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Gewählte Master / Diploma Thesis:

Michael Rauch (2021): Untersuchung extremer Erosionsereignisse und Bestimmung ihrer Jährlichkeiten in Petzenkirchen, Niederösterreich.
Master / Diploma Thesis - Institut für Bodenphysik und landeskulturelle Wasserwirtschaft, BOKU-Universität für Bodenkultur, pp 90. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
In this work, an attempt is made to determine the return period of soil erosion events in the Hydraulic Open Air Laboratory in Petzenkirchen, Lower Austria. For this purpose, input data on climate, slope topography, landmanagement and soil, measured or determined from the area, were used to perform erosion modeling with WEPP. To test the differences in erosion behavior of different slope topographies and field managements, four different slopes were simulated, each with three different managements. The crops grown are corn and winter wheat and additionally a variant with a catch crop. WEPP is a physically based computer model which simulates the soil erosion, using the before mentioned input data, and calculates the amounts of soil erosion for the respective events. Using various distribution functions, the results from WEPP were used to determine the return period of erosion events. The simulation results from WEPP show that erosion events tend to be more extreme for corn than for winter wheat. The events with the greatest amounts of erosion are always during periods of corn cultivation. Winter wheat also has erosion events that sometimes exceed the mean annual events, but this is definitely not as often the case as with corn. It was also found that the erosion events mainly occur in the summer months. This is due to the fact that the rainfall events with the highest intensities also occur in the summer months. The determination of the return periods with a distribution function sometimes works well, other times it is difficult. For variants with many erosion events a fitting of the function to a data set is well possible. For variants with just a few erosion events and widely scattered erosion amounts, a determination of the return period is less satisfying.

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