For one year we have been measuring level and temperature of underground water in Vetrovna jama, to find outthe origin of underground water and hydraulic characteristics of the cave and karst aquifer ...north east of Planinsko polje (karst of Notranjska region, central Slovenia). Similar parameters as in Vetrovna jama were measured also at the Unica River and at the Cerknica Lake. Cave is located only 2.7 km north from the polje and is fed by the Unica River, according to measurements. But in contrast with our expectations, we did not directly detect undergroundwater flow, which drains from the Cerknica Lake. Hydrographs measured in Vetrovna jama were compared with those measured in some other caves within the aquifer. Hydrographs from Vetrovna jama are only partly comparablewith hydrographs obtained in other monitored caves, as comparison shows no statistical significant correlation.Final conclusion would be that drainage of water between “eastern” and “western” part of karst aquifer islimited. More over, out flow from Vetrovna jama strongly depends on local hydrogeological restriction, such as supposedrockfall under Laška kukava collapse doline.
Underground karst water is accessible only in two caves near Logatec town (30 km south of Ljubljana, central Slovenia); Gradišnica and Gašpinova jama caves. Water level and water temperature were ...continuously measured more than one year in both caves. Gradišnica and Gašpinova jama caves belong to the same karst aquifer, therefore fluctuations of water level are almost identical and simultaneous.According to our measurements,fluctuations are significant;they rach at least 50 m.Incontrast,water temperature is significantly different at both locations.Mean difference is 1-2 °C, the highest measured was 5 °C. Relatively high temperature differences are due to recharge characteristics of the aquifer. It is fed by waters which have different surface origin. Water temperature in Gradišnica Cave directly reflects temperatureof the surface Unica River at medium water condition. On the contrary, the Unica River influences on water temperature in Gašpinova jama Cave at the highest floods only.Ithappens when discharge of the surface Unica River at Haasberg exceeds 40 m3/s. Water temperature becomes similarin larger part of the aquifer between both discussed caves, at such high water conditions only. Temperature of underground water tells us much about the origin of the water, which feeds discussed caves.
Underground karst water is accessible only in two caves near Logatec town (30 km south of Ljubljana, central Slovenia); Gradišnica and Gašpinova jama caves. Water level and water temperature were ...continuously measured more than one year in both caves. Gradišnica and Gašpinova jama caves belong to the same karst aquifer, therefore fluctuations of water level are almost identical and simultaneous.According to our measurements,fluctuations are significant;they rach at least 50 m.Incontrast,water temperature is significantly different at both locations.Mean difference is 1-2 °C, the highest measured was 5 °C. Relatively high temperature differences are due to recharge characteristics of the aquifer. It is fed by waters which have different surface origin. Water temperature in Gradišnica Cave directly reflects temperatureof the surface Unica River at medium water condition. On the contrary, the Unica River influences on water temperature in Gašpinova jama Cave at the highest floods only.Ithappens when discharge of the surface Unica River at Haasberg exceeds 40 m3/s. Water temperature becomes similarin larger part of the aquifer between both discussed caves, at such high water conditions only. Temperature of underground water tells us much about the origin of the water, which feeds discussed caves.
For one year we have been measuring level and temperature of underground water in Vetrovna jama, to find outthe origin of underground water and hydraulic characteristics of the cave and karst aquifer ...north east of Planinsko polje (karst of Notranjska region, central Slovenia). Similar parameters as in Vetrovna jama were measured also at the Unica River and at the Cerknica Lake. Cave is located only 2.7 km north from the polje and is fed by the Unica River, according to measurements. But in contrast with our expectations, we did not directly detect undergroundwater flow, which drains from the Cerknica Lake. Hydrographs measured in Vetrovna jama were compared with those measured in some other caves within the aquifer. Hydrographs from Vetrovna jama are only partly comparablewith hydrographs obtained in other monitored caves, as comparison shows no statistical significant correlation.Final conclusion would be that drainage of water between “eastern” and “western” part of karst aquifer islimited. More over, out flow from Vetrovna jama strongly depends on local hydrogeological restriction, such as supposedrockfall under Laška kukava collapse doline.
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