Discrete modeling of water and pesticide movement in soils was carried out assuming a pesticide-independent water movement. Water movement was described by lattice gas simulation of Darcy Flow with memory-free collisions. Pesticide advection, dispersion and sorption were described by the particle tracking method. Simulation results are in good agreement with results obtained by the commercially available programmes SWA CROP for water simulation and PESTLA for pesticide simulation. Efficiency of the discrete methods has been demonstrated by two-dimensional simulation of the influence of soil inhomogeneities and of spatially concentrated contaminations. Advantages and disadvantages of discrete algorithms compared to conventional, continuous methods depend on the structure and aim of simulation, e.g. lattice gas and particle tracking are especially suited for parallelization. (WEN)SIGLEAvailable from TIB Hannover: RR 6252(1997,1) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
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