Unsaturated zone modeling pesticide movement

Unsaturated Zone Models. Various models exist for estimating the movement and degradation of pesticide residues in the unsaturated zone (20). Perhaps the best model available is PRZM developed by the U.S. EPA (21). The applicability of PRZM to the modeling of aldicarb residues has been demonstrated using data from Long Island (22), Florida (20), Wisconsin (23.23.24), and North Carolina (24). 

Principles of Modeling Pesticide Movement in the Unsaturated Zone... 

Green, R.E. Liu, C.C.K. Tamraker, N. "Modeling Pesticide Movement in the Unsaturated Zone in Hawaii Soils Under Agricultural Use", 189th American Chemical Society National Meeting, PEST 54, Florida, 1985. 

PRZM-2 Unsaturated zone/groundwater PRZM-2 is a combination of two models developed to simulate the one-dimensional movement of pesticides. It has been used predominantly for evaluation of pesticides in the root zone. 

Saturated Zone Models. Results from unsaturated zone simulations can be used as inputs to saturated zone models to predict concentrations of aldicarb residues in groundwater. The saturated zone model used by the author takes the pesticide inputs into groundwater, as predicted by PRZM, and calculates the concentration and movement of aldicarb residues in the upper portion of the saturated zone. The core of the saturated zone model is a finite element solute transport calculation procedure developed at the University of Wisconsin (25). The accuracy of this model in estimating pesticide movement in groundwater is (as with other... 

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