Refine my results

Document type

  • Theses disable the filter

Specific Collection

Language

Université de Neuchâtel

Application of carbon-chlorine isotopic analysis to determine the origin and fate of chlorinated ethenes in groundwater

Badin, Alice ; Hunkeler, Daniel (Dir.) ; Schirmer, Mario (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Chlorinated ethenes are ubiquitous groundwater contaminants posing a threat to one of our main drinking water sources. Despite their spill history dating back to more than 40 years ago, these contaminants are still found in groundwater in numerous industrially developed countries due to their persistence, difficult characterisation in the subsurface and resulting challenging remediation. When...

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.

Drinking water derived by riverbank filtration is generally of high quality and is an important source of drinking water in several European countries. In the future however, riverbank-filtration systems will face two major challenges – river restoration and climate change. The goal of this Ph.D. Thesis was to deepen the understanding of physical and biogeochemical processes that occur during...

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.

Urban areas can affect groundwater quality by releasing wastewater-borne contaminants including inorganic compounds and micropollutants. Sewer networks and urban streams that receive effluent from wastewater treatment plants, for example, act as wastewater transport pathways, while potentially losing treated or untreated wastewater to groundwater. Collectively, these pathways are known as urban...

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.

Currently half of the world’s population resides in cities. The ongoing urban land consumption has a tremendous impact on the entire water balance of urban areas. Apart from water quantity, the water quality has also strongly deteriorated. In particular, micropollutants from domestic and industrial wastewater are of growing concern. Despite their low concentrations, micropollutants can act as...