Due to increasing flood events, the demands on flood forecast systems are presently high. In many countries these systems are used for emergency action and evacuation plans. Therefore the flood wave and its propagation have to be forecasted, which is usually carried out by numerical models. The focus of this thesis is the practical application of different complex models for flood modelling as well as the uncertainties of the model results. Therefore the derivation and principles of the necessary differential equations are consistently described. The investigation of model uncertainties, which is splitted into three steps, is predicated on modelling with a synthetic channel and a section of the river Oberer Main. At first the parameter uncertainty is based on Monte Carlo Simulations by varying the friction and elevation values in channel and overbank. To quantify the parameter sensitivity the Global Sensitivity Analysis is applied. It is shown that as a result of the parameter uncertainties, the water level varies up to 0.5 m, while 80% of the simulated water depths are in a range of 0.25 m. Generally the flood modelling takes place with different complex models, which is the second part of the uncertainty analyses. The results of one dimensional, two dimensional and hybrid models in the investigation area are compared. The representing of the topography and simplifying assumption in the different model concepts, especially the impulse interaction between channel and overbank discharge, has significant influence on the water level up to 0.25 m. As the third step, log jam and levee break are analysed by scenario simulations. By these effects the water level differs up to 0.7 m. Additionally the difference between manual and objective calibration is investigated. For the objective calibration the Shuffed Complex Evotion Method is successfully used. The results of both methods are almost equal, but the objective calibration could achieve better results while less modeller time is needed.    «

Due to increasing flood events, the demands on flood forecast systems are presently high. In many countries these systems are used for emergency action and evacuation plans. Therefore the flood wave and its propagation have to be forecasted, which is usually carried out by numerical models. The focus of this thesis is the practical application of different complex models for flood modelling as well as the uncertainties of the model results. Therefore the derivation and principles of the necessar...    »