Annualized Agricultural Non-Point Source model(AnnAGNPS)

a continuous-simulation

watershed-scale model

is widely used to evaluate non-point source pollution from agricultural watersheds in a number of countries.AnnAGNPS simulates surface water

sediment

nutrients

and pesticides leaving the cells and their transport through the watershed.The Daning river watershed was selected as the case study.Based on 3S(GIS

Remote Sensing

Global Position System) technology

the AnnAGNPS model database was set up in the watershed by analysis of rainfall characteristics

size of simulating cells

translation of soil relative parameters

characteristic of land use management

and so on.The parameters on climate

topography

soil

landuse

crop information and crop management were evaluated.This study was expected to provide a sound and credible basis for decisions to evaluate soil erosion

sediment and agricultural non-point source pollution in Daning river watershed and Three Gorges Reservoir Region.