Surface runoff in a torrent catchment area in Middle Europe and its prevention |
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Authors: | G Markart B Kohl R Kirnbauer H Pirkl H Bertle R Stern A Reiterer P Zanetti |
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Institution: | 1. Department of Natural Hazards and Alpine Timberline, Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Rennweg 1, Hofburg, A-6020, Innsbruck/Tyrol, Austria 2. Institute of Hydraulics, Hydrology and Water Resources Management, Faculty of Civil Engineering, University of Technology, Karlsplatz 13/223, A-1040, Vienna, Austria 3. Bureau for Geology and Geo-Ecology, Gentzgasse 17/1/6, 1180, Vienna, Austria 4. GEOGNOS Bertle Techn. Geologie ZT GmbH, Kronengasse 6, 6780, Schruns, Austria 5. R. Stern, Botanikerstra?e, 5a, A-6020, Innsbruck, Austria 6. Austrian Service for Avalanche and Torrent Control, Section Vorarlberg, Rheinstra?e 32/4, A-6900, Bregenz, Austria 7. Territorium Online–Geoinformatics, Siemensstra?e 19, I-39100, Bozen, Italy
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Abstract: | The Schesa, a sinister contributory torrent to the Ill river near Bludenz (federal province of Vorarlberg) is the largest
basin-shaped gully of Middle Europe and endangers the underlying villages by torrential debris flow and gigantic mass movements.
The catchment is characterized by a complex geological situation, high annual precipitation and torrential rains from spring
to early autumn, which cause enormous amounts of surface runoff. Based on field investigations comprising rain simulation
experiments on representative plots, investigations on land-use, vegetation cover, soil physical characteristics, geology,
hydrogeology and other features of the catchment area, surface runoff coefficient maps were developed. They formed the basis
for assessment of runoff potential for different scenarios in vegetation cover and land-use intensity. Calculation of runoff
for the recurrent design event by use of an improved run-time method showed the urgent necessity of runoff reduction measures
in large parts of the catchment area above the gully. Based on the modelling results a concept for reduction of both, surface
runoff and amount of deep percolating water has been elaborated. |
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Keywords: | erosion grazing impact gully interception land-use simulation of torrential rain surface runoff |
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