1. Department of Geoscience, Aarhus University, Aarhus, Denmark
2. Department of Geoscience and the Aarhus University Center for Water Technology, Aarhus University, Aarhus, Denmark
3. Department of Electrical and Computer Engineering, Aarhus University, Aarhus, Denmark
4. Department of Electrical and Computer Engineering and the Aarhus University Center for Water Technology, Aarhus University, Aarhus, Denmark