The impact of a tributary that carries high amounts of bed-load on the deposition of sediment downstream of a run-of river plant [Die Auswirkungen eines Geschiebe führenden Zubringers auf die verlandungssituation im unterwasser eines laufkraftwerkes]
Schneider J.,InstitutfurWasserbau und Wasserwirtschaft der TU Graz |
Sindelar C.,InstitutfurWasserbau und Wasserwirtschaft der TU Graz |
Feldbacher R.,InstitutfurWasserbau und Wasserwirtschaft der TU Graz |
Knoblauch H.,InstitutfurWasserbau und Wasserwirtschaft der TU Graz
WasserWirtschaft | Year: 2011
For guaranteeing a sustainable sediment management on a chain of run-of river plants in the Salzach valley in Austria nearly annual flushings have been performed. The sediments that are removed out of the reservoirs tend to deposit immediately downstream of the dams mainly at the outlet of the turbines due to widening or reduced slope. During the physical model tests, which were performed for the hydro power plant St. Veit, it could be observed that the boundary conditions were obviously wrong because in the prototype much more sediment was settled as in the model. A downstream located tributary was found responsible because of its dumping of high amounts of bed load into the river Salzach. This led to a backwater flow respectively reduced shear stresses. Further model tests resulted in a successful solution which mitigates the situation substantially.