Université de Neuchâtel

Hydrogeological and topographical controls on catchment dynamics and their implications for low flows

Carlier, Claire ; Brunner, Philip (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Periods with scarce precipitation will likely occur more frequently and last longer under changing climatic conditions, even in relatively humid regions like Switzerland. To assess the sensitivity of water resources to dry spells and to identify regions that might experience water scarcity issues, a thorough understanding of the mechanisms governing catchment dynamics in the absence of rain is...

Université de Neuchâtel

Advances in characterizing surface water-groundwater interactions : combining unconventional data with complex, fully-integrated models

Schilling, Oliver S. ; Brunner, Philip (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

The characterization and simulation of the interactions between surface water and groundwater require observations of hydrological state variables and flow processes. While the latest generation of physically-based flow models allows the integrated simulation of all relevant hydrological processes, the current modelling practice is not adequate to provide reliable predictions. Numerous studies...

Université de Neuchâtel

The role of flow regimes for sediment transport and flooding potential of river catchments

Basso, Stefano ; Schirmer, Mario (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

The river flow regime is the main driver of several processes occurring in riverine environments, which are relevant for the sustainable management of water resources. It also determines the sensitivity of the flow distribution itself to a changing climate, and possibly affects catchments' behaviors with respect to extreme flows. For this reason, understanding links among hydrologic and...

Université de Neuchâtel

Analytical modeling of reach-scale and network-scale dynamics of flow regimes

Doulatyari, Behnam ; Schirmer, Mario (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Sustainable management of river networks is an important topic in hydrology today. Rivers and streams are a significant source of drinking water, as well as energy production and other human valued services. Spatial and temporal patterns of flow regimes have a significant impact on ecological and anthropogenic uses of fresh water within entire river basins. Developing tools for management of...

Université de Neuchâtel

Investigation of groundwater-surface water interactions with distributed temperature sensing (DTS)

Kurth, Anne-Marie ; Schirmer, Mario (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2014.

Groundwater-surface water interactions are a vital necessity for aquatic ecosystems as they control the water temperature, the availability of nutrients, dissolved oxygen and the water quality in the hyporheic zone. A lack of groundwater-surface water interactions may result in the deterioration of ecosystem health and functioning. Studies between 1997 and 2008 have shown that 22 % of Swiss water...

Université de Neuchâtel

Effect of river restoration and hydrological changes on surface water quality : river reach-scale to catchment-scale study

Chittoor Viswanathan, Vidhya ; Schirmer, Mario (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

River restoration is considered as an alternative flood protection measure, to restore the native habitat in the rivers and to improve water quality. Often the restoration projects aim to achieve more than one of the objectives mentioned above as the goals are often interlinked. The effect of river restoration on water quality is seldom studied. The analysis of case studies of restoration...

Université de Neuchâtel

Groundwater dynamics and streamflow generation in a mountainous headwater catchment : process understanding from field experiments and modeling studies

Freyberg, Jana von ; Schirmer, Mario (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Groundwater systems in mountainous headwater catchments significantly sustain downstream freshwater bodies and therefore play an important role in the regional water cycle. Complex interactions between atmospheric, subsurface and ecological variables occur that determine groundwater quantity and quality as well as streamflow-generation mechanisms at different spatiotemporal scales. An integrated...

Université de Neuchâtel

Virus transport and attenuation in Perialpine Gravel Aquifers

Flynn, Raymond Matthew ; Zwahlen, François (Dir.) ; Hunkeler, Daniel (Codir.)

Thèse de doctorat : Université de Neuchâtel : 2003 ; 1720.

Pollution of groundwater by microbiological contaminants (bacteria, viruses and protozoa) is a widespread problem in the United States and Europe. Gravel aquifers, which form an important drinking water resource in many parts of Central Europe, may be highly vulnerable to this type of contamination. Due to the smaller size and perceived greater mobility, studies of microbiological contaminant...