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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

Contribution of a GIS in the spatial modeling of the hydrologic balance of Allondon watershed (France, Switzerland)

Ebener, Steeve ; Wildi, Walter ; Bouzelboudjen, Mahmoud ; Jaquet, J-M ; Fortin, J.-P

In: 3rd International Conference on Future Groundwater Resources At Risk, Lisbon, Portugal, 2001, p. 167-176

This paper discusses the development of an approach allowing the spatial distribution of the hydrologic balance at the watershed scale using Geographical Information Systems (GIS). Methods were developed in order to obtain the intensity distribution of precipitation, interception, infiltration, runoff and evapotranspiration. These methods have been applied on the Allondon watershed (France,...

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

Eléments hydrogéologiques dans l’étude de l’influence de deux décharges sur le système aquifère de la plaine du Rhône (Valais central, Suisse)

Ebener, Steeve ; Bouzelboudjen, Mahmoud ; Wildi, Walter

In: Archives des sciences Genève, 1998, vol. 51, no. 2, p. 153-170

Hydrogeological elements in the study of the influence of two landfills on the Rhône plain aquifer system (central Valais, Switzerland). – The aim of this publication is to contribute to the knowledge of a part of the Rhône plain alluvial system under the influence of two landfills. The hydrological environment of this zone is described using topographic, geologic, climatic and...

Université de Neuchâtel

Variabilité spatio-temporelle des ressources en eau en région semi-aride: application au bassin du Chelif, Algérie

Achour, Farid ; Bouzelboudjen, Mahmoud ; Pieyns, Serge A

In: Water Resources Variability in Africa during the XXth Century, 1998, vol. 252, p. 225-234

Une étude pluviométrique a été réalisée sur une période de 66 ans sur l'ensemble du bassin du Chelif (45 000 km2). Le traitement des données pluviométriques annuelles par l'analyse en composantes principales a permis de mettre en évidence les différentes périodes sèches et humides. Les résultats ont montré aussi la diminution de la pluviométrie d'Est en Ouest. Par...