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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Weather types, runoff and sediment yield in a Mediterranean mountain landscape

Auteur(s) et Affiliation(s)

Dept. de Geografía, Inst. Univ. de Investigación de Ciencias Ambientales de Aragón, Univ., Zaragoza, Espagne
CORTESI, N.
Dept. de Geografía, Inst. Univ. de Investigación de Ciencias Ambientales de Aragón, Univ., Zaragoza, Espagne
Dept. de Geografía, Inst. Univ. de Investigación de Ciencias Ambientales de Aragón, Univ., Zaragoza, Espagne


Description :
The study was performed between 2005 and 2012 using daily databases of rainfall, runoff and sediment recorded in the Spanish Pyrenees, coupled with synoptic weather types (WTs) defined from the National Meteorological Center/National Center for Atmospheric Research (NMC/NCAR) 40-Year Reanalysis Project. The results show that the 3 wettest WTs accounted for 30% of rainy days and 46% of rainfall, but comprised only 13% of total daily records. To obtain a much more robust association between WTs and rainfall an analysis was carried out using a longer rainfall record (1989–2011). The analyses confirmed that the results obtained from the Araguás catchment are representative of a longer time span. The cyclonic, north-westerly and westerly WTs play an important role in runoff generation, coinciding with the wettest WTs. Extreme floods are commonly associated also with south-westerly and westerly airflows, whereas less flooding was generated under cyclonic circulations. Seasonal differences exist in WT frequency.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 4, p. 427-437, nombre de pages : 11, Références bibliographiques : 2 p.

Date :
2014

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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