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PRZM-2, A MODEL FOR PREDICTING PESTICIDE FATE IN THE CROP ROOT AND UNSATURATED SOIL ZONES: USERS MANUAL FOR RELEASE 2.0
Citation:
Mullins, J., R. Carsel, J. Scarbrough, AND A. Ivery. PRZM-2, A MODEL FOR PREDICTING PESTICIDE FATE IN THE CROP ROOT AND UNSATURATED SOIL ZONES: USERS MANUAL FOR RELEASE 2.0. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/046.
Description:
PRZM-2 links two subordinate models--PRZM and VADOFT--in order to predict pesticide transport and transformation down through the crop root and unsaturated zones. RZM is a one-dimensional, finite difference model that accounts for pesticide fate in the crop root zone. his release of PRZM-2 incorporated several features in addition to those simulated in the original PRZM code--specifically oil temperature simulation, volatilization and vapor phase transport in soils, irrigation simulation, microbial transformation, and a method of characteristics algorithm to eliminate the numerical dispersion. RZM is now capable of simulating transport and transformation of the parent compound and as many as two daughter species. ADOFT is a one-dimensional, finite element code that solves the Richard's equation for flow in the saturated zone. he user may make use of constitutive relationships between pressure, water content, and hydraulic conductivity to solve the flow equations. ADOFT may also simulate the fate of two parent and two daughter products. he PRZM and VADOFT codes are linked together with the aid of a flexible execution supervisor that allows the user to build loading models that are tailored to site-specific situations. n order to perform probability-based exposure assessments, the code is also equipped with a Monte Carlo pre- and post-processor.