Abstract
Due to the global warming, an increase in the number and intensity of flash flood events triggered by heavy rain is expected. Flash flood risk management requires the identification of regions where the occurrence of flash flood events can be expected to become more frequent. In this study, we shed light on the occurrence and characteristics of flash floods in the state of Bavaria, Germany. A discharge time series of 342 gauging stations (average measurement period 1960–2017) was investigated with regard to the past flash flood events. The catchments of the selected gauging sites range from 1 to 500 km2 and are not affected by flood retention structures. Only half of the chosen gauging stations recorded flood events, which showed a short response time and a significant flood magnitude that were typical for flash floods. This led us to the conclusion that some catchments are more prone to flash floods than others. It was found that the flash flood occurrences are not evenly distributed over Bavaria, but rather form spatial clusters in the alpine region and the Bavarian Forest. The statistical evaluation of 5,732 flash flood hydrographs for different catchment sizes further deepened our understanding of the characteristics of this natural hazard in Bavaria.
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Acknowledgements
The research presented in this paper has been carried out as part of the HiOS project (Hinweiskarte Oberflächenabfluss und Sturzflut) funded by the Bavarian State Ministry of the Environment and Consumer Protection (StMUV) and supervised by the Bavarian Environment Agency (LfU). Furthermore, this work was supported by Deutsche Forschungsgemeinschaft (DFG) through the TUM International Graduate School of Science and Engineering (IGSSE). The authors would like to thank Davide Zoccatelli from the Hebrew University of Jerusalem for providing the MATLAB code for the flood separation.
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Kaiser, M., Borga, M., Disse, M. (2020). Occurrence and Characteristics of Flash Floods in Bavaria (Germany). In: Leal Filho, W., Nagy, G., Borga, M., Chávez Muñoz, P., Magnuszewski, A. (eds) Climate Change, Hazards and Adaptation Options. Climate Change Management. Springer, Cham. https://doi.org/10.1007/978-3-030-37425-9_16
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