Analysis of Extreme Floods, Specification of Drivers of Changes and Assessment of their Regional Specific Characteristics – Data Based Approaches

The analysis of extreme events is one of the key aims of the Research Unit. Since every project contributes in numerous ways, this task force will provide a guideline for the analysis of extreme events. The starting point to understanding extreme events is a flood typology, which can either be meteorologically driven (SP4) or based on hydrographs (SP1). Here, two automatic typing approaches will be applied. Once the types have been assigned, floods can be further analysed regarding their runoff generating processes and the antecedent conditions, where methods such as the estimation of antecedent soil moisture or the spatial and temporal distribution of runoff generation are developed by SP1 and SP4. Climatological drivers linked to certain flood types, such as floods related to atmospheric blocking or Vb cyclones, are analysed by SP2. As flood events are modified within a river basin, e.g. by dike breaches or flood wave superposition, the interactions of tributary components have to be considered. Methods to assess these impacts are developed in SP3. Finally, changing flood regimes are attributed to their drivers in SP6. The aim of this task force will be the development of an automated step-by-step procedure to combine these different approaches in analyses of the anatomy of floods, a characterization of flood regimes based on such data analyses and a categorization of flood regime types in Germany and Austria.

The head of the task force will be A. Schumann (SP1), members are S. Vorogushyn (SP3), B. Merz (SP3), R. Merz (SP4), G. Blöschl (SP6) and B. Ahrens (SP2)