Long karst spring discharge time series and droughts occurrence in Southern Italy |
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Authors: | Francesco Fiorillo Francesco M Guadagno |
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Institution: | (1) Dipartimento di Scienze per la Biologia, Geologia e l’Ambiente, University of Sannio, Via dei Mulini 59/A, 82100 Benevento, Italy |
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Abstract: | A series of long karst spring discharges have been analysed to determine trends, fluctuations and relationship to rainfall.
Data come from aquifers in southern Italy, and in some cases cover more than one hundred years of records. Based on yearly
discharge data, hydrological series show the drop of the discharge after 1986, which has been interrupted by the recent wet
years of 2009 and 2010. This drop is connected to the decrease in annual rainfall, but other factors also seem to contribute
to this phenomenon. Based on monthly scale data series, the relationship between meteorological and hydrological droughts
has been analyzed, using the standard precipitation index (SPI). As karst systems are large reservoirs, only longer meteorological
droughts induce groundwater droughts, and the start, duration and time-lag of the hydrological droughts have been evaluated. |
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Keywords: | |
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