Dirk Muschalla, professor at Graz University of Technology in Austria, will discuss the modeling of floods in urban areas. This conference will be in English.
In the last years, Central Europe sees an increase of urban flash floods due to local heavy storm events. Urbanization and global climate change are key drivers for this trend. Flood models are a useful tool to understand the dynamics of urban flash flood events. 1D-2D hydrodynamic models for pluvial floods (1D for the sewer model and 2D for surface flow in the case of surcharching) and 2D hydrodynamic models for fluvial floods currently define the state of the art for flood risk assessment. Due to the steep topography the presence of hillsides can significantly influence surface runoff generation in the context of urban flash flood events. For this reason, the interactions between i) hillside - urban creeks rivers and ii) hillside - urban area (including the sewer system) must be considered with regard to surface-runoff generation. These relationships require an integrated modelling approach comprising three subsystems (hillsides, urban flows and urban areas) and their interactions in multiple unidirectional and bidirectional ways. The result is an integrated model approach with the opportunity to calculate the resulting water depth and flow velocity on urban surfaces. Such models are a necessary basis for further analysis, e.g. urban flood risk assessment. In addition to the data needed and methods of model generation, a general approach to risk assessment will be discussed.
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