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| Titel |
A coupling of hydrologic and hydraulic models appropriate for the fast floods of the Gardon River basin (France) |
| VerfasserIn |
O. Laganier, P. A. Ayral, D. Salze, S. Sauvagnargues |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 14, no. 11 ; Nr. 14, no. 11 (2014-11-05), S.2899-2920 |
| Datensatznummer |
250118744
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| Publikation (Nr.) |
 copernicus.org/nhess-14-2899-2014.pdf |
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| Zusammenfassung |
| Mediterranean catchments are regularly affected by fast and flash floods.
Numerous hydrologic models have been developed, and allow modelling of these
floods. However, these approaches often concern average-size basins of a few
hundred km2. At larger scales (>1000 km2), coupling of
hydrologic and hydraulic models appears to be an adapted solution. This study
has as its first objective the evaluation of the performances of a coupling
of models for flood hydrograph modelling. Secondly, the coupling results are
compared with those of other modelling options. The aim of these comparisons
is to clear up the following points. (1) Is a simplified routing model (lag
and route) as efficient as a full hydraulic model for the modelling of
hydrographs, in the intermediary downstream part of the stream? (2) Is adding
lateral inflows necessary for all studied events? (3) What is the impact of
the qualities of upstream hydrologic modelling feeding the coupling? The
coupling combines the SCS–LR (Soil Conservation
Service–lag-and-route) hydrologic model of the ATHYS platform and the MASCARET 1-D
hydraulic model based on full Saint-Venant equations. It is applied to the
Gardon River basin (2040 km2) in the south of France. For the seven
studied events, the results of the coupling are satisfactory, the calculated
Nash indexes varying between 0.61 and 0.97. The comparisons with the other
modelling options show the important role of the spatial distribution of
rains during events: when rains are centered on the intermediary downstream
part of the catchment, adding lateral inflows is necessary; when rains are
more important in the upstream part, the quality of the hydrologic modelling
upstream of the coupling has a strong impact. Furthermore, the used coupling
of models seems well adapted for water rising and flooded area forecasting.
The future developments of the tool will concentrate on this point. |
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