Dr. rer. nat.  Ralf Loritz

Dr. rer. nat. Ralf Loritz

  • Karlsruher Institut für Technologie (KIT)
    Institut für Wasser und Umwelt
    Bereich Hydrologie
    Kaiserstraße 12
    76131 Karlsruhe


  • Enviromental modeling (physically-based and data-driven)
  • Soil physics and reactive transport
  • Information theory and thermodynamics
  • Hydroinformatics


Dissertationspreis 2020 der Deutschen Hydrologischen Gesellschaft (DHG)

Dissertationspreis 2020 der Ehrensenator Huber Stiftung im Bereich Wasser


On how data are partitioned in model development and evaluation: Confronting the elephant in the room to enhance model generalization
Maier, H. R.; Zheng, F.; Gupta, H.; Chen, J.; Mai, J.; Savic, D.; Loritz, R.; Wu, W.; Guo, D.; Bennett, A.; Jakeman, A.; Razavi, S.; Zhao, J.
2023. Environmental Modelling and Software, 167, Art.-Nr.: 105779. doi:10.1016/j.envsoft.2023.105779VolltextVolltext der Publikation als PDF-Dokument
Understanding the hydrological response of a headwater-dominated catchment by analysis of distributed surface–subsurface interactions
Özgen-Xian, I.; Molins, S.; Johnson, R. M.; Xu, Z.; Dwivedi, D.; Loritz, R.; Mital, U.; Ulrich, C.; Yan, Q.; Steefel, C. I.
2023. Scientific Reports, 13 (1), Art.-Nr.: 4669. doi:10.1038/s41598-023-31925-wVolltextVolltext der Publikation als PDF-Dokument
Histogram via entropy reduction (HER): an information-theoretic alternative for geostatistics
Thiesen, S.; Vieira, D. M.; Mälicke, M.; Loritz, R.; Wellmann, J. F.; Ehret, U.
2020. Hydrology and earth system sciences, 24 (9), 4523–4540. doi:10.5194/hess-24-4523-2020VolltextVolltext der Publikation als PDF-Dokument
A topographic index explaining hydrological similarity by accounting for the joint controls of runoff formation
Loritz, R.; Kleidon, A.; Jackisch, C.; Westhoff, M.; Ehret, U.; Gupta, H.; Zehe, E.
2019. Hydrology and earth system sciences, 23 (9), 3807–3821. doi:10.5194/hess-23-3807-2019VolltextVolltext der Publikation als PDF-Dokument
Energy states of soil water – a thermodynamic perspective on soil water dynamics and storage-controlled streamflow generation in different landscapes
Zehe, E.; Loritz, R.; Jackisch, C.; Westhoff, M.; Kleidon, A.; Blume, T.; Hassler, S. K.; Savenije, H. H.
2019. Hydrology and earth system sciences, 23 (2), 971–987. doi:10.5194/hess-23-971-2019VolltextVolltext der Publikation als PDF-Dokument
On the dynamic nature of hydrological similarity
Loritz, R.; Gupta, H.; Jackisch, C.; Westhoff, M.; Kleidon, A.; Ehret, U.; Zehe, E.
2018. Hydrology and earth system sciences, 22 (7), 3663–3684. doi:10.5194/hess-22-3663-2018VolltextVolltext der Publikation als PDF-Dokument
Picturing and modeling catchments by representative hillslopes
Loritz, R.; Hassler, S. K.; Jackisch, C.; Allroggen, N.; Van Schaik, L.; Wienhöfer, J.; Zehe, E.
2017. Hydrology and earth system sciences, 21 (2), 1225–1249. doi:10.5194/hess-21-1225-2017VolltextVolltext der Publikation als PDF-Dokument

Sonstige Publikationen


Conference presentations (Oral)

  • Loritz, R. (Invited, 2021): The role of energy and information in hydrological modelling, Tag der Hydrolgie, Award Lecture, Best german dissertation in Hydrologie 2020

  • Loritz, R. (Invited, 2021): Bridging the gap between bottom-up and top-down models in catchment hydrology, SIAM Conference on Mathematical & Computational Issues in the Geosciences (GS21)

  • Loritz, R., Ehret, U., Neuper, M., and Zehe, E. (2020): The case of distributed rainfall and spatially adaptive modeling, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-6789, https://doi.org/10.5194/egusphere-egu2020-6789

  • Loritz, R. (Invited, 2019): The role of information in hydrological models, Institute for Modelling Hydraulic and Environmental Systems, Stuttgart, Germany

  • Loritz, R., Gupta, H., C. Jackisch, M. Westhoff, A. Kleidon, U. Ehret, and Zehe, E. (2018): On the dynamic nature of hydrological similarity, European Geosciences Union General Assembly, Vienna, Austria

  • Loritz, R. (Invited. 2017): Is there an optimum? How information theory and thermodynamics can help to identify the needed spatial complexity of hydrological models, Workshop - Improving the theoretical underpinnings of hydrologic models - Sopron, Hungary

  • Loritz, R., Neuper, M., Gupta, H., and Zehe, E. (2017): How to handle spatial heterogeneity in hydrological models. European Geosciences Union General Assembly 2017, Vienna. Austria

  • Loritz, R., Hassler, S., Jackisch, C., and Zehe, E. (2016): Picturing and modelling catchments by representative hillslopes. European Geosciences Union General Assembly 2016, Vienna. Austria


Conference presentations (Poster) and co-author contributions

  • Presentation - Ehret, U., van Pruijssen, R., Bortoli, M., Loritz, R., Azmi, E., and Zehe, E. (2020): Dynamical clustering: A new approach to make distributed (hydrological) modeling more efficient by dynamically detecting and removing redundant computations, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-4772, https://doi.org/10.5194/egusphere-egu2020-4772

  • Poster - Sternagel, A., Loritz, R., Wilcke, W., and Zehe, E. (2020): Simulating preferential soil water flow and reactive solute transport using the Lagrangian Soil Water and Solute Transport Model (LAST), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-7172, https://doi.org/10.5194/egusphere-egu2020-7172

  • Poster - Villinger, F., Loritz, R., and Zehe, E.: Towards a better understanding and modelling of Hortonian overland flow during flash flooding (2020), EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19680, https://doi.org/10.5194/egusphere-egu2020-19680

  • Presentation - Zehe, E., Loritz, R., Ehret, U., Westhoff, M., Kleidon, A., and Mälicke, M. (2018): From catchment organization to dynamic functional similarity, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19632, https://doi.org/10.5194/egusphere-egu2020-19632, 2020

  • Presentation - Jackisch, C., Kleidon, A., Loritz, R., and Zehe, E. (2018): A thermodynamic interpretation of soil water retention and dynamics, EGU General Assembly 2018, Online, 8–13 April 2018

  • Poster - Kiese, N., Loritz, R., Allroggen, N. and Zehe, E. (2017): Influence of bedrock topography on the runoff generation under use of ERT data. Poster presentation. EGU General Assembly 2017. Vienna. Austria

  • Poster - Wienhöfer, J., Loritz, R. and Zehe, E. (2015): Model-based quantification of hydrological similarity at the hillslope scale. European Geosciences Union General Assembly 2015, Vienna. Austria

  • Poster - Loritz, R., Weiler, M. and Seibert, S. (2015): Data mining methods for predicting event runoff coefficients in ungauged basins using static and dynamic characteristics. European Geosciences Union General Assembly 2015, Vienna. Austria