engleski

Bacis morphogenetic characteristics of caves in the Grabovac valley (Slunj, Croatia)

The explored area is about 4 km east of Slunj town at the region known as Kordun Karst. This location stipulated the specific condition for the formation of the speleological objects in the south area of Grabovac Valley. The Grabovac Stream flows from the norlh to the south through the Grabovac Valley connected to the canyon of the river Korana. Partially the Grabovac Stream flows underground. In this area in the period of years 2000 and 2001 a member of Speleological society Karlovac (Karlovac, Croatia) explored three caves. The biggest is Ponor pod Kremenom Cave with totallength of the channel s of 1019 m. The underground pari of the Grabovac Stream flows through its channels. In the south of the dry parI of the valley there"are two caves: Gornja Barićeva (260 m long) and Donja Barićeva (26 m long). Morphological characteristics indicate the dynamics of the formation of the cave system under the influence of the allogenic water. They are the result of the corrosion and erosion caused by the water of the underground parI of Grabovac Stream during several phases. These tree caves are parts of one system in sen se of speleogenesis. Six basic phases of the formation of the speleological objects can be established. The aim of this paper is to give the basic theses about the morphogenesis of these caves, particularly in relation to their geomorphological position.

speleology; geomorphology; morphogenesis; caves; contact karst; allogenic water; Slunj karst plateau; Croatia

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