EGU2020-18155
https://doi.org/10.5194/egusphere-egu2020-18155
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Simulating heavy rainfall events for parameterizing a first application of the physically based soil erosion model EROSION3D in South Africa

Andreas Kaiser1, Michael Geißler1, Jay Le Roux2, Marike Stander2, George van Zijl3, and Jussi Baade1
Andreas Kaiser et al.
  • 1FSU Jena, Physical Geography, Jena, Germany (kaiser.andreas@uni-jena.de)
  • 2University of the Free State, Department of Geography, Bloemfontein, South Africa
  • 3North West University, Natural and Agricultural Sciences, Potchefstroom, South Africa

Soil erosion is a frequently tackled field of research and plays a major role in land degradation. Representing a discontinuous process soil loss is strongly determined by single events, which leads to high demands on modelling approaches.

Here we present a first application of the physically-based soil erosion model EROSION3D in a South African setting within the framework of the project SALDi (South African Land Degradation Monitor). Parameterization of the model requires intensive field work in accordance to land use and management patterns, soil types and topography. The experimental determination of physical and hydrological processes for selected sites allows for an improvement of the modelling results. Thus, rainfall and runoff simulation campaigns were carried out on various sites with a 3 x 1 m² mobile rainfall simulator. Additionally, UAV and TLS surveying, soil sampling, laboratory analysis and digital soil mapping complemented the approach. The created datasets are firstly handled in EROSION2D to calibrate soil erosivity and hydraulic conductivity and then introduced to EROSION3D for including land use, precipitation, elevation, multi-layered soil properties, organic carbon content and additional model input parameters.

The modelling procedure was applied within the boundaries of a research catchment close to Ladybrand in the Free State for first test runs. Furthermore, the same approach showed distinct differences on a conventionally tilled field vs. a conservational approach. An upscaling to larger catchments will then be carried out in basins with protected soils within Kruger National Park to directly compare them to results from intensively cultivated agricultural sites adjacent to the park boundaries.

How to cite: Kaiser, A., Geißler, M., Le Roux, J., Stander, M., van Zijl, G., and Baade, J.: Simulating heavy rainfall events for parameterizing a first application of the physically based soil erosion model EROSION3D in South Africa, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-18155, https://doi.org/10.5194/egusphere-egu2020-18155, 2020

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