Correlation and spectral analysis of two hydrogeological systems in Central Italy

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Abstract
Univariate and bivariate spectral analyses were applied to the study of two karstic systems in the Central Apennines (Italy). The analyses allowed the characterization of the transformations between the input rainfall and the output discharge. Although the development of the karstification is very different, the two aquifers show very similar behaviour. Both systems present very high memory effects which modulate the input signal. The baseflow component predominates in both systems which seem to behave like porous aquifers.