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Geomorphological consequences of frequent and infrequent rainfall and hydrological events in Pyrenees Mountains of Spain

Otros títulosFluvial hazards in a mountainous Mediterranean area
Geomorphological consequences of fraquent and infrequent rainfall and hydrological events in Pyrennez Mountains of Spain
AutorGarcía-Ruiz, José María ; Martí Bono, Carlos Enrique ; Lorente, Adrián; Beguería, Santiago
Palabras clavedebris flows
extreme events
geomorphic thresholds
sediment transport
Spanish Pyrenees
Fecha de publicaciónoct-2004
CitaciónMitigation and Adaptation Strategies for Global Change 7 (3): 202-320 (2002)
ResumenVarious aspects of pluviometric andhydrological events have been studiedworldwide, one of which is the geomorphichazards as the intensity of the eventsexceeds various geomorphic thresholds.During the last few years, rainstorms ofdifferent intensities have occurred in theCentral Spanish Pyrenees, including one ofexceptional character. Large, historicaldebris flows have been studied, as well asthe actual sediment transport in smallexperimental catchments. This study showsthat during the most frequent eventssuspended sediment transport is the commongeomorphic process. Bedload is mobilizedseveral times per year while small rockavalanches and channelized debris flowshave a return period of at least 5 years.Hillslope debris flows are triggered byrainfall events with a 25–30 year returnperiod. Reactivation of large, deep massmovements is linked to rainfalls of around100 year return period (between 130 and160 mm in 24 hours). Catastrophicgeomorphic processes occur whenprecipitation exceeds a 100 year returnperiod, as was the case of the Biescascampsite disaster. Geomorphic processestriggered by intense rainfall events havecaused major damage and human disastersbut the hazards have been reduced by theintroduction of several control measures,including reforestation, the constructionof check-dams, canalization of riversegments and improved flood forecasting.
Descripción32 Pag., 1 Tabl., 6 Fig. The definitive version is available at: www.springerlink.com La versión final del editor contiene erratas finales en su título. El preprint inicial tuvo un título diferenciado.
Versión del editorhttp://dx.doi.org/10.1023/A:1024479630433
ISSN1381-2386 (Print)
1573-1596 (Online)
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