MODELIRANJE PLAVLJENJA DIONICE RIJEKE VUKE UZVODNO OD UŠĆA U DUNAV

In this paper, a section of the Vuka River from its confluence with the Danube River in Vukovar to 3 + 630 rkm was modeled. The possibility and size of floods in the surrounding area were analyzed for different return periods (2, 5, 10, 50, and 100 yrs). Although the high-water levels of the Danube River are lower than the terrain elevation of Vukovar, they cause backwater in the Vuka River and in its tributary, the Bobotski canal. In that indirect way, the surrounding area is endangered and the efficiency of drainage systems is reduced. The existing riverbed of the analyzed Vuka River section was digitalized based on a digital terrain model using the geographic information system (GIS) software ArcGIS and the HEC-GeoRAS toolbar. A mathematical model of the steady-state flow of the Vuka river section using the digitized riverbed was executed in the HEC-RAS software using different return periods. The obtained velocities and water levels were analyzed using HEC-RAS, and the sizes of the flooded areas were calculated and observed in ArcGIS.U radu je modelirana dionica rijeke Vuke od samog ušća u Dunav u Vukovaru do 3+630 rkm, pri čemu je analizirana mogućnost pojave poplava, uzimajući u obzir povratna razdoblja od 2, 5, 10, 50 i 100 godina. Iako maksimalni vodostaji rijeke Dunav ne premašuju kote, uglavnom, nizinskog terena područja grada Vukovara, uzrokuju uspore u rijeci Vuki i njezinom pritoku Bobotskom kanalu. Na taj, indirektan način, ugrožavaju okolno područje i smanjuju učinkovitost zaobalnih sustava površinske odvodnje. Na digitalnom modelu terena korita rijeke Vuke i inundacijskog područja, u GIS računalnom programu ArcGIS pomoću alatne trake HEC-GeoRAS, digitalizirano je postojeće korito rijeke Vuke. Na tako definiranoj dionici napravljen je matematički model stacionarnog strujanja u računalnom programu HEC-RAS prema različitim povratnim razdobljima. Dobivene brzine strujanja i vodostaji analizirani su u samom programu HEC-RAS, dok se veličina poplavnih područja analizirala u ArcGIS-u