Université de Neuchâtel

Groundwater recharge dynamics by snowmelt

Meeks, Jessica ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Understanding the recharge mechanisms for karst aquifers is of great importance because these aquifers are relied upon by a quarter of Earth’s population, and because their recharge and discharge dynamics are often strongly coupled. Given this coupling, karst groundwater resources are inherently susceptible to surface processes such as climate, where the timing and volume of water infiltration...

Université de Neuchâtel

Hydraulics and sedimentary processes in the karst aquifer of Milandre (Jura Mountains, Switzerland)

Vuilleumier, Cécile ; Jeannin, Pierre-Yves (Dir.) ; Perrochet, Pierre (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

This thesis aims at characterizing the sedimentary processes taking place in the karst aquifer of Milandre (Switzerland) both by direct observation inside the conduit network and through numerical modeling. A physics based pipe flow model of the downstream part of the karst system is developed on the basis of measurements of hydraulic heads, flow rates and flow velocities performed in the...

Université de Neuchâtel

Process based modeling of the karstification processes in the region of Tulum, Mexico

Maqueda, Axayacatl ; Renard, Philippe (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Caves are important since they are preferential paths for groundwater flow. Knowledge of caves or karst is essential for proper management of water resources, but the exploration of caves is a major challenge. An alternative to study caves and their structure is to simulate the processes related to cave growth. The motivation of this thesis is to study large karst networks in the region of...

Université de Neuchâtel

Use of natural and artificial reactive tracers to investigate the transfer of solutes in karst systems

Savoy, Ludovic ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1985.

Numerous studies in unconsolidated aquifers have shown that natural attenuation, mainly due to biodegradation, can substantially reduce the contaminant mass in an aquifer. Much less is known about the relevance of natural attenuation in karst aquifers. This project investigated the potential for attenuation of dissolved compounds by biodegradation in the karst unsaturated zone. To what extent...

Université de Neuchâtel

Interprétation des réponses hydrauliques et chimiques des sources karstiques : (essai d'inférence de la structure des systèmes karstiques)

Grasso, Domenico Alessandro ; Zwahlen, François (Dir.)

Thèse de doctorat : Université de Neuchâtel, 1999 ; 1445.

Les aquifères karstiques sont des systèmes très complexes, l'hétérogénéité spatiale de leurs paramètres hydrauliques (perméabilités, potentiels hydrauliques, coefficients d'emmagasinement) en rend l'étude difficile. Les caractéristiques structurales et hydrodynamiques des aquifères karstiques sont principalement étudiées par l'intermédiaire de l'analyse des réponses globales...

Université de Neuchâtel

A conceptual model of flow and transport in a karst aquifer based on spatial and temporal variations of natural tracers

Perrin, Jérôme ; Zwahlen, François (Dir.) ; Jeannin, Pierre-Yves (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1699.

Karst aquifers represent an important groundwater resource world-wide. They are highly vulnerable to contamination due to fast transport through the system and limited attenuation of contaminants. The two main hydrogeological approaches developed for studying flow and transport are: inference of the system structure from karst spring hydrographs and chemographs; numerical modelling of flow and...

Université de Neuchâtel

Geometry and hydraulic parameters of karst aquifers : a hydrodynamic modeling approach

Kovács, Attila ; Perrochet, Pierre (Dir.) ; Jeannin, Pierre-Yves (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1724.

This thesis presents a method for characterizing flow systems in karst aquifers by acquiring quantitative information about the geometric and hydraulic parameters of a karst conduit network from spring hydrograph analysis. The investigation method applied consisted of constructing simple conceptual models of karst systems, and deducing analytical formulae describing the connection between aquifer...