 |
| Titel |
Modelling cave flow hydraulics in the Notranjski Kras, Slovenia |
| VerfasserIn |
Georg Kaufmann, Franci Gabrovšek |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103538
|
| Publikation (Nr.) |
 EGU/EGU2015-2951.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Notranjski Kras region is a karst region in western Slovenia, developed in Cretaceous
limestone. The region is characterised by hilly relief, with peaks reaching 1300Âm elevation.
Several well-developed cave systems drain the karst aquifer, providing preferential
flow pathes along two sections: The Pivka River, which sinks into Postojnska Jama
and reappears in Planinska Jama, and the Stržen and CerknišÄica rivers, which
sink into Karlovica Jama, flow through Zelške Jama and Tkalca Jama and also
reappear in Planinska Jama. Both sub-surface flow pathes merge in Planinska Jama,
providing water for the Unica river. The Unica river leaves Planinska Jama via a large
karst srping and passes through Planinsko Polje, disappearing again through two
groups of ponors, finally emerging in the Ljubljanka Springs at around 300Âm
asl.
The sub-surface flow path through the Postojnska Jama cave system has been monitored
with 7 stations distributed along the flow path, monitoring stage and temperature. We
have used the stage data to model flow through the cave system with the program
package SWMM, simulating the active parts of Postojnska Jama with simplified
geometry.
From the comparison of stage observations and predictions, we identified key sections in
the cave, which control the sub-surface flow, such as passage constrictions, sumps and
by-passes. Using a formal inverse procedure, we determined the geometry of this key sections
by fitting predicted to observed stages, and we achieved a very high degree of correlation. |
|
|
|
|
|
|