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| Titel |
FlooDSuM - a decision support methodology for assisting local authorities in flood situations |
| VerfasserIn |
Jan Schwanbeck, Rolf Weingartner |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094890
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| Publikation (Nr.) |
 EGU/EGU2014-10325.pdf |
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| Zusammenfassung |
| Decision making in flood situations is a difficult task, especially in small to medium-sized
mountain catchments (30 – 500 km2) which are usually characterized by complex
topography, high drainage density and quick runoff response to rainfall events. Operating
hydrological models driven by numerical weather prediction systems, which have a lead-time
of several hours up to few even days, would be beneficial in this case as time for prevention
could be gained. However, the spatial and quantitative accuracy of such meteorological
forecasts usually decrease with increasing lead-time. In addition, the sensitivity of
rainfall-runoff models to inaccuracies in estimations of areal rainfall increases with
decreasing catchment size. Accordingly, decisions on flood alerts should ideally
be based on areal rainfall from high resolution and short-term numerical weather
prediction, nowcasts or even real-time measurements, which is transformed into runoff
by a hydrological model. In order to benefit from the best possible rainfall data
while retaining enough time for alerting and for prevention, the hydrological model
should be fast and easily applicable by decision makers within local authorities
themselves.
The proposed decision support methodology FlooDSuM (Flood Decision Support
Methodology) aims to meet those requirements. Applying FlooDSuM, a few successive
binary decisions of increasing complexity have to be processed following a flow-chart-like
structure. Prepared data and straightforwardly applicable tools are provided for each of these
decisions. Maps showing the current flood disposition are used for the first step. While danger
of flooding cannot be excluded more and more complex and time consuming methods will be
applied. For the final decision, a set of scatter-plots relating areal precipitation to peak flow is
provided. These plots take also further decisive parameters into account such as storm
duration, distribution of rainfall intensity in time as well as the catchment’s antecedent
moisture conditions.
The proposed approach is currently tested in two catchments in the Swiss Pre-Alps and
Alps. We will show the general setup and selected results. The findings of those case studies
will lead to further improvements of the proposed approach. |
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