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Possibilities of including surface runoff barriers in the slope-length factor calculation in the GIS environment and its integration in the user-friendly LS-RUSLE tool

Author

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  • Jiří Brychta

    (Department of Geography, Faculty of Science, J. E. Purkyně University, Ústí nad Labem, Czech Republic)

  • Martina Brychtová

    (Department of Land Use and Improvement, Faculty of Environment, Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

The effect of the morphology is key aspect of erosion modelling. In Universal Soil Loss Equation (USLE) type methods, this effect is expressed by the topographic factor (LS). The LS calculation in GIS is performed by a unit contributing area (UCA) method and can mainly be influenced by the pixel resolution, by the flow direction algorithm and by the inclusion of a hydrologically closed unit (HCU) principle, the cutoff slope angle (CSA) principle and the ephemeral gullies extraction (EG) principle. This research presents a new LS-RUSLE tool created with the inclusion of these principles in the automatic user-friendly GIS tool. The HCU principle using a specific surface runoff interruption algorithm, based on pixels with NoData values at the interruption points (pixels), appears to be key. With this procedure, the occurrence of overestimation results by flow conversion was rapidly reduced. Additionally, the reduction of extreme L and LS values calculated in the GIS environment was reached by the application of the CSA and EG principles. The results of the LS-RUSLE model show the prospective use of this tool in practice.

Suggested Citation

  • Jiří Brychta & Martina Brychtová, 2020. "Possibilities of including surface runoff barriers in the slope-length factor calculation in the GIS environment and its integration in the user-friendly LS-RUSLE tool," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 15(4), pages 246-257.
    • Handle: RePEc:caa:jnlswr:v:15:y:2020:i:4:id:128-2019-swr
    DOI: 10.17221/128/2019-SWR
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    References listed on IDEAS

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    1. Miroslav Dumbrovský & Karel Drbal & Veronika Sobotková & Jana Uhrová, 2020. "An approach to identifying and evaluating the potential formation of ephemeral gullies in the conditions of the Czech Republic," Soil and Water Research, Czech Academy of Agricultural Sciences, vol. 15(1), pages 38-46.
    2. Pathak, P., 1991. "Runoff sampler for small agricultural watersheds," Agricultural Water Management, Elsevier, vol. 19(2), pages 105-115, March.
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