(Proceedings of Symposium S7 held during the Seventh IAHS Scientific Assembly at Foz do Iguacu, Brazil, April 2005. IAHS Publication 303,2006, pp. 431)
In order to help the hydroloigical regionalization, the analysis of precipitation and runoff data was done through the wavelet transform. This analysis seeks to help water administration personnel to take decisions on Predictions in Ungauged Basins, Providing more details concerning the information about the precipitation and runoff patterns within a region. Data from rainfall and runoff stations in Piranhas-Acu River basin, located in semiarid northeastern Brazil, were used and the wavelet transforms were applied to these time series in order to determine zones within the region. In spite of the rainfall wavelet power spectra showed to be very similar, the global wavelet spetra of the main frequency components of the stream flow time series revealed different patterns. A total of 12 rainfall and runoff time series were assessed and their global wavelet spectra, together with the band scaleaverage time series, can be considered useful for determining the hydrological zones within a region.
Rainfall data, Runoff data, Multiscale analysis, Wavelet
