期刊
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
卷 57, 期 3, 页码 445-459出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2012.666351
关键词
rainfall-runoff events; temporal variability; runoff coefficient; subsurface flow; agroforestry catchment; northwest Spain
资金
- Spanish Ministry of Education and Science [REN2003-08143]
- Xunta of Galicia [PGIDIT05RAG10303PR]
The hydrological response of a small agroforestry catchment in northwest Spain (Corbeira catchment, 16 km(2)) is analysed, with particular focus on rainfall events. Fifty-four rainfall-runoff events, from December 2004 to September 2007, were used to analyse the principal hydrological patterns and show which factors best explain the hydrological response. The nonlinearity between rainfall and runoff showed that the variability in the hydrological response of the catchment was linked to the seasonal dynamics of the rainfall and, to a lesser extent, to evapotranspiration. The runoff coefficient, estimated as the ratio between direct runoff and rainfall volume, on an event basis, was analysed as a function of rainfall characteristics (amount and intensity) and the initial catchment state conditions prior to an event, such as pre-event baseflow and antecedent rainfall index. The results revealed that the hydrological response depends both on the soil humidity conditions at the start of the event and on rainfall amount, whereas rainfall intensity presented only a significant correlation with discharge increment. The antecedent conditions seem to be a key point in runoff production, and they explain much of the response. The hydrographs are characterized by a steep rising limb, a relatively narrow peak discharge and slow recession limb. These data and the observations suggest that the subsurface flow is the dominant runoff process.
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