Different vegetation types have distinct root and canopy properties which are directly linked to soil hydrological processes. Considering these vegetation-specific properties in soil hydrological models may improve the prediction of soil water and soil solute dynamics. Such considerations will provide a better quantification of the soil water balance and potential groundwater pollution caused by solute leaching.

The main research objective consists of evaluating vegetation-specific representation.

Simulations with the process-based soil hydrological model RoGeR and comparison to measured lysimeter data.

Robin Schwemmle, Markus Weiler

RoGeR is available at https://roger.readthedocs.io/en/latest/.

Since several lysimeter data sets are available. several theses are possible for the sites listed in the following:

- Wuestebach, Germany (grassland; stable water isotopes; more information is available at Groh et al., 2018)

- Lausanne, Switzerland (willow tree; stable water isotopes and fluorobenzoate tracers; more information is available at Nehemy et al., 2021 and Queloz et al., 2015)

- Raumberg-Gumpenstein, Austria (crops and grassland; nitrate; more information is available at Eder et al., 2015 and Herndl et al., 2013)

- Sankt Arnold, Germany (different tree-species; virtual tracer; more information is available at https://www.lanuv.nrw.de/umwelt/wasser/lysimeter/literatur-und-dokumente).

Robin Schwemmle robin.schwemmle@hydrology.uni-freiburg.de

advanced programming skills, knowledge in the programming language Python

English (or German)

Eder, A., Blöschl, G., Feichtinger, F., Herndl, M., Klammler, G., Hösch, J., Erhart, E., and Strauss, P.: Indirect nitrogen losses of managed soils contributing to greenhouse emissions of agricultural areas in Austria: results from lysimeter studies, Nutrient Cycling in Agroecosystems, 101, 351-364, https://www.doi.org/10.1007/s10705-015-9682-9, 2015.

Groh, J., Stumpp, C., Lücke, A., Pütz, T., Vanderborght, J., and Vereecken, H.: Inverse Estimation of Soil Hydraulic and Transport Parameters of Layered Soils from Water Stable Isotope and Lysimeter Data, Vadose Zone Journal, 17, https://doi.org/10.2136/vzj2017.09.0168, 2018.

Herndl, M., Schink, M., Kandolf, M., Bohner, A., and Buchgraber, K.: Nährstoffauswaschung im Grünland in Abhängigkeit vom Wirtschaftsdüngungs- und Nutzungssystem, 15. Gumpensteiner Lysimetertagung 2013, Raumberg-Gumpenstein, Austria, 25 - 30, 2013.

Nehemy, M. F., Benettin, P., Asadollahi, M., Pratt, D., Rinaldo, A., and McDonnell, J. J.: Tree water deficit and dynamic source water partitioning, Hydrological Processes, 35, e14004, https://doi.org/10.1002/hyp.14004, 2021.

Queloz, P., Bertuzzo, E., Carraro, L., Botter, G., Miglietta, F., Rao, P. S. C., and Rinaldo, A.: Transport of fluorobenzoate tracers in a vegetated hydrologic control volume: 1. Experimental results, Water Resources Research, 51, 2773-2792, https://www.doi.org/10.1002/2014wr016433, 2015.

Schwemmle, R., and Weiler, M.: Consistent modelling of transport processes and travel times - coupling soil hydrologic processes with StorAge Selection functions (in review), submitted to Water Resources Research, https://doi.org/10.22541/essoar.167751575.55537069/v1, 2023.

Steinbrich, A., Leistert, H., and Weiler, M.: Model-based quantification of runoff generation processes at high spatial and temporal resolution, Environmental Earth Sciences, 75, 1423, https://doi.org/10.1007/s12665-016-6234-9, 2016.