Stefan Kollet

Agrosphere Institute, Jülich, Germany

Stefan Kollet earned his PhD in Geosciences at Nebraska University, Lincoln, USA in 2003. Currently, he is the group leader for Integrated Terrestrial Modeling at the Agrosphere Institute at the Research Centre Juelich and Professor at the Meteorological Institute, Bonn University, Germany. S. Kollet is also the Scientific Director of Center for High-Performance Scientific Computing in Terrestrial Systems of the Geoverbund ABC/J. His research interests encompass interactions of the terrestrial water and energy cycle, watershed hydrodynamics, subsurface flow and transport, and high-performance computing (HPC) in the geosciences.

Groundwater-to-atmosphere simulations under human water use conditions over the European continent

Groundwater-to-atmosphere simulations are useful for closing the terrestrial water and cycle at the continental scale and interrogating anthropogenic impacts at different space and time scales.  We want to understand how human water use, in this case groundwater pumping and irrigation, changes the natural terrestrial cycles over the  European continent including local effects, such as changes in water table depths, evapotranspiration, and air temperature, and non-local effects, such as base flow, continental discharge and precipitation. In particular, we study whether these changes are systematic in space and time, and ultimately impact and potentially redistribute water resources across the continent. We present technical aspects of our work related to model coupling and high-performance computing technologies, and results illustrating the significant impact of human water use beyond individual watersheds..

Figure. Snapshot of groundwater-to-atmosphere simulation results: groundwater, soil moisture and liquid cloud water content over the European continent.

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