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• W3190367846 endingPage "126759" @default.
• W3190367846 startingPage "126759" @default.
• W3190367846 abstract "The aim of this paper is to explore how rainfall mechanisms and catchment characteristics shape the relationship between rainfall and flood probabilities. We propose a new approach of comparing intensity-duration-frequency statistics of maximum annual rainfall with those of maximum annual streamflow in order to infer the catchment behavior for runoff extremes. We calibrate parsimonious intensity-duration-frequency scaling models to data from 314 rain gauges and 428 stream gauges in Austria, and analyze the spatial patterns of the resulting distributions and model parameters. Results indicate that rainfall extremes tend to be more variable in the dry lowland catchments dominated by convective rainfall than in the mountainous catchments where annual rainfall is higher and rainfall mechanisms are mainly orographic. Flood frequency curves are always steeper than the corresponding rainfall frequency curves with the exception of glaciated catchments. Based on the proposed approach of combined intensity-duration-frequency statistics we analyze elasticities as the percent change of flood discharge for a 1% change in extreme rainfall through comparing rainfall and flood quantiles. In wet catchments, the elasticities tend to unity, i.e. rainfall and flood frequency curves have similar steepness, due to persistently high soil moisture levels. In dry catchments, elasticities are much higher, implying steeper frequency curves of floods than those of rainfall, which is interpreted in terms of more skewed distributions of event runoff coefficients. While regional differences in the elasticities can be attributed to both dominating regional rainfall mechanisms and regional catchment characteristics, our results suggest that catchment characteristics are the dominating controls. With increasing return period, elasticities tend towards unity, which is consistent with various runoff generation concepts. Our findings may be useful for process-based flood frequency extrapolation and climate impact studies, and further studies are encouraged to explore the tail behavior of elasticities." @default.
• W3190367846 created "2021-08-16" @default.
• W3190367846 creator A5015678021 @default.
• W3190367846 creator A5032427745 @default.
• W3190367846 creator A5054301335 @default.
• W3190367846 creator A5076465658 @default.
• W3190367846 date "2021-11-01" @default.
• W3190367846 modified "2023-10-15" @default.
• W3190367846 title "Understanding the relationship between rainfall and flood probabilities through combined intensity-duration-frequency analysis" @default.
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• W3190367846 doi "https://doi.org/10.1016/j.jhydrol.2021.126759" @default.
• W3190367846 hasPublicationYear "2021" @default.

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