engleski

Mean annual discharges in covered Croatian karst

The upstream part of the Kupa river basin and the basins of its main tributaries Gornja Dobra, Mrežnica and Korana is a karst area with similar main characteristics of runoff. It belongs to the upper basin of Danube in Croatia. The influential basin area of the Kupa river in the upper karstified part and of its tributaries is about 5, 000 km2, and the total mean discharge of water from that region is about 150 m3/s – which corresponds with the main specific inflow of 30 l/s/km2. In the paper, the results of the regional hydrological analysis for the mean annual discharges are presented. The available data of observations and measurements of hydrological parameters collected from 35 hydrological stations from 18 watercourses were used. The data analysed are from the period from 1951 to 2000. On the basis of the correlation analysis for the characteristic parameters of mean annual discharges, eight biparameter mathematical formulas having the coefficients r 0.90 were defined.

karst hydrology; regional hydrological analysis; discharge; Kupa basin; Croatia

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