engleski

A Few Hydrological analysis of high waters of Kopački rit

Kopački rit Nature Park is one of the largest natural marshlands in Europe, situated in the north-eastern part of Croatia between the Danube and the river of Drava, upstream from the mouth of Drava. The area is protected by the Ramsar Convention (1993) as an internationally important flood area and nominated by UNESCO as the World Natural Heritage. The basic ecological feature of Kopacki rit is given by the flood-dynamics so that the landscape of the whole region depends on the flood intensity. The parts of the swamp land and water are arranged in the form of a mosaic that changes the size, shape and function. The changes depend on the quantity of the raised water entering for the major part from the Danube River and for the minor part from the Drava River. Both the impact of floods on the ecological features of Kopački rit and the flood regime have been insufficiently examined so far. Only recently the significance and the need for the research of Kopački Rit’ s hydrological regime has been pointed out, which would serve as a comprehensive foundation for establishing ecological features and rule book that would enable the management of the whole protected area. The paper presents a preliminary hydrological analysis stretching over three year period from 2001 to 2003 in which the data on water levels and discharges were collected. The data were taken over from various sources, and measurements were carried out at different locations and collected from different monitors. Therefore, the paper points at the procedures of integration and matching of the acquired data, and extending the needed information by correlative analysis. The records of Danube’ s twenty major water waves (high water levels and corresponding discharges) were taken from the three year research and focused on to explain the impact of Danube on the Kopački rit’ s waters. The analysis enabled determining the features of filling and emptying of Kopački rit and establishing the high correlative connection between Kopački lake’ s water level and Danube’ s water level at Vukovar. To determine the interrelation between the water condition at Kopački rit and riverbeds’ waters of Danube and Drava seven important water waves (the highest water levels and discharges) were separated and analysed from the monitored three year period. Therefore, correlative analyses of Kopački lake water level and the water levels of the surrounding water gauging stations on the Danube and Drava were conducted. The analysis showed a firm correlative connection between Kopački rit’ s water levels and Danube’ s water levels, whereas the correlative connection at Drava’ s water levels is hardly marked. Eventually, the paper points at some water balance indicators.

hydrological analyse; Kopački rit; corresponding water levels; correlative relationship

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