1. Wageningen University - Soil Physics, Ecohydrology and Groundwater Management Group; P.O. Box 47; Wageningen; 6700 AA; Netherlands
2. Trier University - Physical Geography; Behringstraße / Campus II; Trier; 54296; Germany
3. Norwegian University of Life Sciences - Mathematical Sciences and Technology; Box 5003; Ås; 1432; Norway