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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 19 (2011), Paper 6 Posted March 29, 2011 POSSIBLE CAUSES OF TEMPORAL CYCLES AND SCALE OF RUNOFF IN THE SÃO FRANCISO RIVER, BRAZIL
Djane F. da Silva1 2 Federal University of Pernambuco - UFPE, Varzea-Recife-Pernambuco, Brazil 3Federal University of Alagoas - UFAL, Maceio, Brazil ABSTRACT Understanding the mechanisms generating rainfall and runoff, its space-time variability, and its impacts, improves planning of agricultural activities and provides benefits to society at large. The objective of this paper is to use wavelet analysis to study the runoff in the Alto São Francisco sub-basin, examining the characteristics of inter-annual and seasonal variability, as well as determining the dominant temporal scales. Variability is dominated by a decadal scale, which is associated with other temporal scales. These include seasonal, inter-annual short, and inter-annual linked to the El Niño southern oscillation, which cause peaks of the runoff in the time series. Peak runoff cycles average 12 years, approximately coinciding with sunspot cycles. Reference: Da Silva, D.F., J.D. Galvíncio, and H.R.R. de Carvalho Almeida. 2011. Possible causes of temporal cycles and scale of runoff in the São Franciso River, Brazil. Journal of Environmental Hydrology, Vol. 19, Paper 6. CONTACT: Josiclêda D. Galvíncio Professor, Department of Geographical Sciences University Federal of Pernambuco - UFPE Varzea-Recife-Pernambuco, Brazil E-mail: josicleda.galvincio@ufpe.br |
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