Abstract
Dam break wave simulation provides data for emergency management. The calculation results should be as accurate as possible. The modeler has to deal with different sources of uncertainty. The paper presents dam break calculation for three different dams in order to assess the uncertainty due to the chosen model (1D or 2D), different terrain models and different Manning's n values. The comparison of the calculation results is focused on the maximum discharge, maximum water level and flood wave arrival time.
Highlights
Maximum discharge and maximum water level An emergency strategy is based on potential inundation maps
Uncertainty in maximum discharge is significant as it causes uncertainties in maximum water level
The inundation mapping for a hypothetical dam break event is said to be continued if the maximum discharge due to the dam break wave is equal or higher than the local value of the 1-in-100-year flood
Summary
Dam break inundation studies were done both with a uniform surface roughness [1,2] and with Manning’s n values depending on the land cover [8,9]. In order to assess the combined influence of a high-resolution terrain model as well as its representation in a hydrodynamic model and of the roughness parameter dam break wave calculations for three different hypothetical failing dams are compared: Results are discussed regarding the maximum discharge and the maximum water level along the river reach downstream the dams and the flood wave arrival time.
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