Abstract
When using deterministic models of pesticides transport in the unsaturated (vadose) zone, one must deal with the complication of spatial variability of soil properties. A stochastic convection-dispersion model offers a solution to this problem. However, it has been observed that the dispersion coefficient exerts very little influence on the results of the model. The numerical simulations presented in this paper show that the stochastic convection model produces numerically equivalent results under most observed variable soil conditions. Hence, the dispersion coefficient does not appears as a significant parameter in the stochastic modeling of pesticide transport in the unsaturated zone at a field scale.
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