You are here:
FATE AND EXPOSURE MODELING IN TERRESTRIAL ECOSYSTEMS: A PROCESS APPROACH
Citation:
Bird, S.L. FATE AND EXPOSURE MODELING IN TERRESTRIAL ECOSYSTEMS: A PROCESS APPROACH. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/232 (NTIS PB95138228), 1993.
Description:
Pathways for exposure of birds to pesticides include soil, water, air, soil-dwelling organisms, and insects. rocess approach to avian exposure calculates transport and transformation of agricultural chemicals through each of the exposure media. ifferential equations calculating the time rate of change of chemical in each exposure medium are solved in this approach. evelopment of terrestrial exposure algorithms at the United States Environmental Protection Agency (U.S. EPA), Environmental Research Laboratory, Athens, GA, draws on validated technology where wellestablished methodologies do not exist. ultimediak process models are data intensive. n integral part of developing a usable and useful exposure calculation framework is the incorporation of supporting databases in the system. upporting data for soils, meteorology, crops and cropping scenarios, and species distribution data are being developed on a regional scale based on the 186 major land resource areas (MLRA) defined by the United States Department of Agriculture (USDA). his chapter further describes the process-oriented, mechanistically based approach to avian exposure calculations, the supporting databases required for doing regional analyses, and the interactive system design for accessing this information.
