Author(s): Reinhard Prenner; Boris Huber; Helmut Drobir
Linked Author(s): Reinhard Prenner, Helmut Drobir, Boris Huber
Keywords: Channel hydraulics; Compound channel; Velocity profile; Flowresistance; Fricton factor; Roughness parameter; Hydraulic model; One-dimensional modelling
Abstract: About 100 years ago the Wien River was regulated in an outstanding engineering achievement. The approximately rectangular cross-section of the river was constructed of concrete and partially of stone. Now, rehabilitation works along the 13-km-long river have made it necessary to investigate the hydraulic discharge capacity of a 2.1-km-long vaulted stretch during flood events. To calculate the water surface profiles caused by different flood loads an one-dimensional computer program was used and to verify the calculation assumptions with the actual flow behavior a straight hydraulic model was built. It had a scale of 1:15, a width of 1.4 m, a length of 15 m and operated with different slopes (1.5 % o and 3 % o). Friction losses in the planned ¡°new¡± river bed were determined. The influence of mixing effects in the interaction region between the rough main channel and the smooth overbank on the velocity distribution was investigated additionally. A variant study with a reduced cross-section-caused by the insertion of a ceiling to create an additional multipurpose area-was carried out as well. The suitability of application of the 1-dimensional calculation with the results of the experiments will be described and evaluated.
Year: 2001