Mapping and evaluation of sediment transport processes in the intermediate mower line, Johnsbachtal

The role and importance of sediment storage facilities in alpine catchment areas is not fully clarified (TRIMBLE 1995). However, in order to develop a better understanding of alpine landscape development, it is necessary to collect more data on sediment storage and sediment storage types for small alpine catchments (50 km). Further investigations of sediment storage and sediment transport processes are also needed in relation to landscape planning and natural hazard management (SCHROTT and ADMAS, 2002; Gutiérrez et al., 1998).

The aim of this master’s thesis is to develop an understanding of sediment transport processes and sediment storage in the intermediate area. This is to be achieved by means of a geomorphological mapping, the basis of which are the different types of sediment storage, and a GIS modeling on the intensity and importance of sediment transport processes presented by Theler and REYNARD (2008). Geomorphological mapping is a modern digital map product based on field studies, orthophoto interpretation and the analysis of digital terrain models. The second step is a raster-based analysis of the following parameters: Degree of vegetation cover, slope inclination and connectivity.

The results consisted of a geomorphological map of the intermediate mice route and maps of process intensity and sediment dynamics for the Gseng and Langgriesgraben.

The method of Theler and REYNARD (2008) is suitable as a preparatory tool to gain an overview of where and how strong sediment transport processes can be found (Theler et al. 2010). Unfortunately, only semi-quantitative statements on sediment transport can be made with this method and a quantification of sediment volumes is not yet possible. Nevertheless, the results are satisfactory in that the modelling of the process intensity appears geomorphologically plausible. Weaknesses in the approach are particularly evident in the modelling of the importance of sediment transport, since the transit of sediments from one geomorphological compartment to the next is not taken into account. With the greater emphasis on connectivity and the subdivision of catchment areas into subcatchments, this shortcoming could probably be addressed.