groundwater residence times; groundwater sources; data worth; dissolved gas analysis; portable mass spectrometer; integrated surface water-groundwater modelling; model calibration
Parajuli Achut, Nadeau Daniel F., Anctil François, Schilling Oliver S., Jutras Sylvain (2020), Does Data Availability Constrain Temperature-Index Snow Models? A Case Study in a Humid Boreal Forest, in Water
, 12(8), 2284-2284.
Schilling Oliver S., Cook Peter G., Brunner Philip (2019), Beyond classical observations in hydrogeology: The advantages of including exchange flux, temperature, tracer concentration, residence time and soil moisture observations in groundwater model calibration, in Reviews of Geophysics
Tang Qi, Schilling Oliver S., Kurtz Wolfgang, Brunner Philip, Vereecken Harry, Hendricks Franssen Harrie-Jan (2018), Simulating flood induced riverbed transience using unmanned aerial vehicles, physically-based hydrological modelling and the ensemble Kalman filter, in Water Resources Research
, 54(7), 1.
Schilling Oliver S., Park Young-Jin, Therrien René, Nagare Ranjeet M. (2018), Integrated Surface and Subsurface Hydrological Modeling with Snowmelt and Pore Water Freeze-Thaw, in Groundwater
, 57(1), 1-12.
Schomburg A., Schilling O.S., Guenat C., Schirmer M., Le Bayon R.C., Brunner P. (2018), Topsoil structure stability in a restored floodplain: Impacts of fluctuating water levels, soil parameters and ecosystem engineers, in Science of The Total Environment
, 639, 1610-1622.
Schilling Oliver S., Gerber Christoph, Partington Daniel J., Purtschert Roland, Brennwald Matthias S., Kipfer Rolf, Hunkeler Daniel, Brunner Philip (2017), Advancing Physically-Based Flow Simulations of Alluvial Systems Through Atmospheric Noble Gases and the Novel 37Ar Tracer Method, in Water Resources Research
Schilling Oliver S., Irvine Dylan J., Hendricks Franssen Harrie-Jan, Brunner Philip (2017), Estimating the Spatial Extent of Unsaturated Zones in Heterogeneous River-Aquifer Systems, in Water Resources Research
, 53(12), 1.
Surface water-groundwater systems are governed by complex interactions. It is important for us to understand these interactions, as a majority of our drinking water resources come from groundwater pumped in the vicinity of surface water bodies. These drinking water resources are closely linked to the dynamics of the connected surface water bodies, and moreover, with a changing climate the dynamics are changing. To guarantee the safety and sustainability of one of our most important drinking water resources, these complex, connected systems need to be well understood. In order to quantify the exchange fluxes between these two water bodies, observations of many different kinds, as well as integrated hydrological models, are required. More often than not, only one type of observations is available, and the ‘classical’ observations of hydraulic head and surface water discharge are the only basis on which numerical models are calibrated. The information content in these ‘classical’ observations, however, is not sufficient to characterize the exchanged volumes of water, and thus to fully describe the water balance of the surface water-groundwater system. For this, direct observations of exchange fluxes, as well as observations of residence times, mixing processes and groundwater origins, would be required. Current methods to obtain such observations are often expensive, time consuming, not applicable in every system, and require a lot of expertise. A new instrument has the potential to close this gap and revolutionize how we characterize surface water-groundwater systems: A novel portable mass spectrometer for the analysis of dissolved gases directly in the field. With this instrument, one can measure the dissolved gases in groundwater continuously and at high temporal resolution directly in the field (currently around one measurement every 10min). This allows analysing residence times and mixing processes, as well as determining the origins of groundwater, at a never before seen spatial and temporal resolution. In this SNSF early postdoc.mobility fellowship, I would like to develop a method that integrates measurements of dissolved gases into complex, physically-based numerical modelling in order to characterize surface water-groundwater interactions. For this purpose, I plan to visit and work with Prof. René Therrien and his group at Université Laval, who are leading experts in integrated surface water-groundwater systems' modelling. Prof. Therrien is the principal developer of HydroGeoSphere, a ground-breaking modelling code, that finally allowed integrating all the different hydrological processes into one simulator. Observations of residence times and mixing processes made with the portable mass spectrometer in a well-documented, experimental research catchment are going to be used to calibrate a HydroGeoSphere model of the catchment. By comparing the model calibrated with classical observations, against the model calibrated with the classical data plus measurements of dissolved gases, the information content in terms of the potential to reduce the predictive uncertainty of the model, that is, the data worth, of the novel observations is going to be quantified. I desire to develop a new method that uses classical observations in combination with observations obtained with the portable mass spectrometer to calibrate surface water-groundwater models. Ultimately, I plan to publish this method in a peer-reviewed journal. This project would allow me to learn from the leading experts of integrated hydrogeological modelling, and would put myself at the forefront of the evolution of surface water-groundwater science. Furthermore, it would enable me to substantially extend my international network. This early postdoc.mobility fellowship would optimally prepare me with expertise and an international network in order to pursue an academic career in Switzerland.