchâtel

GIS Vector and Raster Database, Advanced Geostatistics and 3-D Groundwater Flow Modelling in Strongly Heterogeneous Geologic Media: An Integrated Approach

Bouzelboudjen, Mahmoud ; Kimmeier, Francesco

In: The Eighteenth Annual Esri User Conference, 1998, p. 1-5

The aquifers of the Rhône valley in Switzerland are of great economic importance. The groundwaters are exploitable at slight costs. However, their situation make them specially vulnerable. The aim of this paper is to give a brief outlook on the methodology to build a very powerful three dimensional hydrogeological model. This model will be used by the community of Valais as a tool for the...