Modelling Flow of Subterranean Pivka River in Postojnska Jama, Slovenia Modeliranje Toka Podzemeljske Pivke V Postojnski Jami, Slovenija
COBISS: 1.02 Modelling floW of subterranean Pivka river in Postojnska jama, Slovenia Modeliranje toka podzemeljske Pivke V Postojnski jami, Slovenija Georg Kaufmann1, Franci Gabrovšek2 & Janez TURK3 Abstract UDC 556.32:551.44(497.471) Izvleček UDK 556.32:551.44(497.471) Georg Kaufmann, Franci Gabrovšek, Janez Turk: Modelling Georg Kaufmann, Franci Gabrovšek, Janez Turk: Modeliranje cave flow hydraulics in Postojnska jama, Slovenia toka podzemeljske Pivke v Postojnski jami, Slovenija The sub-surface flow path through the Postojnska jama cave Z avtomatskimi merilniki in registratorji podatkov smo sprem- system has been monitored with 7 stations distributed along ljali podzemni tok Pivke v Postojnski jami na sedmih točkah the flow path, monitoring stage and temperature.W e have used med ponorom in odtočnim sifonom v Pivki jami. Podatke the stage data to model flow through the cave system with the nivojev in pretoka smo obravnavali z modelom EPA SWMM, program package SWMM, simulating the active parts of Pos- s katerim smo simulirali tok v poenostavljeni geometriji ka- tojnska jama with simplified geometry. From the comparison nalov. S primerjavo med opazovanji in modelskimi rezultati of stage observations and predictions, we identified key sec- smo določili ključne odseke (podore, zožitve, sifone, obtoke), tions in the cave, which control the sub-surface flow, such as ki najbolj vplivajo na dinamiko toka podzemne Pivke. Glavne passage constrictions, sumps and by-passes. Using a formal parametre teh odsekov smo določili z inverzno metodo, ki te- inverse procedure, we determined the geometry of this key sec- melji na algoritmu soseske (Neighbourhood algorithm, NA) in tions by fitting predicted to observed stages, and we achieved a pri tem dobili odlično ujemanje med modelom in podatki.
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