University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Rupert Gasser
(2022):
Entwicklung eines nachhaltigen Sedimentmanagement Konzeptes am Wasserkraftwerk Graun.
Master / Diploma Thesis - Institut für Wasserbau, Hydraulik und Fließgewässerforschung (IWA),
BOKU-Universität für Bodenkultur,
pp 98.
UB BOKU
obvsg
- Abstract:
- The progress of glacier retreat and the steady lowering of the permafrost level increased the sediment accumulation in high alpine water reservoirs and is intensifying the related issue over the last years. In order to maintain the functionality of the reservoirs and the passthrough of the sediments, innovative solutions must be found, where ecological and economical aspects must be considered. In this master thesis a method of sediment management which is ecologically as well as economically feasible and sustainable. With the help of a suction dredger the sediment, which is flushed in large quantities into the reservoirs by the Karlinbach, could be gently pumped back during the summer months into the river. The aim of my work is to check whether sedimentation in the reservoir can be increased by techical measures, in order to better protect the hydroelectric turbine against abrasion and whether the use of a suction dredger would be facilitated by such constructional measures. For this purpose, a variant analysis was carried out using the numerical model Hydro_AS-2D and Hydro_FT_-2D. The results of the investigations show that specific structural measures can increase the sedimentation performance in the basin and as a consequence the turbine could be better protected against abrasion. Due to the high proportion of glacier shear debris, which is characterized by extremely slow sinking velocities, no significant effects could be detected that would facilitate the use of a suction dredger. Hydro_AS-2D provided an improved process understanding for the evaluation of the different variants. The bedload and suspended sediment modelling provided first insights into the sediment dynamics of a reservoir, but need to be further investigated by additional analyses.
- Beurteilende*r: Hauer Christoph
- 1.Mitwirkender: Flödl Peter