Abstract
This chapter proposes and applies an extreme value assessment framework, which allows for auto-correlation and non-stationarity in the extremes. This is, e.g., useful to assess the anticipated intensification of the hydrological cycle due to climate change. The costs related to more frequent or more severe floods are enormous. Therefore, an adequate estimation of these hazards and the related uncertainties is of major concern. Exceedances over a threshold are assumed to be distributed according to a generalised Pareto distribution and we use a point process to approximate the data. In order to eliminate auto-correlation, the data are thinned out. Contrary to ordinary extreme value statistics, potential non-stationarity is included by allowing the model parameters to vary with time. By this, changes in frequency and magnitude of the extremes can be tracked. The model which best suits the data is selected out of a set of models which comprises the stationary model and models with a variety of polynomial and exponential trend assumptions. Analysing winter discharge data of about 50 gauges within the Danube River basin, we find trends in the extremes in about one-third of the gauges examined. The spatial pattern of the trends is not immediately interpretable. We observe neighbouring gauges often to display distinct behaviour, possibly due to non-climatic factors such as changes in land use or soil conditions. Importantly, assuming stationary models for non-stationary extremes results in biased assessment measures. The magnitude of the bias depends on the trend strength and we find up to 100% increase for the 100-year return level. The results obtained are a basis for process-oriented, physical interpretation of the trends. Moreover, common practice of water management authorities can be improved by applying the proposed methods, and costs for flood protection buildings can be calculated with higher accuracy.
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Acknowledgements
The study presented was partly carried out within the framework of the project Skalenanalyse.We thank the German Federal Ministry of Science for financial support (under grant no. 0330271) and the Bavarian Environmental Protection Agency for discharge data.
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Kallache, M., Rust, H.W., Lange, H., Kropp, J.P. (2011). Extreme Value Analysis Considering Trends: Application to Discharge Data of the Danube River Basin. In: Kropp, J., Schellnhuber, HJ. (eds) In Extremis. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14863-7_8
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DOI: https://doi.org/10.1007/978-3-642-14863-7_8
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