Université de Neuchâtel

Predicting the spatial correlation of daily streamflows to understand the hydrological response of river networks

Betterle, Andrea ; Schirmer, Mario (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Rivers are fascinating expressions of the hydrological cycle and their waters, riparian areas and floodplains harbor a multitude of ecosystems. The potential for rivers to sustain life depends on the dynamics of water quantity – and quality – that are critically controlled by catchment-scale geomorphoclimatic processes. In particular, the temporal and spatial availability of streamflows is...

Université de Neuchâtel

Geogenic arsenic in groundwater of Burkina Faso

Bretzler, Anja Maria ; Schirmer, Mario (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

In the semi-arid West African Sahel belt, rural populations often rely on groundwater from fractured aquifer systems for their drinking water needs. Recent evidence has shown that some tube wells in northern Burkina Faso are affected by arsenic (As) concentrations above the World Health Organisation’s (WHO) 10 μg/L guideline value. Arsenic is hypothesised to stem from geogenic (naturally...

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

Model complexity and diagnostic-tool based analyses of integrated and physically based models

Ghasemizade, Mehdi ; Schirmer, Mario (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

The proper management of water resources nowadays is a critical issue. In that sense, accurate measurement of water balance components is a prerequisite for the proper management of water resources since one cannot manage what one cannot measure. Due to the difficulty in direct measurements of some of the water balance components such as deep percolation, simulation models are applied. Recent...

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...