engleski

Fluviokarst of Velebit Mt. (Croatia)

The origin and evolution of fluviokarst features on Velebit Mt. is conditioned by hydrogeological beds that build it. Since most of its structure is developed in permeable limestone beds fluviokarst forms are rare. Besides hydrogeological characteristics of the beds important role in their development has slope inclination. It determines the coefficient of surface runoff and therefore the amount of karst corrosion. Among fluviokarst forms ponors, blind valleys, dry and hanging valleys, canyons and poljes were mostly developed. A nice example of blind valley is one of Crbo vrilo creek (near Baške Oštarije). The specific relief form is valley of Bunovac on the NE slope of southern Velebit. It consists of two blind valleys formed at contact between Upper Triassic clastites and partially impermeable Ladinian limestones and dolomites. Fluviokarstic process has important role in development of speleological features. Combination of fluvial process and corrosion is well marked in the phreatic phase of speleogenesis when passages are fully filled by water of changeable level. According to their hydrogeological role speleological features of research area can be classified as percolating features, ponors and springs.

karstification; fluviokarst morphology; cave

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