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Modelling of Spatial and Temporal Changes in Soil-Water Erosion

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Develop a methodology for dynamic modelling of soil-water erosion within a GIS environment.

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A dynamic approach in physically-based soil water erosion modelling within a GIS (GRASS) environment was used.
The application of the unit stream power theory and physical fields theory in water erosion modelling is presented.
Dynamics of the phenomenon are studied in both the short and long-term. Two visually interpreted aerial photographs of different contrast time horizons (years 1955 and 1990) were selected to derive the model input parameter - Manning's surface roughness coefficient. The method is tested on a small basin selected in Myjava hillyland.

Figure 1

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Results of the modelling document highlight the influence of two of the most important factors - relief and land cover/land use. These two factors control spatial and temporal changes in erosion and deposition pattern in both the

short-term (at the level of erosion event - left) and the long-term (right).
The work is targeted mainly at researchers working with soil-water erosion problems. Future work will verify obtained results by terrain mapping.

Figure 2 Figure 3

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Contact : Jaroslav Hofierka, Mestsky urad, Radnicne nam. 16, Bardejov, Slovakia
E-mail: hofierka@netlab.sk
Marcel Suri, Institute of Geography, Slovak Academy of Sciences, Bratislava, Slovakia
E-mail: suri@savba.sk