| Popis: |
A modeling tool that utilizes a raster-based geographic information system to build an input file for the spatially distributed pollutant runoff model, AGNPS, was developed as a component of the WATERSHEDSS decision support system. In addition to automatically computing input data from basic soils, topography, and land use maps, this modeling tool adds the capability to input point source, channel characteristic, and pesticide application data for userselected areas in the watershed. The tool was used to simulate runoff and sediment, nitrogen, and phosphorus loads for a small gaged watershed located in North Carolina. Output from the tool was compared to observed runoff and pollutant loads for 11 storms. Statistical comparisons between observed and model-simulated loads at two monitoring stations showed no significant difference between observed and predicted runoff volumes and nitrogen, phosphorus, and sediment loads, indicating that the modeling tool provides reasonable estimates of pollutant loads from storm events. |
