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An operational flood warning system for poorly gauged basins: demonstration in the Guadalhorce basin (Spain)
Versini, Pierre Antonie; Berenguer Ferrer, Marc; Corral Alexandri, Carles; Sempere Torres, Daniel
Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica; Universitat Politècnica de Catalunya. CRAHI - Centre de Recerca Aplicada en Hidrometeorologia
This paper deals with the presentation of a flood warning system (GFWS) developed for the specific characteristics of the Guadalhorce basin (3,200 km2, SE of Spain), which is poorly gauged and often affected by flash and plain floods. Its complementarity with the European flood alert system (EFAS) has also been studied. At a lower resolution, EFAS is able to provide a flood forecast several days in advance. The GFWS is adapted to the use of distributed rainfall maps (such as radar rainfall estimates), and discharge forecasts are computed using a distributed rainfall–runoff model. Due to the lack of flow measurements, the model parameters calibrated on a small watershed have been transferred in most of the basin area. The system is oriented to provide distributed warnings and fulfills the requirements of ungauged basins. This work reports on the performance of the system on two recent rainfall events that caused several inundations. These results show how the GFWS performed well and was able to forecast the location and timing of flooding. It demonstrates that despite its limitations, a simple rainfall–runoff model and a relatively simple calibration could be useful for event risk management. Moreover, with low resolution and long anticipation, EFAS appears as a good complement tool to improve flood forecasting and compensate for the short lead times of the GFWS.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
Hydrometeorology -- Spain -- Gualhorce basin
Flood warning systems
Hydrology
Ungauged basin
Hidrometeorologia -- Guadalhorce (Andalusia : Riu)
info:eu-repo/semantics/publishedVersion
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