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Metka Petric, 2002
Characteristics of Recharge-Discharge Relations in Karst Aquifer

Zalozba ZRC Publications, Carsologica Series
Paperback, 154 pages, 170 x 240 mm.

Price : 17.– CHF; 12.50 Euro
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The book brings the analysis of relations between recharge and discharge of karst aquifers, i.e. input and output functions of karst system, which can be applied in order to define the characteristics of its functioning. Three different recharge-discharge models were set up.

In the first one the measured precipitation and in the second the effective infiltration were used as the input component. In the third model also characteristics of the sub-system of unsaturated zone and the temporal distribution of the recharge in fast and slow component were taken into account. The functioning within the system was expressed by the transfer function between the input and the output signal, and the adequacy of individual models was evaluated according to the accuracy of the simulation, which is related to the transfer function’s ability to reproduce discharges, on the basis of which it was determined. The improvement in the model’s results, brought about by the introduction of the effective infiltration function instead of the precipitation, highlighted the significant influence exerted by the vegetation and processes in air and in the soil on the quantity and the temporal distribution of actually infiltrated water. The best results of the third model could be related to the existence of the certain mechanism that enables rapid entrance of the infiltrated precipitation water into karst drainage network and brings about as its consequence a typical reaction of karst springs, i.e. their rapid and intensively increased discharge. On the other hand, such mechanism enables a part of infiltrated precipitation to be temporarily stored during high waters and subsequently sustains the slower emptying of the aquifer also in period of low waters. We talk about specific hydrodynamic function of epikarst which, due to its typical structure, influences the temporal distribution of recharge.