Análisis correlatorio y espectral de los caudales del manantial de Iturriotz (Vizcaya): El sistema del barranco de Peñalba como ejemplo de un tipo de Karst de caraclerísticas mixtas

Abstract

In order to define the structure of the time series of rainfall and discharge, and also to improve the knowledge of the Barranco Peñalba karstic system, a correlation and spectral analysis has been made of the Iturriotz spring and the Juncal pluviometer data (period: 6^th August 1983 to 12^th October 1985). Such analysis reveals a relatively important memory effect and a regulation time of 23,5 days. However, it has been made clear a very small modulation effect with a spectral band of 0.30-0.32. The cross correlation reveals a lag very small between the input and output signals, in spite of the existence of a some regulation power at the end of the impulsional answer. These results do not match exactly any of the type-model defined by Mangin (1982), but suggests a system with mixed characteristics. The apparently contradictory features inferred from this analysis can be atributed to the heterogeneity of the aquifer materials and to the complexity of the recharge mecanisms.