Author(s): W. Bechteler; K. Broich
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Keywords: No Keywords
Abstract: During the last decade the interest in the dam-break problem increased in the field of hydraulic engineering. In consequence various damerosion models have been developed. Most of these m odels use a quasi-steady-state technique basing on the classical hydraulic equations for reservoir outflow combined with the equations for sediment transport. T he proper choice of the sediment transport equation and the headloss/discharge coefficients are essential for a realistical simulation. When simplified models are used, the estim ation of the geometrical developement of the breach also becom es significant. An analysis of this three basic mechanisms has not been done yet. How ever such an analysis is neccessary for the evaluation of different dam erosion models. Therefore a mathem atical m odel called D EICH was developed, w hich provides the opportunity to investigate the sensivity of the param eters m entioned above. The calculation relates to a fixed dam geometry with homogeneous, non cohesive material. The sediment transport equations of Meyer-Peter/Muller, Smart, Engelund/Hansen, Vollmers/Pernecker, and Cristofano will be analysed. The significance of the choosen breach geometry and its influence on the mass transport will be explained. For validation, the num erical calculations were tested against experim ental data. The physical dam model was com posed of almost uniform sand. The waterlevel in the reservoir behind the breach and the erosion rate of the washed out material were measured with piezo pressure gauges which were recorded by a PC data acquisition system. The calculated data are fitted to the measured data. Using the obtained parameters a simulation of the Teton dam failure is performed. These results will be compared to those gained with different programs.
Year: 1991