Pesticide runoff model (PeRM): an integrated modeling system for simulation of pesticide runoff losses from agricultural lands

摘要

An integrated model, the Pesticide Runoff Model (PeRM), has been developed to predict runoff losses of pesticides from agricultural lands. The model is an integration of a mathematical model, a relational database system, and a Geographic Information System. Information of soil type, land use, land slope, watershed boundaries, precipitation, pesticide usage, as well as physical and chemical properties of pesticides have been digitized and gridded by using GIS, managed within database, and ready for use by the mathematical model. The developed modeling system has been used to calculate the losses of atrazine from agricultural lands in Kintore Creek Watershed, Ontario, Canada between 1988 and 1992. The modeling outputs have been verified by using monitoring data, which obtained from a water quality monitoring project carried out in the same watershed and the same period of time. The result indicated that the model provides an effective means for forecasting the pesticide runoff from agriculture lands.