• computations for the concentration of pollution in water-courses without or with curvatures
• approximating the curves by polygonal lines
• allowing variable width and depth in the model 

• Transport equation with boundary conditions
• mathematical model: a specific partial differential equation in two dimensions
• boundary condition: depends on the polluting source and the geometrical data of the line of river shore
• Reflection principle
• reflection of pollutants from the river shore is taken into consideration
• the concentration is computed as a sum (using only the dominant members)
• Application of a curve (bent) coordinate system
• the curvature of the middle line of the river is replaced by a polygon
• Visualization of the pollutants on a map
• colouring the map according to the concentration values

• Settings
• factor of transversal dispersion
• geometrical data of the water-course
• location of polluting sources
• Characteristics of pollutants
• intensity of polluting sources
• loading and pollution limits
• Other parameters
• size of the map (number of pixels) 
• connection between pixels and true sizes

• WINDOWS

• Katalin Balla, Gerzson Kéri, Endre Németh, Tamás Rapcsák, Zoltán Sági, Tamás Tóth and Zoltán Verrasztó: Multiattribute decision making for analysing the water quality of the Danube branch at Ráckeve-Soroksár (in Hungarian), Szigma 30(1999)135-159.

• Chamber of Commerce and Industry of Pest County: Computer modelling of the water supply system of the river branch of the Danube at Ráckeve-Soroksár, by using multi-attribute decision methods (1998)

János Fülöp, Room L511.
Research Group of Operations Research and Decision Systems
e-mail:
phone: (36-1) 279-6112, fax: (36-1) 209-5267