Preprints
https://doi.org/10.5194/soil-2020-62
https://doi.org/10.5194/soil-2020-62

  09 Nov 2020

09 Nov 2020

Review status: this preprint is currently under review for the journal SOIL.

Improved calibration of Green-Ampt infiltration in the EROSION-2D/3D model using a rainfall-runoff experiment database

Hana Beitlerová1, Jonas Lenz2, Jan Devátý3, Martin Mistr1, Jiří Kapička1, Arno Buchholz2, Ilona Gerndtová4, and Anne Routschek2 Hana Beitlerová et al.
  • 1Research Institute for Soil and Water Conservation, Prague, Czech Republic
  • 2Soil and Water Conservation Unit, TU Bergakademie Freiberg, Freiberg, Germany
  • 3Czech Technical University in Prague, Prague, Czech Republic
  • 4Research Institute of Agricultural Engineering, Prague, Czech Republic

Abstract. Soil infiltration is one of the key factors that has an influence on soil erosion caused by rainfall. Therefore, a well-represented infiltration process is a necessary precondition for successful soil erosion modelling. Complex natural conditions do not allow the full mathematical description of the infiltration process and additional calibration parameters are required. The Green-Ampt based infiltration module in the EROSION-2D/3D model is adjusted by calibration of the skinfactor parameter. Previous studies provide skinfactor values for several combinations of soil and vegetation conditions. However, their accuracies are questionable and estimating the skinfactors for other than the measured conditions yields significant uncertainties in the model results. This study presents new empirically based transfer functions for skinfactor estimation that significantly improve the accuracy of the infiltration module and thus the overall EROSION-2D/3D model performance. The transfer functions are based on a statistical analysis of the rainfall-runoff simulation database, which contains 273 experiments compiled by two independent working groups. Linear mixed effects models, with a manual backward elimination approach for the predictor selection, were applied to derive the transfer functions. Soil moisture and bulk density were identified as the most significant predictors explaining 79 % of the skinfactor variability, followed by the soil texture and the impact of previous rainfall events. The mean absolute percentage error of the skinfactor prediction was improved from 192 % using the currently available method, to 66 % using the presented transfer functions. Error propagation of the predicted skinfactors into the surface runoff and soil loss on the hypothetical slope showed significant improvement in the EROSION-2D/3D results. A first validation of real rainfall-runoff events indicates good model performance for events with a higher total precipitation and intensity.

Hana Beitlerová et al.

 
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Hana Beitlerová et al.

Hana Beitlerová et al.

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Short summary
The soil infiltration process cannot be mathematically fully described due to the complex natural conditions, and additional calibration parameters are required for soil erosion modeling. We present transfer functions for calibration parameter of Green-Ampt infiltration module of EROSION-2D/3D model, which are significantly improving the model performance. The study is based on statistical analysis of an extensive rainfall-runoff experiment database.