Vol. 5, No 2, 2007 pp. 159 - 175
UDC 556.3(045)=111

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APPLICATION OF HYDRODYNAMICAL MODELS IN REDUCING THE INDETERMINACY
OF THE INPUT PARAMETERS FOR UNDERGROUND STREAMS SIMULATION
Duško Djurić
The Faculty of Technical Sciences of Novi Sad, Serbia

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Abstract. The key issue which arises during the preparation of the input data at modeling of all the hydraulic systems is the one of the sufficient and optimal number of input data. Here, the answer to the question has been found by using the existing research in this field, with the application of GROW software package which simulates the two-dimensional streaming of ground water in the aquifer strata. Thus, the subject of this paper is:
? Analysis of the required number of measuring points in order to reduce the indeterminacy down to the level where the further increase of the number of measuring points would not result in the higher quality.
? Analysis of the input data indeterminacy propagation through the simulation models.
The sample used for the analyses is a part of the water resource system in the aquifer of Semberija, Bosnia and Herzegovina, in the surrounding area of the town of Bijeljina. Apart from the separate analysis of aquifer as a source of groundwater, the paper specially addresses the analysis of the dominant influence of individual indeterminacies and potential for their reduction
Initially, the existing data were used, and then the additional existing and input data were collected, and afterwards the results were compared. Since each new quality piece of input data contribute to the reduction of the model and system indeterminacy, for the purpose of this study, the additional observations and field research were organized. On the basis of the additional measuring and observation, groundwater flow analysis model was calibrated.
Key words: indeterminacy of input data, ground water flow, numerical model, software package, groundwater, urban water.

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PRIMENA HIDRODINAMIČKIH MODELA U SMANJENJU NEODREĐENOSTI
ULAZNIH PARAMETARA ZA SIMULACIJU PODZEMNIH TOKOVA Ključno pitanje koje se nameće tokom pripreme ulaznih podataka kod modeliranja svih hidrotehničkih sistema je pitanje dovoljnog i optimalnog broja ulaznih podataka. Ovde je odgovor na postavljeno pitanje pronađen korišćenjem dosadašnjih rezultata istraživanja iz te oblasti uz primenu softverskog paketa GROW kojim se simulira dvodimenzionalno strujanje podzemne vode u vodonosnim slojevima – izdanima. Dakle, predmet ovog rada je:
? analiza potrebnog broja mernih mesta kako bi se neodređenost modela smanjila do nivoa kada se daljim povećanjem broja mernih mesta ne dobija veći kvalitet,
? analiza propagacije neodređenosti ulaznih podataka kroz simulacione modele.
Kao primer na kome su obavljene analize korišćen je deo složenog vodoprivrednog sistema u akviferu Semberije, u širem gradskom području Bijeljine. Pored klasične zasebne analize akvifera za zahvatanje podzemne vode, u radu se posebna pažnja obraća na analizu dominantnih uticaja pojedinih neodređenosti i mogućnosti njihovih smanjivanja.
U startu su iskorišćeni postojeći ulazni podaci, a zatim su prikupljeni dodatni postojeći ulazni podaci, da bi se potom izvršilo poređenje rezultata. Kako svaki novi kvalitetan ulazni podatak doprinosi određenom smanjenju neodređenosti modela i sistema, za potrebe ovog rada organizovana su dodatna osmatranja i terenski istražni radovi. Na bazi dodatnih merenja i osmatranja izvrešena je kalibracija modela za analizu strujanja podzemne vode.