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Université de Neuchâtel

Riverbank filtration within the context of river restoration and climate change

Diem, Samuel ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

L’eau de consommation provenant de la filtration sur berge est généralement de bonne qualité et constitue une source d’eau potable dans plusieurs pays de l’Union Européenne. A l’avenir pourtant, la filtration sur berge devra faire face à deux défis majeurs: les programmes de restauration de rivière et les changements climatiques. La présente thèse vise, d’une part, à...

Université de Neuchâtel

Evaluating the effect of climate change on groundwater resources : from local to catchment scale

Möck, Christian ; Hunkeler, Daniel (Dir.) ; Brunner, Philip (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

There is strong evidence that climate is changing and will affect the water resources. A major question arising from the evaluation of climate change (CC) impacts on groundwater resources is to what extent groundwater recharge will change. Given that for Switzerland, climate models predict more frequent hot and dry summers in the future while precipitation will tend to increase in winter, a...

Université de Neuchâtel

Laboratory and numerical study of hyporheic flow in karst conduits and its effect on sediment-entrapped DNAPLs

Wu, Yuexia ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

Contamination of karst aquifer, particularly by organic compounds, such as the Dense Non-aqueous Phase Liquids (DNAPLs) constitutes a threat for water supply and the environment. Due to the presence of large openings in karst systems and the high density of DNAPLs they may frequently reach conduits and accumulate at low points such as siphon structures that likely also contain sediments. Hence...

Université de Neuchâtel

Isotope fractionation of volatile organic compounds in porous media under variably saturated conditions

Jeannottat, Simon ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Compound-specific isotope analysis (CSIA) has proven to be an effective tool to assess in-situ biodegradation of volatile organic compounds (VOCs) in groundwater and to distinguish between different contaminant sources. There is an increasing interest to apply the CSIA method also in unsaturated zone studies. However, under variably saturated conditions, physical processes such as phase...

Université de Neuchâtel

Investigating the origin of chloroform in soils and groundwater using carbon and chlorine stable isotopes analysis

Breider, Florian ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

Chloroform (CHCl3) has been considered for a long time as an anthropogenic contaminant which is known to be possibly carcinogenic to humans. Chloroform is also an important contributor to gaseous chlorine in the atmosphere and may catalyze some chemical reactions in the lower atmosphere. The presence of chloroform in aquatic and terrestrial environments has been widely demonstrated....

Université de Neuchâtel

Development of a system for "in situ" determination of chlorinated hydrocarbons in groundwater

Boutsiadou, Xanthippe ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Volatile organic compounds (VOCs), and especially chlorinated hydrocarbons, are common groundwater contaminants. Efficient monitoring that can be conducted directly in the field is needed to detect a possible pollution by organic contaminants such as chlorinated hydrocarbons. The general aim of this project is to develop a portable instrument for the in situ measurement of chlorinated...

Université de Neuchâtel

Prediction of groundwater quality using transfer functions - an approach to link historical data to future concentrations

Baillieux, Antoine ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

Groundwater quality has been degraded by anthropogenic activities at many locations. In order to reverse upward concentration trends, environmental programs such as land use changes are frequently implemented. To evaluate the efficiency of such measures, methods linking the evolution of the groundwater quality at public-supply wells to the history of pollutant inputs in their capture zones are...

Université de Neuchâtel

Groundwater contamination from urban line sources : monitoring and evaluation approach with integral pumping tests

Leschik, Sebastian ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.) ; Liedl, Rudolf (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

Les zones urbaines peuvent affecter la qualité des eaux souterraines en libérant des contaminants transportés par les eaux usées, incluant des composés inorganiques et des micropolluants. Les réseaux d’égouts et les cours d’eau urbains qui reçoivent par exemple les effluents des stations d’épuration, se comportent comme des chemins de transport d’eaux usées, qui potentiellement...

Université de Neuchâtel

Micropollutants in urban receiving waters

Musolff, Andreas ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2139.

À ce jour, la moitié de la population mondiale vit à l’intérieur des villes. Cette utilisation du territoire a un énorme impact sur le bilan hydrique urbain. Non seulement la quantité de l’eau est désormais limitée mais sa qualité s’est également détériorée. Les micropolluants provenant des eaux usées domestiques et industrielles représentent une préoccupation grandissante....

Université de Neuchâtel

Assessment of in situ biodegradation of chlorinated solvents in aquifers and constructed wetlands using an integrative approach

Imfeld, Gwenaël ; Hunkeler, Daniel (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2008 ; Th.2069.

Knowledge about biogeochemical processes associated with natural attenuation of chlorinated solvents in the environment is currently limited. Though processes such as sorption, volatilization or dilution may contribute to contaminant natural attenuation, in situ biodegradation is the only process leading to destructive removal of contaminants. However, the distribution of hydrological and...