Data analysis coming from Classical karst groundwater monitoring network highlights the complex circulation of the hydrostructure. Only the collaboration between Italy and Slovenia could lead, trough a reasoned groundwater monitoring network, to plan the best transboundary aquifer management and protection. The monitoring stations are 14: Timavo, Filtri, Doberdò and Sardos Springs, Colombi, Comarie, Lindner, Giant, Massimo, Jerko, Trebiciano, Kanjaducah, Kacna, Škocjan caves. The Mathematics and Geosciences Department of Trieste University is monitoring all the water points since 1995 in cooperation with slovenian partners (Park Škocjanske Jame and ZRCSAZU). The network permits to highlight the contribution to the flow from the different parts of the hydrostructure. During the flood the flow is conditioned by the Reka river regime while, during low-water, the circulation is more influenced by the infiltration due to the rainfall and from the Isonzo river contribution. The circuit connecting Škocjan cave with Timavo springs is characterized by a series of large pipes that allow the flood impulse transfer within 1 to 3 days. The monitoring carried out showed that during the floods the most part of the circuits are under pressure and only a comparative analysis of levels, temperature and conductivity permits to correctly evaluate the water transit times. Infact, if the rising water level in the caves is simultaneous due to the increasing hydraulic load upstream, the changes in conductivity and temperature are different from site to site and allow to intercept the incoming flooding water and to estimate correctly the water velocity propagation. Different is the behaviour in the north-western sector where the circulation is dispersed and base flows are underlined. In this case, the beginning of the floods is often delayed compared to the springs outflow and it is partially due to the stop up water coming from the Reka – Timavo circuit.

Groundwater monitoring network in the classical Karst (NE Italy, SW Slovenia)

ZINI, Luca;CALLIGARIS, CHIARA;CUCCHI, FRANCO
2013

Abstract

Data analysis coming from Classical karst groundwater monitoring network highlights the complex circulation of the hydrostructure. Only the collaboration between Italy and Slovenia could lead, trough a reasoned groundwater monitoring network, to plan the best transboundary aquifer management and protection. The monitoring stations are 14: Timavo, Filtri, Doberdò and Sardos Springs, Colombi, Comarie, Lindner, Giant, Massimo, Jerko, Trebiciano, Kanjaducah, Kacna, Škocjan caves. The Mathematics and Geosciences Department of Trieste University is monitoring all the water points since 1995 in cooperation with slovenian partners (Park Škocjanske Jame and ZRCSAZU). The network permits to highlight the contribution to the flow from the different parts of the hydrostructure. During the flood the flow is conditioned by the Reka river regime while, during low-water, the circulation is more influenced by the infiltration due to the rainfall and from the Isonzo river contribution. The circuit connecting Škocjan cave with Timavo springs is characterized by a series of large pipes that allow the flood impulse transfer within 1 to 3 days. The monitoring carried out showed that during the floods the most part of the circuits are under pressure and only a comparative analysis of levels, temperature and conductivity permits to correctly evaluate the water transit times. Infact, if the rising water level in the caves is simultaneous due to the increasing hydraulic load upstream, the changes in conductivity and temperature are different from site to site and allow to intercept the incoming flooding water and to estimate correctly the water velocity propagation. Different is the behaviour in the north-western sector where the circulation is dispersed and base flows are underlined. In this case, the beginning of the floods is often delayed compared to the springs outflow and it is partially due to the stop up water coming from the Reka – Timavo circuit.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2705037
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