Abstract
Correlation and cross-spectral analysis of hydrographs was performed on the karst area of the mountainous section of the Kupa River in two time periods. Since there are karst aquifers in this area that is a part of strategic groundwater reserves of potable water, such an analysis could give better insight into the behavior of these aquifers. The functions used to describe karst aquifers are the cross-correlation function, coherence function, gain function, and phase function. The outcomes of the analysis results were very similar in the two analyzed periods, suggesting that differences in input signals between these two periods do not affect the aquifer function as a system filter. The results of this research suggest that the aquifer and overburden layer characteristics have a much stronger influence than the change of input signal on the runoff regime in the considered period.
Highlights
The groundwater of the karst aquifers of the northern part of the Dinaric karst of Croatia belongs to the national strategic reserves of potable water
Groundwater of this aquifer is of very high quality, and since the karst aquifers are sensitive and vulnerable, deeper knowledge of the functioning of this aquifer is of the utmost importance
The response rate of springs on rainfall events can be associated with the karstification level of an aquifer, the thickness of the unsaturated zone, permeability of the overburden layers as well as field coverage with soil and vegetation
Summary
The groundwater of the karst aquifers of the northern part of the Dinaric karst of Croatia belongs to the national strategic reserves of potable water. For the first time, a spectral analysis is carried out in the northern area of the Dinaric karst of Croatia with the aim to characterize and more precisely define the functioning of this karst aquifer, within the newer period 1981–2012. For this purpose, two periods were taken, one closer to the beginning and the other near the end of the 1981–2012 period. We will apply these methods to our hydrological and meteorological data and interpret the obtained results in accordance with the hydrogeological condition of the investigated area
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