The effect of different pedotransferfunctions on the spatial distribution and intensity of runoff processes using the hydrological model WaSiM-ETH.
- University of Trier, Physical Geographie, Germany (mathias_jackel@web.de)
Pedotransferfunctions (PTF) play a major role in physically based hydrological modeling, as they establish the relationship between soil properties and the water stress curve. The selection of the PTF thus has a great influence on the water balance of a catchment in general, as well as on the spatial distribution and intensity of runoff processes. In this study, these very influences of PTF's on the runoff processes will be investigated. The hydrological model "WaSiM-ETH", which was calibrated and validated, is used for the investigations. On the basis of this modeling, 11 further scenarios were created, which differ only in their PTFs. In all scenarios an artificial weather event is applied, which includes a constant heavy precipitation of 100 mm as well as input data, which excludes the generation of interfering processes e.g., evaporation or snowfall. In addition, these scenarios will be applied to different system conditions to determine the differences of dry, humid, and wet system preconditions. Ultimately, the precipitation intensity but not the amount of the artificial weather event will also be varied to be able to determine any change in the dominant runoff processes due to precipitation intensity. The results of the modeling will then be compared using the generated surface runoff, interflow, and deep infiltration. In addition, a check of the modeling with a runoff process map available for the catchment area as well as a pattern comparison using the spatial efficiency metric (SPEAF) will be performed. It is expected that the different PTF´s per se, as well as depending on the system precondition and precipitation intensity, will result in very different spatial distributions and dominance of the individual runoff processes. Thus, one goal is to find the PTF´s that provide comprehensible distributions and intensities of the considered runoff processes.
How to cite: Jackel, M., Casper, M., and Mohajerani, H.: The effect of different pedotransferfunctions on the spatial distribution and intensity of runoff processes using the hydrological model WaSiM-ETH., EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-8027, https://doi.org/10.5194/egusphere-egu22-8027, 2022.