Evaluation of a quantitative phosphorus transport model for potential improvement of southern phosphorus indices
Forsberg, Thomas Adam
MetadataShow full item record
Management of agricultural nonpoint source phosphorus (P) requires identification of fields susceptible to P loss. P-Indices are the most common tools used to identify critical source areas of P loss. However, the success of the P-Index is impeded by insufficient testing against measured P loss data. Due to a shortage of available P loss data sets, simulated data from a quantitative P transport model may be used to test against a P-Index. The objective of this study was to compare predictions from the Texas Best Management Evaluation Tool (TBET) against measured P loss data to determine whether the model can improve P-Indices in the South. Measured P loss data, representing a range of conditions, were used to test TBET on an event-basis. Our results suggest that TBET can generate satisfactory quantitative predictions of runoff, sediment and P loss with site-specific calibration, but may be better suited for parameterization by physiographic region or state.