Analyses of extreme flooding in Austria over the period 1951–2006

摘要: Analyses of extreme flooding in Austria is performed using daily discharge time series from 27 stations over the period 1951-2006. The main research questions revolve around: (1) temporal non-stationarities flood record, (2) upper tail and scaling properties peak records, (3) relation between magnitude frequency North Atlantic Oscillation (NAO). Two datasets are derived series: annual maximum peaks-over-threshold (POT) data. validity stationarity assumption record assessed by investigating presence abrupt slowly varying changes nonparametric tests. tested for both mean variance distributions means Pettitt test. monotonic trends investigated Mann-Kendall Spearman Violations associated with rather than gradual changes. These step generally involve river regulation through construction dams or other major engineering works. It not possible to make conclusive statements about an anthropogenic climate change signal record. Similar conclusions obtained when focussing on POT floods. Generalised Extreme Value distribution used study records. location scale parameters exhibit power-law behaviour as a function drainage area. shape indicate that have heavy tail. Non-stationary modelling explore NAO. results NAO significant covariate explaining occurrence large part Austria. Copyright © 2011 Royal Meteorological Society