A Magyar Hidrológiai Társaság XXIX. Országos Vándorgyűlése (Eger, 2011. július 6-8.)

14. szekció: A Duna hordalékviszonyai - Spasojevic, Miodrag (Újvidéki Egyetem Szabadkai Építőmérnök Kara): Mathematical Modeling of Flow, Sediment Transport, and Bed Evolution in Alluvial Rivers

MATHEMATICAL MODELING OF FLOW, SEDIMENT TRANSPORT, AND BED EVOLUTION IN ALLUVIAL RIVERS Modeling approach adopted for the DANUBE EHT 2010 HungarySerbia IPA project Miodrag Spasojević Professor, University of Novi Sad, Civil Engineering Faculty Subotica, Kozaračka 2a, 24000 Subotica, Serbia, mspasojevic@gf.uns.ac.rs ABSTRACT The paper presents a comprehensive conceptual approach to 3-, 2-, and 1-D mathematical modeling of flow, sediment transport and bed evolution in natural watercoursed (alluvial rivers) with sediment mixtures. The sediment domain is divided into subdomains for suspended sediment, active-layer sediment, and subsurface-strata sediment. Governing sediment equations are defined for each subdomain, including sediment exchange mechanisms between suspended sediment and active-layer sediment, as well as activelayer and subsurface sediment. The sediment mixture is represented through a suitable number of sediment size classes, and governing-equations’ terms are defined as size-class specific. Governing sediment equations are complemented with an appropriate set of governing unsteady flow equations. The second part of the paper focusses on several example applications, including 3-, 2-, and 1-D study cases, as well as comparison of modeling results and results of field data measurements. Keywords: Fluvial hydraulics, mathematical modeling, flow, sediment transport, bed evolution, sediment mixtures