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| Titel |
Karst aquifers recharge and its relation with flood formation in the Vipava/Vipacco basin |
| VerfasserIn |
Paolo Caronna, Simon Rusjan, Stefano Barontini, Giovanna Grossi, Mitja Brilly, Roberto Ranzi |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250082612
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| Zusammenfassung |
| In karst basins a strong mutual interaction between streamflow and groundwater is often
observed and can affect flood formation and runoff propagation. Aiming at characterising the
runoff regime of the transnational Vipava/Vipacco karst basin (650km2, Eastern Alps,
SLO/I), which is a case study of the FP7 KULTURisk research project, the natural
groundwater recharge was investigated. The Vipava/Vipacco river is a left tributary of the
SoÄa/Isonzo river, and its main course is 50km long. A large amount of data, provided by the
Alto Adriatico Water Authority and by the Slovenian Environment Agency was collected,
including time series from 7 stream gauges, 10 groundwater level measurement
station and 9 rain gauges. Data covers a time period lasting since 1948 until 2011.
Groundwater level data are available at a daily scale, and runoff and precipitation
time–series are available both at daily and, for some stations, at hourly scale. An indirect
approach, based on the stochastic univariate and multivariate correlation between
groundwater levels, precipitation and hydrometric time series was adopted. It allowed to
evaluate the characteristics of the groundwater recharge, due both to infiltration and to
percolation from the stream channel, and its effect on the baseflow. As the hydrological
response of a karst aquifer to an intense precipitation is strongly characterised by its
initial conditions, a more detailed analysis was conducted for the most relevant
flood events since 1998, in order to study the groundwater feedback to a severe
water input in areas close to the stream channel. Considering flood events, it also
allowed to neglect the evapotranspiration, and to estimate the basin infiltration. This
section of the study is preliminar to model the basin in view of predicting flood
events. |
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