Abstract
ABSTRACT: A UNIX‐based windows application was developed to integrate a phosphorus transport model with the Geographic Resources Analysis Support System (GRASS). The system prioritizes potential phosphorus loading from fields or cells in a watershed and can evaluate the effects of alternate management practices on phosphorus yield. The model simulates phosphorus loading by using a daily mass balance on a unit‐area basis and incorporates the effects from rainfall, topography, soil properties, fertilizer and animal waste application, and management. Model predictions include dissolved and sediment‐bound phosphorus yield, runoff volume, and sediment yield. Within the integrated GRASS‐modeling system, the user can obtain model input data, execute the model using various options, rank model input and out. put data, and display them as GRASS‐based maps or data tables. All functions are menu driven, developed using C language and X‐window tools to run on a SUN workstation platform. The system provides a powerful and efficient tool for prioritizing phosphorus loading from nonpoint sources.
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